An update seemingly broke MST and multiple monitor daisy chaining for Dell XPS 15 7590 and NVIDIA 1650

[phodamentals]

Distribution (run cat /etc/os-release):

 Static hostname: popos
       Icon name: computer-laptop
         Chassis: laptop
      Machine ID: 1e6fdc806af689190ad6d8f55e6d4c06
         Boot ID: 4937464a606148438d4fecc7ee76de5c
Operating System: Pop!_OS 22.04 LTS               
          Kernel: Linux 5.19.0-76051900-generic
    Architecture: x86-64
 Hardware Vendor: Dell Inc.
  Hardware Model: XPS 15 7590

Related Application and/or Package Version (run apt policy $PACKAGE NAME):
N/A

Issue/Bug Description:
I have been using multi monitor support with display port MST "daisy chaining" for almost 3 years now with my XPS 15 7590 and have been pleasantly impressed how easy it was to configure unlike back in the olden days.

However, I believe that a recent update has since broken the functionality. I can only enable the internal laptop display plus 2 of the 3 external monitors. I even resorted to dusting off my xrandr skills and tried various configurations/scripting, however none of which will force my eDP-1 to turn off according to xrandr -q.

Steps to reproduce (if you know):

• Plug USB-C to Display Port cable to Monitor 1 (MST), DP out to Monitor 2 (MST on), DP out to Monitor 3 (MST off), attempt to disable internal laptop display
• Attempt to force enable Monitor 3, but after applying changes, 3rd monitor disappears from 'Displays' configuration.
• Attempt to create custom xrandr script.
• Attempt to do a clean roll-back to earlier NVIDIA driver versions (510 and 470) but yielded same results

Expected behavior:

• All 3 external daisy-chained MST monitors to be joined and internal display to be truly shut off when cable is connected.

Other Notes:

xrandr -q
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   3840x2160     60.00 +  59.98    59.97  
   3200x1800     59.96    59.94  
   2880x1620     59.96    59.97  
   2560x1600     59.99    59.97  
   2560x1440     59.99    59.99    59.96    59.95  
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     59.99    59.98    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     60.01*   59.97    59.96    59.93  
   1600x1200     60.00  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-1-8 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  50.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-1-8 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  50.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-1-1-1 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  50.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  

nvidia-smi
Wed Sep 28 18:41:09 2022       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 515.65.01    Driver Version: 515.65.01    CUDA Version: 11.7     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA GeForce ...  Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   49C    P3     3W /  N/A |      4MiB /  4096MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      4785      G   /usr/lib/xorg/Xorg                  4MiB |
+-----------------------------------------------------------------------------+

[phodamentals]

Has anyone else experienced this recently?

[DenNV]

The same true for me

root@Thinkpad-T14s:~# xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm
1920x1080 60.00*+
1680x1050 60.00
1280x1024 60.00
1440x900 60.00
1280x800 60.00
1280x720 60.00
1024x768 60.00
800x600 60.00
640x480 60.00
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 connected (normal left inverted right x axis y axis)
1920x1080 60.00 +
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
DisplayPort-3 connected (normal left inverted right x axis y axis)
1920x1080 60.00 +
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08

OS: Pop!_OS 22.04 LTS x86_64
Host: 20UH001ART ThinkPad T14s Gen 1
Kernel: 6.0.2-76060002-generic

With kernel 6.0.2-76060002 works only one external from 2 monitors connected in daisy chain, despite showing that 3 connected and active (including laptop's embedded).

[leviport]

I wonder if this and pop-os/linux#187 are related? I'm doing some testing today with the 6.0.6 kernel update to see if I can figure out what's causing that to happen on our kernel. Interestingly, the mainline Ubuntu kernel doesn't have the same bug. Hopefully that means there is only a small number of things to check for.

[DenNV]

I wonder if this and pop-os/linux#187 are related? I'm doing some testing today with the 6.0.6 kernel update to see if I can figure out what's causing that to happen on our kernel. Interestingly, the mainline Ubuntu kernel doesn't have the same bug. Hopefully that means there is only a small number of things to check for.

yes, this is exactly situation I have.

[phodamentals]

I had upgraded to kernel 6.0.6-76060006-generic and kept nvidia driver version 515.65.01 to see if there'd be any changes, but still has the same behavior: Displayport MST daisy-chaining does 'activate' 3 external monitors, but just two are on and operating as reported previously above. So for the time being, I've been using an extra HDMI cable for the third monitor since the time of my original post, but ideally I'd like to simply use the single USB-C cable like I had before for so long.

[frezbo]

I have a similar problem, had two external monitors connected via USB C and the second monitor connected to the DP out of the first one. This seemingly broke with some kernel update (I was traveling and came back to find the issue).

The monitors gets detected during the system boot and when system asks for the decryption password and also at the login screen. After logging into PoP! OS both the external displays go blank and shows no signal detected, but the displays option in settings do show the extra monitors. Trying to change the resolution at times might trigger the external monitors to work. I have tried a live PoP OS and the external displays work fine in live mode. So I'd assume this has to do with some process/something that;s specific to PoP OS login process.

[frezbo]

I have a similar problem, had two external monitors connected via USB C and the second monitor connected to the DP out of the first one. This seemingly broke with some kernel update (I was traveling and came back to find the issue).

The monitors gets detected during the system boot and when system asks for the decryption password and also at the login screen. After logging into PoP! OS both the external displays go blank and shows no signal detected, but the displays option in settings do show the extra monitors. Trying to change the resolution at times might trigger the external monitors to work. I have tried a live PoP OS and the external displays work fine in live mode. So I'd assume this has to do with some process/something that;s specific to PoP OS login process.

Providing more info:

❯ uname -a
Linux deepwater 6.0.6-76060006-generic #202210290932~1667401208~22.04~d2df702 SMP PREEMPT_DYNAMIC Wed N x86_64 x86_64 x86_64 GNU/Linux

❯ xrandr --verbose
Screen 0: minimum 320 x 200, current 5760 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+0+0 (0x59) normal (normal left inverted right x axis y axis) 309mm x 173mm
	Identifier: 0x52
	Timestamp:  792916
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       0
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	_MUTTER_PRESENTATION_OUTPUT: 0 
	EDID: 
		00ffffffffffff000dae0a1400000000
		291d0104a51f11780328659759548e27
		1e505400000001010101010101010101
		010101010101363680a0703820403020
		a60035ad10000018000000fe004e3134
		304843412d4541450a20000000fe0043
		4d4e0a202020202020202020000000fe
		004e3134304843412d4541450a200002
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
		0 1 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	vrr_capable: 0 
		range: (0, 1)
	abm level: 0 
		range: (0, 4)
	max bpc: 16 
		range: (8, 16)
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 78 
		supported: 78
	non-desktop: 0 
		range: (0, 1)
  1920x1080 (0x59) 138.780MHz -HSync -VSync *current +preferred
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height 1080 start 1090 end 1096 total 1112           clock  60.00Hz
  1680x1050 (0x5a) 138.780MHz -HSync -VSync
        h: width  1680 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height 1050 start 1090 end 1096 total 1112           clock  60.00Hz
  1280x1024 (0x5b) 138.780MHz -HSync -VSync
        h: width  1280 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height 1024 start 1090 end 1096 total 1112           clock  60.00Hz
  1440x900 (0x5c) 138.780MHz -HSync -VSync
        h: width  1440 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height  900 start 1090 end 1096 total 1112           clock  60.00Hz
  1280x800 (0x5d) 138.780MHz -HSync -VSync
        h: width  1280 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height  800 start 1090 end 1096 total 1112           clock  60.00Hz
  1280x720 (0x5e) 138.780MHz -HSync -VSync
        h: width  1280 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height  720 start 1090 end 1096 total 1112           clock  60.00Hz
  1024x768 (0x5f) 138.780MHz -HSync -VSync
        h: width  1024 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height  768 start 1090 end 1096 total 1112           clock  60.00Hz
  800x600 (0x60) 138.780MHz -HSync -VSync
        h: width   800 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height  600 start 1090 end 1096 total 1112           clock  60.00Hz
  640x480 (0x61) 138.780MHz -HSync -VSync
        h: width   640 start 1968 end 2000 total 2080 skew    0 clock  66.72KHz
        v: height  480 start 1090 end 1096 total 1112           clock  60.00Hz
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x53
	Timestamp:  792916
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	vrr_capable: 0 
		range: (0, 1)
	max bpc: 8 
		range: (8, 16)
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 85 
		supported: 85
	non-desktop: 0 
		range: (0, 1)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x54
	Timestamp:  792916
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	subconnector: Unknown 
		supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	vrr_capable: 0 
		range: (0, 1)
	max bpc: 8 
		range: (8, 16)
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 89 
		supported: 89
	non-desktop: 0 
		range: (0, 1)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x55
	Timestamp:  792916
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	subconnector: Unknown 
		supported: Unknown, VGA, DVI-D, HDMI, DP, Wireless, Native
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	vrr_capable: 0 
		range: (0, 1)
	max bpc: 8 
		range: (8, 16)
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 95 
		supported: 95
	non-desktop: 0 
		range: (0, 1)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x56
	Timestamp:  792916
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	_MUTTER_PRESENTATION_OUTPUT: 0 
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
		0 1 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	max bpc: 8 
		range: (8, 16)
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 102 
		supported: 102
	non-desktop: 0 
		range: (0, 1)
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
	Identifier: 0x57
	Timestamp:  792916
	Subpixel:   unknown
	Clones:    
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	_MUTTER_PRESENTATION_OUTPUT: 0 
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
		0 1 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	max bpc: 8 
		range: (8, 16)
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 105 
		supported: 105
	non-desktop: 0 
		range: (0, 1)
DisplayPort-4 connected 1920x1080+1920+0 (0x62) normal (normal left inverted right x axis y axis) 598mm x 336mm
	Identifier: 0x705
	Timestamp:  792916
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       1
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	_MUTTER_PRESENTATION_OUTPUT: 0 
	EDID: 
		00ffffffffffff0010ac864157303532
		301d0104a53c22783a4815a756529c27
		0f5054a54b00714f8180a9c0d1c00101
		010101010101023a801871382d40582c
		450056502100001e000000ff00443159
		5a5353320a2020202020000000fc0044
		454c4c20503237313948430a000000fd
		00384c1e5311010a20202020202000b5
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
		0 1 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	max bpc: 8 
		range: (8, 16)
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 120 
		supported: 120
	non-desktop: 0 
		range: (0, 1)
  1920x1080 (0x62) 148.500MHz +HSync +VSync *current +preferred
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.50KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  60.00Hz
  1600x900 (0x63) 108.000MHz +HSync +VSync
        h: width  1600 start 1624 end 1704 total 1800 skew    0 clock  60.00KHz
        v: height  900 start  901 end  904 total 1000           clock  60.00Hz
  1280x1024 (0x64) 135.000MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock  79.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  75.02Hz
  1280x1024 (0x65) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1152x864 (0x66) 108.000MHz +HSync +VSync
        h: width  1152 start 1216 end 1344 total 1600 skew    0 clock  67.50KHz
        v: height  864 start  865 end  868 total  900           clock  75.00Hz
  1024x768 (0x67) 78.750MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.02KHz
        v: height  768 start  769 end  772 total  800           clock  75.03Hz
  1024x768 (0x68) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  800x600 (0x69) 49.500MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock  46.88KHz
        v: height  600 start  601 end  604 total  625           clock  75.00Hz
  800x600 (0x6a) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  640x480 (0x6b) 31.500MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock  37.50KHz
        v: height  480 start  481 end  484 total  500           clock  75.00Hz
  640x480 (0x6c) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
  720x400 (0x6d) 28.320MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock  31.47KHz
        v: height  400 start  412 end  414 total  449           clock  70.08Hz
DisplayPort-5 connected 1920x1080+3840+0 (0x62) normal (normal left inverted right x axis y axis) 598mm x 336mm
	Identifier: 0x706
	Timestamp:  792916
	Subpixel:   unknown
	Gamma:      1.0:1.0:1.0
	Brightness: 1.0
	Clones:    
	CRTC:       2
	CRTCs:      0 1 2 3
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000
	           filter: 
	_MUTTER_PRESENTATION_OUTPUT: 0 
	EDID: 
		00ffffffffffff0010ac844142545342
		0c1e0104a53c22783a4815a756529c27
		0f5054a54b00714f8180a9c0d1c00101
		010101010101023a801871382d40582c
		450056502100001e000000ff00374b51
		5a5653320a2020202020000000fc0044
		454c4c205032373139480a20000000fd
		00384c1e5311010a20202020202000b8
	GAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	DEGAMMA_LUT_SIZE: 4096 
		range: (0, -1)
	GAMMA_LUT: 0 
		range: (0, 65535)
	CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 
		0 1 
	DEGAMMA_LUT: 0 
		range: (0, 65535)
	TearFree: auto 
		supported: off, on, auto
	max bpc: 8 
		range: (8, 16)
	HDCP Content Type: HDCP Type0 
		supported: HDCP Type0, HDCP Type1
	Content Protection: Undesired 
		supported: Undesired, Desired, Enabled
	underscan vborder: 0 
		range: (0, 128)
	underscan hborder: 0 
		range: (0, 128)
	underscan: off 
		supported: off, on, auto
	scaling mode: None 
		supported: None, Full, Center, Full aspect
	link-status: Good 
		supported: Good, Bad
	CONNECTOR_ID: 117 
		supported: 117
	non-desktop: 0 
		range: (0, 1)
  1920x1080 (0x62) 148.500MHz +HSync +VSync *current +preferred
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.50KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  60.00Hz
  1600x900 (0x63) 108.000MHz +HSync +VSync
        h: width  1600 start 1624 end 1704 total 1800 skew    0 clock  60.00KHz
        v: height  900 start  901 end  904 total 1000           clock  60.00Hz
  1280x1024 (0x64) 135.000MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock  79.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  75.02Hz
  1280x1024 (0x65) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1152x864 (0x66) 108.000MHz +HSync +VSync
        h: width  1152 start 1216 end 1344 total 1600 skew    0 clock  67.50KHz
        v: height  864 start  865 end  868 total  900           clock  75.00Hz
  1024x768 (0x67) 78.750MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.02KHz
        v: height  768 start  769 end  772 total  800           clock  75.03Hz
  1024x768 (0x68) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  800x600 (0x69) 49.500MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock  46.88KHz
        v: height  600 start  601 end  604 total  625           clock  75.00Hz
  800x600 (0x6a) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  640x480 (0x6b) 31.500MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock  37.50KHz
        v: height  480 start  481 end  484 total  500           clock  75.00Hz
  640x480 (0x6c) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
  720x400 (0x6d) 28.320MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock  31.47KHz
        v: height  400 start  412 end  414 total  449           clock  70.08Hz

[frezbo]

Forgot to add the machine info, this is a ThinkPad T14 with AMD integrated CPU/GPU

[frezbo]

More updates, switching to wayland seems to have fixed this, so it seems it's something of a combination between Xorg and the kernel version probably.

[leviport]

Forgot to add the machine info, this is a ThinkPad T14 with AMD integrated CPU/GPU

This info should probably go into pop-os/linux#187 then. The reason I wasn't sure about this being the same bug is because the OP of this issue has Nvidia graphics.

[phodamentals]

Update here for 2023. Still broken after upgrade to 6.0.12

Distribution (run cat /etc/os-release):

NAME="Pop!_OS"
VERSION="22.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 22.04 LTS"
VERSION_ID="22.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=jammy
UBUNTU_CODENAME=jammy
LOGO=distributor-logo-pop-os

Related Application and/or Package Version (run apt policy $PACKAGE NAME):
N/A

Issue/Bug Description:
I have been using multi monitor support with display port MST "daisy chaining" for almost 3 years now with my XPS 15 7590 and have been pleasantly impressed how easy it was to configure unlike back in the olden days.

However, I believe that a recent update has since broken the functionality. I can only enable the internal laptop display plus 2 of the 3 external monitors. I even resorted to dusting off my xrandr skills and tried various configurations/scripting, however none of which will force my eDP-1 to turn off according to xrandr -q.

Steps to reproduce (if you know):

• Plug USB-C to Display Port cable to Monitor 1 (MST), DP out to Monitor 2 (MST on), DP out to Monitor 3 (MST off), attempt to disable internal laptop display
• Attempt to force enable Monitor 3, but after applying changes, 3rd monitor disappears from 'Displays' configuration.
• Attempt to create custom xrandr script.
• Attempt to do a clean roll-back to earlier NVIDIA driver versions (510 and 470) but yielded same results

Update 2023:

• Upgraded to kernel 6.0.12 to see if there are any improvements given that similar user issues MST over DisplayPort (daisy chain) bug in 6.0.2 and 6.0.3 on HP Dev One linux#187 were resolved by Linux 6.0.12 linux#194
• Upgraded to NVIDIA driver to 525.60
• Reboot. Same result as before

Expected behavior:

• All 3 external daisy-chained MST monitors to be joined and internal display to be truly shut off when cable is connected.

Other Notes:

uname-r
6.0.12-76060006-generic

xrandr -q
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   3840x2160     60.00 +  59.98    59.97  
   3200x1800     59.96    59.94  
   2880x1620     59.96    59.97  
   2560x1600     59.99    59.97  
   2560x1440     59.99    59.99    59.96    59.95  
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     59.99    59.98    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     60.01*   59.97    59.96    59.93  
   1600x1200     60.00  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-1-8 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  50.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-1-8 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  50.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-1-1-1 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +  50.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  

nvidia-smi
Wed Jan  4 14:52:53 2023       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 525.60.11    Driver Version: 525.60.11    CUDA Version: 12.0     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA GeForce ...  Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   48C    P0     4W /  N/A |      5MiB /  4096MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      5817      G   /usr/lib/xorg/Xorg                  4MiB |
+-----------------------------------------------------------------------------+

[phodamentals]

Still facing issues -- I tried enabling Wayland and restarted GDM service and had a reverse issue of the furthest right-hand monitor and middle monitor being activated but the left-hand one not getting activated.

[phodamentals]

Update: Noticing even more frequent screen blacking once in a while...

uname -r
6.2.6-76060206-generic

nvidia-smi
Fri Jun  2 16:29:14 2023       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 525.105.17   Driver Version: 525.105.17   CUDA Version: 12.0     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|                               |                      |               MIG M. |
|===============================+======================+======================|
|   0  NVIDIA GeForce ...  Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   53C    P3     3W /  30W |      5MiB /  4096MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A      5301      G   /usr/lib/xorg/Xorg                  4MiB |
+-----------------------------------------------------------------------------+

[leviport]

I just had a thought -- are you also charging the laptop through the monitor with USB-C charging? If so, the laptop could be drawing more than the display can output and it's disconnecting. If your laptop also has a barrel charger, it might be worth trying with that plugged in to see if it stops.

[phodamentals]

@leviport I am not. Charging from a barrel charger.

[leviport]

Gotcha. It was a long shot, but figured it was worth checking.