Black lines around UI elements with fractional scaling

[axel358]

Distribution

Mint 21.3

Package version

Muffin 6.X

Graphics hardware in use

Intel Iris

Frequency

Always

Bug description

Black outlined rectangles flicker around UI elements, buttons, windows etc.

Possibly related issues:
https://gitlab.gnome.org/GNOME/mutter/-/issues/1500

https://discourse.gnome.org/t/weird-windows-flickering-borders-on-gnome-3-36-with-fractional-scaling-enabled/3953

Potential fixes:
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1554

Steps to reproduce

Enable fractional scaling

Expected behavior

No lines

Additional information

No response

[ddouglas87]

Same bug. Someone else on Reddit wrote about experiencing the same bug too. I suspect this is the case for all graphics cards or just Nvidia graphics cards. My system is a vanilla fresh install of Mint 21.3 with only these modifications:

Accessibility: Large Text
Two 4k monitors plugged in, first fractional scaling 150%, second 200%.
Installed Nvidia video driver 555.52.04.
System updates up to date as of Jun 29th, 2024.
Installed nvidia-vaapi-driver, version v0.0.12 (Used for hardware youtube video playback in Firefox.)

Notes about my system:

bunny@happy:~$ neofetch
             ...-:::::-...                 bunny@happy 
          .-MMMMMMMMMMMMMMM-.              ----------- 
      .-MMMM`..-:::::::-..`MMMM-.          OS: Linux Mint 21.3 x86_64 
    .:MMMM.:MMMMMMMMMMMMMMM:.MMMM:.        Host: MS-7673 2.0 
   -MMM-M---MMMMMMMMMMMMMMMMMMM.MMM-       Kernel: 5.15.0-113-generic 
 `:MMM:MM`  :MMMM:....::-...-MMMM:MMM:`    Uptime: 2 mins 
 :MMM:MMM`  :MM:`  ``    ``  `:MMM:MMM:    Packages: 2455 (dpkg), 15 (flatpak), 
.MMM.MMMM`  :MM.  -MM.  .MM-  `MMMM.MMM.   Shell: bash 5.1.16 
:MMM:MMMM`  :MM.  -MM-  .MM:  `MMMM-MMM:   Resolution: 3840x2160, 5120x2880 
:MMM:MMMM`  :MM.  -MM-  .MM:  `MMMM:MMM:   DE: Cinnamon 6.0.4 
:MMM:MMMM`  :MM.  -MM-  .MM:  `MMMM-MMM:   WM: Mutter (Muffin) 
.MMM.MMMM`  :MM:--:MM:--:MM:  `MMMM.MMM.   WM Theme: Mint-Y-Dark-Aqua (Mint-Y) 
 :MMM:MMM-  `-MMMMMMMMMMMM-`  -MMM-MMM:    Theme: Mint-Y-Dark-Aqua [GTK2/3] 
  :MMM:MMM:`                `:MMM:MMM:     Icons: Mint-Y-Sand [GTK2/3] 
   .MMM.MMMM:--------------:MMMM.MMM.      Terminal: gnome-terminal 
     '-MMMM.-MMMMMMMMMMMMMMM-.MMMM-'       CPU: Intel i5-2500K (4) @ 3.700GHz 
       '.-MMMM``--:::::--``MMMM-.'         GPU: NVIDIA GeForce GTX 980 
            '-MMMMMMMMMMMMM-'              Memory: 2142MiB / 23980MiB 
               ``-:::::-``
                                                                   
                                                                  
bunny@happy:~$ muffin --version
mutter 6.0.1
Copyright © 2001-2011 Havoc Pennington, Red Hat, Inc., and others
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


bunny@happy:~$ modinfo nvidia
filename:       /lib/modules/5.15.0-113-generic/updates/dkms/nvidia.ko
alias:          char-major-195-*
version:        555.52.04
supported:      external
license:        NVIDIA
firmware:       nvidia/555.52.04/gsp_tu10x.bin
firmware:       nvidia/555.52.04/gsp_ga10x.bin
srcversion:     7CC59AD55E0DD69F0C28592
alias:          pci:v000010DEd*sv*sd*bc06sc80i00*
alias:          pci:v000010DEd*sv*sd*bc03sc02i00*
alias:          pci:v000010DEd*sv*sd*bc03sc00i00*
depends:        drm
retpoline:      Y
name:           nvidia
vermagic:       5.15.0-113-generic SMP mod_unload modversions 
sig_id:         PKCS#7
signer:         localhost.localdomain Secure Boot Module Signature key
sig_key:        02:E9:E7:A2:4A:F9:D1:E5:23:69:9F:CF:7B:BE:7C:41:34:5C:90:AB
sig_hashalgo:   sha512
signature:      3D:26:44:CA:A2:B3:9B:5D:7B:A0:A4:E7:87:52:9E:83:4B:8F:FD:17:
		0D:65:0F:AD:AC:B5:AF:B0:06:47:C6:3F:E8:D0:AE:D0:E2:8C:9C:BF:
		C8:2D:D0:CD:1E:D6:41:53:F5:27:62:54:C0:2A:39:D2:15:87:BA:4D:
		8F:5A:35:F0:51:4C:1E:8B:4B:EA:4F:D3:27:4D:B5:74:E0:2C:7E:BE:
		69:7F:5B:E2:01:7D:D8:51:0D:94:36:62:BC:C7:F3:B1:1D:23:01:C7:
		EA:76:04:E0:63:7D:E7:BE:5E:9F:A6:05:3B:22:EE:9B:E3:38:06:A5:
		01:60:DF:DC:21:78:F1:30:6A:10:1F:F4:FD:C8:EC:32:F6:BE:93:2D:
		B7:07:6A:FB:A4:0F:52:C5:73:0B:18:FA:84:0A:AF:13:A8:78:96:D7:
		44:FE:15:D1:18:25:56:D7:A6:91:25:77:50:05:F5:03:72:7F:96:A1:
		12:67:BD:D9:13:EC:59:FC:BE:6E:90:22:9B:78:4B:B4:36:BC:E9:B4:
		E4:76:44:2F:BD:DD:9D:D2:C8:DC:22:85:80:F6:F1:FD:45:D9:7A:4D:
		B1:10:80:93:59:C6:54:DB:44:0C:98:BF:7E:54:38:F0:C0:22:E6:F5:
		E2:50:D0:EF:3A:DE:18:88:FC:97:50:CB:D1:DC:4C:C1
parm:           NvSwitchRegDwords:NvSwitch regkey (charp)
parm:           NvSwitchBlacklist:NvSwitchBlacklist=uuid[,uuid...] (charp)
parm:           NVreg_ResmanDebugLevel:int
parm:           NVreg_RmLogonRC:int
parm:           NVreg_ModifyDeviceFiles:int
parm:           NVreg_DeviceFileUID:int
parm:           NVreg_DeviceFileGID:int
parm:           NVreg_DeviceFileMode:int
parm:           NVreg_InitializeSystemMemoryAllocations:int
parm:           NVreg_UsePageAttributeTable:int
parm:           NVreg_EnablePCIeGen3:int
parm:           NVreg_EnableMSI:int
parm:           NVreg_TCEBypassMode:int
parm:           NVreg_EnableStreamMemOPs:int
parm:           NVreg_RestrictProfilingToAdminUsers:int
parm:           NVreg_PreserveVideoMemoryAllocations:int
parm:           NVreg_EnableS0ixPowerManagement:int
parm:           NVreg_S0ixPowerManagementVideoMemoryThreshold:int
parm:           NVreg_DynamicPowerManagement:int
parm:           NVreg_DynamicPowerManagementVideoMemoryThreshold:int
parm:           NVreg_EnableGpuFirmware:int
parm:           NVreg_EnableGpuFirmwareLogs:int
parm:           NVreg_OpenRmEnableUnsupportedGpus:int
parm:           NVreg_EnableUserNUMAManagement:int
parm:           NVreg_MemoryPoolSize:int
parm:           NVreg_KMallocHeapMaxSize:int
parm:           NVreg_VMallocHeapMaxSize:int
parm:           NVreg_IgnoreMMIOCheck:int
parm:           NVreg_NvLinkDisable:int
parm:           NVreg_EnablePCIERelaxedOrderingMode:int
parm:           NVreg_RegisterPCIDriver:int
parm:           NVreg_EnableResizableBar:int
parm:           NVreg_EnableDbgBreakpoint:int
parm:           NVreg_EnableNonblockingOpen:int
parm:           NVreg_RegistryDwords:charp
parm:           NVreg_RegistryDwordsPerDevice:charp
parm:           NVreg_RmMsg:charp
parm:           NVreg_GpuBlacklist:charp
parm:           NVreg_TemporaryFilePath:charp
parm:           NVreg_ExcludedGpus:charp
parm:           NVreg_DmaRemapPeerMmio:int
parm:           NVreg_RmNvlinkBandwidth:charp
parm:           NVreg_ImexChannelCount:int
parm:           NVreg_CreateImexChannel0:int
parm:           rm_firmware_active:charp


bunny@happy:~$ cat /etc/environment
# Hardware Accelerated Youtube Video Playback
LIBVA_DRIVER_NAME=nvidia
MOZ_DISABLE_RDD_SANDBOX=1
__EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/10_nvidia.json
#NVD_BACKEND=egl

[Susensio]

Same problem on Mint 22, integrated intel graphics card.
It's a shame because fractional scaling on X introduces a lot of lag, and same on wayland introduces these black boxes.

[bramtechs]

Same issue on AMD RX 5600 XT on 4K monitor with scaling set to 150%.
Running on Debian Trixie.