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screenpad-plus.md

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Firmware

ACPI - WMI Methods

References:

  • Based on Plippo's discovery of WMI methods used for screenpad backlight (ref), which is incorporated as part of the linux asus-wmi-screenpad repository: 
    • // include/linux/platform_data/x86/asus-wmi.h#L54-60
// + asus-wmi-screenpad/inc/asus-wmi.h#L5-6
  54  | /* Backlight and Brightness */
  55  | #define ASUS_WMI_DEVID_ALS_ENABLE       0x00050001
  56  | #define ASUS_WMI_DEVID_BACKLIGHT        0x00050011
  57  | #define ASUS_WMI_DEVID_BRIGHTNESS       0x00050012
  58  | #define ASUS_WMI_DEVID_KBD_BACKLIGHT    0x00050021
  59  | #define ASUS_WMI_DEVID_LIGHT_SENSOR     0x00050022
  60  | #define ASUS_WMI_DEVID_LIGHTBAR         0x00050025
+ 61  | #define ASUS_WMI_DEVID_SCREENPAD        0x00050031
+ 62  | #define ASUS_WMI_DEVID_SCREENPAD_LIGHT  0x00050032
  • See SSDT-SPLC.dsl (and issue Screenpad Plus Backlight Control #6) for implementation notes: 
    • External (\_SB.ATKD.WMNB, MethodObj)
// Sets the screenpad plus backlight intensity,
// where 'xx' is a hex value between 0x00 and 0xFF.
\_SB.ATKD.WMNB(0x0, 0x53564544, /*b32000500xx000000*/)
//                  ^--Arg1--^     ^-----Arg2-----^
//                                 ^-IIA0-^^-IIA1-^
// Disables screenpad plus until next backlight change.
\_SB.ATKD.WMNB(0x0, 0x53564544, /*b3100050000000000*/)
//                  ^--Arg1--^     ^-----Arg2-----^
//                                 ^-IIA0-^^-IIA1-^

WMNB Methods - DSDT

// Reference: docs/resources/firmware/UX481FL/DSDT.dsl
        // \_SB.ATKD.WMNB
54953 | Method (WMNB, 3, Serialized)
54954 | {
54955 |     CreateDWordField (Arg2, Zero, IIA0)
54956 |     CreateDWordField (Arg2, 0x04, IIA1)
54957 |     Local0 = (Arg1 & 0xFFFFFFFF)
...
55362 |     If ((Local0 == 0x53564544))
55363 |     {
...
55524 |         Name (TMBF, Buffer (0x02)
55525 |         {
55526 |             0x00, 0x00
55527 |         })
55528 |         If ((IIA0 == 0x00050031))
55529 |         {
55530 |             TMBF [Zero] = Zero
55531 |             Local0 = ^^PCI0.LPCB.EC0.REBC (0x12, 0x02)
55532 |             Local1 = DerefOf (Local0 [Zero])
55533 |             If ((IIA1 == One))
55534 |             {
55535 |                 Local1 &= 0xFD
55536 |             }
55537 |             Else
55538 |             {
55539 |                 Local1 |= 0x02
55540 |             }
55541 |         
55542 |             TMBF [One] = Local1
55543 |             Return (^^PCI0.LPCB.EC0.WEBC (0x13, 0x02, TMBF))
55544 |             Return (Zero)
55545 |         }
55546 |         
55547 |         If ((IIA0 == 0x00050032))
55548 |         {
55549 |             TMBF [One] = IIA1 /* \_SB_.ATKD.WMNB.IIA1 */
55550 |             TMBF [Zero] = One
55551 |             Return (^^PCI0.LPCB.EC0.WEBC (0x13, 0x02, TMBF))
55552 |             Return (Zero)
55553 |         }
55554 |         
55555 |         If ((IIA0 == 0x00050035))
55556 |         {
55557 |             TMBF [Zero] = Zero
55558 |             Local0 = ^^PCI0.LPCB.EC0.REBC (0x12, 0x02)
55559 |             Local1 = DerefOf (Local0 [Zero])
55560 |             If ((IIA1 == Zero))
55561 |             {
55562 |                 Local1 &= 0xF7
55563 |             }
55564 |             ElseIf ((IIA1 == One))
55565 |             {
55566 |                 Local1 |= 0x08
55567 |             }
55568 |         
55569 |             TMBF [One] = Local1
55570 |             Return (^^PCI0.LPCB.EC0.WEBC (0x13, 0x02, TMBF))
55571 |             Return (Zero)
55572 |         }

E²PROM - EDID output

References:

edid-decode output

edid-decode (hex):

00 ff ff ff ff ff ff 00 09 e5 7f 08 00 00 00 00
01 1d 01 04 a5 1f 08 78 02 d2 2d 93 51 57 8d 28
18 4e 52 00 00 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 94 1b 80 a0 70 03 32 20 30 20
55 00 35 53 10 00 00 1a 12 16 80 a0 70 03 32 20
30 20 55 00 35 53 10 00 00 1a 00 00 00 fe 00 42
4f 45 20 48 46 0a 20 20 20 20 20 20 00 00 00 fe
00 4e 56 31 32 36 42 35 4d 2d 4e 34 31 0a 00 ed

----------------

Block 0, Base EDID:
  EDID Structure Version & Revision: 1.4
  Vendor & Product Identification:
    Manufacturer: BOE
    Model: 2175
    Made in: week 1 of 2019
  Basic Display Parameters & Features:
    Digital display
    Bits per primary color channel: 8
    DisplayPort interface
    Maximum image size: 31 cm x 8 cm
    Gamma: 2.20
    Supported color formats: RGB 4:4:4
    First detailed timing includes the native pixel format and preferred refresh rate
  Color Characteristics:
    Red  : 0.5771, 0.3173
    Green: 0.3398, 0.5527
    Blue : 0.1562, 0.0957
    White: 0.3076, 0.3212
  Established Timings I & II: none
  Standard Timings: none
  Detailed Timing Descriptors:
    DTD 1:  1920x515    60.074881 Hz 384:103   33.942 kHz     70.600000 MHz (309 mm x 83 mm)
                 Hfront   48 Hsync  32 Hback   80 Hpol P
                 Vfront    5 Vsync   5 Vback   40 Vpol N
    DTD 2:  1920x515    48.076923 Hz 384:103   27.163 kHz     56.500000 MHz (309 mm x 83 mm)
                 Hfront   48 Hsync  32 Hback   80 Hpol P
                 Vfront    5 Vsync   5 Vback   40 Vpol N
    Alphanumeric Data String: 'BOE HF'
    Alphanumeric Data String: 'NV126B5M-N41'
Checksum: 0xed

----------------

Warnings:

Block 0, Base EDID:
  Basic Display Parameters & Features: Dubious maximum image size (31x8 is smaller than 10x10 cm).

Failures:

Block 0, Base EDID:
  Missing Display Product Name.

EDID conformity: FAIL

Schematic

UX481FA/FL Schematic

References:

Datasheets:

Parts:

Item Image
Asus Screen module blue touch screenpad FHD 12

SKU: MODULESCREENPADUX481BLUEFHD
P/N: 90NB0P61-R20010

EDP Cable reference: 1422-03ER0AS		 back-screenpad-topcase
Asus Touch controller card for UX481FLY

SKU: TOUCHCONTBDUX481
P/N: 90NB0P60-R10020
Model: 60NB0P60-TP1020		 touch-controller

CPU - Display Signals (U0301A, Page 3)

Pin Signal PCH GPIO DP LCD Connector (J4501) Description
AC6 DDI1_AUX_P DP_AUXP_C DP1 Auxiliary Channel (AUX_​CH)
AC7 DDI1_AUX# DP_AUXP_C DP1 Auxiliary Channel (AUX_​CH)
AL5 DDI1_TXN_0 DDI1_TXN0_C DP1 differential negative input (ML_Lane 0)
AL6 DDI1_TXP_0 DDI1_TXP0_C DP1 differential positive input (ML_Lane 0)
AJ5 DDI1_TXN_1 DDI1_TXN1_C DP1 differential negative input (ML_Lane 1)
AJ6 DDI1_TXP_1 DDI1_TXP1_C DP1 differential positive input (ML_Lane 1)
CN6 DDPB_HPD0 GPP_E13 DP_HPD_PCH_C Also known as SPI1_MOSI.
This handles sending SPI1 touchscreen serial input data to the PCH.
CC8 DDPB_SCL_PCH GPP_E18 Also known as DDP1_CTRLCLK.
Handles control clock data for Display Port C.
CC9 DDPB_SDA_PCH GPP_E19 Also known as DDP1_CTRLDATA (used as TBT_LSX).
Handles DDP1 I2C / TBT_LSX0 pins VCC configuration.
• 0 = DDP1 I2C / TBT_LSX0 pins at 1.8V
• 1 = DDP1 I2C / TBT_LSX0 pins at 3.3V

DP LCD Connector (J4501, Page 31)

Pin Signal PCH GPIO EC IT8225 GPIO CPU (U0301A) Description
1 CABC_DP_EN GPJ7 (CABC_EN)
2 (GND)
3 DP_TXN1_C DDI1_TXN_1 [^]
4 DP_TXP1_C DDI1_TXP_1 [^]
5 (GND)
6 DP_TXN0_C DDI1_TXN_0 [^]
7 DP_TXP0_C DDI1_TXP_0 [^]
8 (GND)
9 DP_AUXP_C DDI1_AUX_P [^]
10 DP_AUXN_C DDI1_AUX# [^]
11 (GND)
12 (GND)
13 -
14 +3VS_DP
15 +3VS_DP
16 -
17 DP_HPD_PCH_C GPP_E13 (DDPB_HPD0) GPF4 (DP_HPD#) [^]
18 DP_BLEN_C GPB2 (DP_BL_EN)
19 DP_PWM_C GPA7 (DP_PWM)
20 -
21 AC_BAT_SYS_DP
22 AC_BAT_SYS_DP
23 -
24 -
25 +3VS_TP
26 (GND)
27 DP_TP_Report_SW
28 I2C3_SCL_TCH_PNL GPP_H7 I2C link 3 serial clock line (touchscreen).
29 I2C3_SDA_TCH_PNL GPP_H6 I2C link 3 data clock line (touchscreen).
30 TPanel_INT#_2ND GPP_B18 Also known as GSPIO_MOSI.
This is a pin-up strap that toggles 'No Reboot' mode.
• 0 = Disable “No Reboot” mode. (Default)
• 1 = Enable “No Reboot” mode (PCH will disable the TCO Timer system reboot feature).
31 GND1
32 GND2
33 GND3
34 GND4

Specification

Datasheets:

Intel DDI Specification