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[AMDGPU] RX 5700/6900XT doesn’t enable 4k 144hz mode with DSC (#1564) · Issues · drm / amd · GitLab

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Issue created by Ryan Houdek@sonicadvance1?

Brief summary of the problem:

My Radeon RX 5700 which is supposed to support DSC doesn’t expose my monitor’s 4k 144hz mode.
The most I can get is 120Hz which doesn’t use DSC.

Hardware description:

  • CPU: Threadripper 2990WX
  • GPU: Radeon RX 5700
  • System Memory: 64GB
  • Display(s): Asus ROG Swift PG43UQ
  • Type of Diplay Connection: Displayport 1. 4

System infomration:

  • Distro name and Version: Ubuntu 21.04 pre-release
  • Kernel version: 5.11.0

How to reproduce the issue:

Install yourself a monitor that uses DSC, and a Radeon GPU that supports DSC.
See that DSC modes aren’t exposed.
4k 144Hz, 1080p 360hz, either should work.
I’m testing on an Asus ROG Swift PG43UQ though.

Attached files:

  • Attached the monitor’s EDID
    Asus_PG43UQ
        EDID:
                00ffffffffffff0006b3a14301010101
                011d0104b55e35783bba35ae4f47aa27
                105054bfcf00814081809500714f81c0
                b300d1c001014dd000a0f0703e803020
                3500ad113200001a14ec00a0a0a06750
                20303500ad113200001a000000fd0030
                90fefe6c010a202020202020000000fc
                00415355532050473433550a202002ec
                02033bf14f010304131f120211900f0e
                1d1e6061230907078301000065030c00
                10006d1a0000020b309000058e25802b
                e305c001e60605018e7512346c80a070
                703e803020080cad113200001a8a6f80
                a0703840403020280cad113200001a6f
                c200a0a0a0555030203500ad11320000
                1a0000000000000000000000000000ef
                701279000003016447f80104ff0e4f00
                07001f006f087e0070000700eba30104
                ff0e4f0007001f006f087e0070000700
                d0500104ff0e9f0010003e006f082700
                140007009b120104ff0e4f0007801f00
                6f08520044000700cc7c0100ff0e4f00
                07001f003f067e007000070000000000
                0000000000000000000000000000b590
        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
        subconnector: Native
                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: 1
                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: 107
                supported: 107
        non-desktop: 0
                range: (0, 1)
   3840x2160     60. 00 + 119.91*   97.98    79.95    60.00    50.00    59.94
   3840x1600    144.00
   1920x2160     59.93
   2560x1440    144.00   120.00
   1920x1200     60.00
   1920x1080    120.00    60.00    60.00    50.00    59.94
   1600x1200     60.00
   1680x1050     59.95
   1280x1024     75.02    60.02
   1440x900      59.89
   1280x960      60.00
   1280x800      60.00
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1440x576      50.00
   1024x768      75.03    70.07    60.00
   1440x480      60.00    59.94
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08```

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