[Bug 97730] Monitor not recognized after upgrading to a Radeon RX 480

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97730

            Bug ID: 97730
           Summary: Monitor not recognized after upgrading to a Radeon RX
                    480
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: damien at grassart.com

Created attachment 126413
  --> https://bugs.freedesktop.org/attachment.cgi?id=126413&action=edit
/sys/class/drm/card0-DP-2/edid

I upgraded my video card from a Radeon HD 8770 to a Radeon RX 480 after which
my monitor stopped working. I believe it is an EDID problem since dmesg
contains this repeated 4 times:

[  +0.120622] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is
invalid, remainder is 128
[  +0.000011] Raw EDID:
[  +0.000005]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000004]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000005]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000004]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000005]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000005]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000004]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[  +0.000005]   ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

As well as:

[  +0.000005] amdgpu 0000:01:00.0: DP-2: Ignoring invalid EDID block 1.
[  +0.149608] amdgpu 0000:01:00.0: No connectors reported connected with modes

xrandr shows this error message when I run it: "xrandr: Output DisplayPort-1 is
not disconnected but has no modes".

I can actually get the monitor working by manually adding a mode:

$ cvt 2560 1440
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00"  312.25  2560 2752 3024 3488  1440 1443 1448 1493
-hsync +vsync
$ xrandr --newmode "2560x1440" 312.25  2560 2752 3024 3488  1440 1443 1448 1493
-hsync +vsync
$ xrandr --addmode DisplayPort-1 2560x1440

I've attached the /sys/class/drm/card0-DP-2/edid file if that is helpful.
Please let me know if I can provide anything else.

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