[Bug 214199] Sapphire NITRO+ RX 580 4G G5 - Secondary display doesn't wake up on boot, both displays won't wake up from suspend

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214199

--- Comment #2 from Zeljko (kernel@zeljko.anonaddy.com) ---
At first, I've got both monitors to work correctly with amdgpu.dc=0 kernel
parameter.


After analyzing the dmesg outputs without the above kernel parameter I've
noticed that, on boot, my second monitor (connected on HDMI-A-2) was detected
but went on some kind of loop reporting that the Edid was changed.

[drm:dc_link_detect_helper [amdgpu]] link=3, dc_sink_in=0000000000000000 is now
Disconnected prev_sink=000000009ae23fd3 dpcd same=1 edid same=0
[drm:amdgpu_dm_update_connector_after_detect [amdgpu]] DCHPD: connector_id=3:
Old sink=000000009ae23fd3 New sink=0000000000000000
[drm:drm_connector_update_edid_property [drm]] [CONNECTOR:79:HDMI-A-2] Edid was
changed.
[drm:drm_connector_update_edid_property [drm]] Updating change counter to 61


Same thing happens when the computer wakes up from suspend, but than both
monitors go into the same kind of loop.

[drm:dc_link_detect_helper [amdgpu]] link=3, dc_sink_in=0000000000000000 is now
Disconnected prev_sink=000000003f9f81c9 dpcd same=1 edid same=0
[drm:amdgpu_dm_update_connector_after_detect [amdgpu]] DCHPD: connector_id=3:
Old sink=000000003f9f81c9 New sink=0000000000000000
[drm:drm_connector_update_edid_property [drm]] [CONNECTOR:79:HDMI-A-2] Edid was
changed.
[drm:drm_connector_update_edid_property [drm]] Updating change counter to 118

[drm:dc_link_detect_helper [amdgpu]] link=2, dc_sink_in=0000000000000000 is now
Disconnected prev_sink=000000006f240528 dpcd same=1 edid same=0
[drm:amdgpu_dm_update_connector_after_detect [amdgpu]] DCHPD: connector_id=2:
Old sink=000000006f240528 New sink=0000000000000000
[drm:drm_connector_update_edid_property [drm]] [CONNECTOR:74:HDMI-A-1] Edid was
changed.
[drm:drm_connector_update_edid_property [drm]] Updating change counter to 41


After some googling I've managed to get both monitors working correctly without
amdgpu.dc=0 by forcing edid files extracted from both monitors using these
kernel parameters:

video=HDMI-A-1:e video=HDMI-A-2:e
drm.edid_firmware=HDMI-A-1:edid/edid1.bin,HDMI-A-2:edid/edid2.bin


Couple more details that may help:
- both monitors are the same model BenQ GW2470
- they are both connected via a HDMI 2.0 cable from the same maker and are the
same length
- I've decoded and compared both edid files and the only differences are the
"Display Product Serial Number" and "Checksum"

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