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

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

[bugzilla-daemon]

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

            Bug ID: 214199
           Summary: Sapphire NITRO+ RX 580 4G G5 - Secondary display
                    doesn't wake up on boot, both displays won't wake up
                    from suspend
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.13.12
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: kernel@zeljko.anonaddy.com
        Regression: No

Created attachment 298497
  --> https://bugzilla.kernel.org/attachment.cgi?id=298497&action=edit
Boot dmesg

Hi! This is the first time I've tried Linux with this graphics card.

The issues are that my second monitor doesn't wake up from stand by on boot and
also both monitors won't wake up from suspend.

If I turn off the second monitor and turn it back on after boot it works fine.

Same with both monitors after the computer wakes up from suspend. I have to
turn off both of them and turn them back on.

I'm attaching both boot and suspend dmesg logs with drm.debug=0xe kernel
parameter from a fresh install of Arch Linux.

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[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]

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

--- Comment #1 from Zeljko (kernel@zeljko.anonaddy.com) ---
Created attachment 298499
  --> https://bugzilla.kernel.org/attachment.cgi?id=298499&action=edit
Suspend dmesg

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[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]

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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