[Bug 107414] "No EDID firmware found on connector" when display forced on and EDID file provided

[Bug 107414] "No EDID firmware found on connector" when display forced on and EDID file provided

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107414

            Bug ID: 107414
           Summary: "No EDID firmware found on connector" when display
                    forced on and EDID file provided
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: chewi@gentoo.org

Created attachment 140869
  --> https://bugs.freedesktop.org/attachment.cgi?id=140869&action=edit
Kernel log showing one display on and one display off

I've been using drm.edid_firmware for a long time now to provide some stability
in my setup, which includes an A/V receiver that isn't always on. However, I've
found that it still isn't as stable as I'd like it to be because this alone
doesn't force the display to be connected. Only the "e" option in the video
parameter does that so I've added it and it works but only if the display is
actually switched on at boot time!

It seems that the provided EDID file is initially ignored when the "e" option
is checked, resulting in the following error and the display actually being
forced off.

[drm:amdgpu_dm_connector_mode_valid [amdgpu]] *ERROR* No EDID firmware found on
connector: HDMI-A-1 ,forcing to OFF!

This may be because the EDID file only seems to be read during a mode set. It
certainly isn't because the file isn't available yet as I've added it to the
initramfs to make sure and the second display that is switched on picks it up.

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[Bug 107414] [amdgpu] "No EDID firmware found on connector" when display forced on and EDID file provided

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https://bugs.freedesktop.org/show_bug.cgi?id=107414

James Le Cuirot <chewi@gentoo.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|"No EDID firmware found on  |[amdgpu] "No EDID firmware
                   |connector" when display     |found on connector" when
                   |forced on and EDID file     |display forced on and EDID
                   |provided                    |file provided

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[Bug 107414] [amdgpu] "No EDID firmware found on connector" when display forced on and EDID file provided

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https://bugs.freedesktop.org/show_bug.cgi?id=107414

--- Comment #1 from Timothy Pearson <tpearson@raptorengineering.com> ---
I'm also seeing this on 4.20 with amdgpu.  In my case though it also triggers a
problem with amdgpu, a problem that would not be hit if the options were
honored correctly:

[    7.843957] [drm] Display Core initialized with v3.1.68!
[    7.844448] [drm] forcing DP-3 connector on
[   11.785325] [drm:emulated_link_detect [amdgpu]] *ERROR* Failed to read EDID
[   11.785372] [drm] forcing DP-4 connector on
[   11.805994] [drm] Got external EDID base block and 1 extension from
"edid/edid.bin" for connector "DP-4"
[   11.822809] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[   11.822825] [drm] Driver supports precise vblank timestamp query.
[   11.849368] [drm] UVD and UVD ENC initialized successfully.
[   11.950326] [drm] VCE initialized successfully.
[   11.950636] [drm:amdgpu_dm_connector_mode_valid [amdgpu]] *ERROR* No EDID
firmware found on connector: DP-3 ,forcing to OFF!
[   11.950731] [drm:amdgpu_dm_connector_mode_valid [amdgpu]] *ERROR* No EDID
firmware found on connector: DP-3 ,forcing to OFF!
[   11.950782] ------------[ cut here ]------------
[   11.950802] kernel BUG at mm/slub.c:294

Kernel command line:
amdgpu.dc=1 drm_kms_helper.edid_firmware=DP-3:edid/edid.bin
drm_kms_helper.edid_firmware=DP-4:edid/edid.bin video=DP-3:1920x1080D
video=DP-4:1920x1080D

This is for a video broadcast system that "features" output sinks being
connected and disconnected quite frequently; this should be handled seamlessly
but Linux is not honoring the options here.

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[Bug 107414] [amdgpu] "No EDID firmware found on connector" when display forced on and EDID file provided

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https://bugs.freedesktop.org/show_bug.cgi?id=107414

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #2 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/469.

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