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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: chewi at 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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