Bug#894731: linux-image-4.15.0-2-amd64: Setting drm.edid_firmware or drm_kms_firmware.edid_firmware has no effect

[Andreas Schreiner <andreas.schreiner@sonnenmulde.at>]

Hi!

I can also confirm the issue with a TV that does not provide any EDID data.

The "drm_kms_firmware.edid_firmware" option worked with the 4.13 Kernel.

With the 4.15.x Kernel it stopped working. In fact it seems to disable
the display completely at boot so that I have to remove it as a boot option
to be able to use the system at all. Kernel 4.16.0-1 still has the
issue.

Neither drm_kms_firmware.edid_firmware=edid/1920x1080.bin nor
drm.edid_firmware=edid/1920x1080.bin do work currently.

X11 later recognizes the correct resolution but has the DPI setting
completely wrong (it guesses a 7" Display at 1920x1080). Applications
that regard the DPI settings (like VLC v3) are thus unusable.

Thank you!