[Bug 110423] Forced EDID is ignored

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110423

            Bug ID: 110423
           Summary: Forced EDID is ignored
           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: Heiko.Lechner at ruhr-uni-bochum.de

Created attachment 143968
  --> https://bugs.freedesktop.org/attachment.cgi?id=143968&action=edit
output from edid-decode from hacked EDID file

I have a tv that does not handle YCbCr properly but advertises it in his EDID.
So I have to force Full RGB over HDMI because it seems that my RX 570 uses
YCbCr by default (maybe because of the HDMI connection?).
There is no switch to force Full RGB so I downloaded the EDID with get-edid
using i2c and hacked it to disable the advertisement of YcbCr. I copied it to
the initrd and force loaded it via drm.edid_firmware=edid/PhilipsFTV.bin.
It works:
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.0.0-trunk-amd64
root=UUID=1c91ef55-0cf6-4694-bd2a-29aeb6492b3b ro
drm.edid_firmware=edid/PhilipsFTV.bin
[    0.849967] platform HDMI-A-1: firmware: direct-loading firmware
edid/PhilipsFTV.bin
[    0.850055] [drm] Got external EDID base block and 1 extension from
"edid/PhilipsFTV.bin" for connector "HDMI-A-1"

But the problems with my tv persist. So I think that the forced EDID is ignored
by AMDGPU.

uname -a:
Linux Heimkino-PC 5.0.0-trunk-amd64 #1 SMP Debian 5.0.7-1~exp1 (2019-03-22)
x86_64 GNU/Linux

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