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@lists.freedesktop.org
Reporter: heiko.lech...@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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