https://bugs.freedesktop.org/show_bug.cgi?id=110856
--- Comment #10 from Ropid <rro...@gmail.com> ---
Those Xorg config options you tried to use do not exist on the
xf86-video-amdgpu driver (I mean "CustomEDID" etc.). Those EDID options you
used are unique Nvidia driver config options and do not exist in any other
driver.
If you are intersted, you can find a list about possible Xorg options for
amdgpu by running "man 4 amdgpu", and then there's more general stuff
documented in "man xorg.conf". There is sadly nothing about EDID anywhere.
For the open drivers that use kernel-mode-setting, you need to tell the driver
about your EDID file on the kernel command line. That's the only way to do it.
In the /etc/mkinitcpio.conf file you shared, you made a mistake on the
"MODULES=..." line. You need to remove that "drm_kms_helper..." text from that
line. That text you added there has to go onto the kernel command line, not
into mkinitcpio.conf.
The only thing you have to do in /etc/mkinitcpio.conf is what you already did
on the "FILES=..." line.
About that "drm_kms_helper..." kernel command line parameter, where you have to
add it is your boot loader's configuration file. I don't know how that works on
Manjaro.
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