[Bug 106959] kernel 4.18rc1 amdgpu can't 4k60hz over HDMI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106959

--- Comment #14 from mikita.lipski at amd.com <mikita.lipski at amd.com> ---
Could you please also enable KMS debug messages before plugging in HDMI display
(or choosing 60Hz refresh rate), while I'm trying to find a display to
reproduce the issue on my setup. Just run this command as a sudo: 
# echo 0x4 > /sys/module/drm/parameters/debug

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