[Bug 108575] amd-staging-drm-next, R4 Mullins hdmi monitor wont wake up from S3 - *ERROR* REG_WAIT timeout 1us * 80000 tries - dce_abm_immediate_disable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108575

--- Comment #1 from Przemek <soprwa at gmail.com> ---
Created attachment 142606
  --> https://bugs.freedesktop.org/attachment.cgi?id=142606&action=edit
picture of the screen after resume

With latest (yesterday's) amd-staging-drm-next repo pull situation gets worse.
After fresh boot and when drm amdgpu fb gets initialized laptop internal screen
gets off and picture appears on external monitor connected to hdmi output.

After sddm login, when plasma desktop fires up picture appears on eDP screen
and both (hdmi and internal) are working properly until suspending (s3).

After resume from suspend there is no picture on hdmi monitor, brightess level
is reset to 0, on eDP picture is shuttered and full of glitches as you can see
on attached photo (it does no matter if it is xorg or tty, both have those
glitches).
Thanks,
Przemek.

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