[Bug 102646] Screen flickering under amdgpu-experimental [buggy auto power profile]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102646

--- Comment #83 from Tom B <tom at r.je> ---
I have a similar problem with my Radeon VII. My testing/experiments are
outlined here: https://bugs.freedesktop.org/show_bug.cgi?id=110510 sorry for
the long post!

However my bug seems slightly different albeit related.

1. The flicker only occurs on my HDMI monitor. It's a flicker and sometimes the
screen will go black for a couple of seconds

2. If the HDMI monitor is the only monitor connected I can set the refresh rate
to 59.94 instead of 60.00 and it is fine

3. If the HDMI monitor and a displayport monitor are both connected the flicker
still occurs. However, trying to set the HDMI monitor to 59.94hz causes the
system to freeze and I have to do a hard reset (it's fine if the HDMI monitor
is the only monitor)

4. Setting power_dpm_force_performance_level to high alone does not fix it. But
by running the higher power state I can set the HDMI monitor to 59.94hz without
the system freezing


In short: I need to use 59.94hz to stop the flickering and I need to use high
power state to set the refresh rate without freezing the entire system. 


Although this is an acceptable workaround I would like to see a proper fix.

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