[Bug 110510] Radeon VII HDMI issues: Flicking/system crashing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110510

--- Comment #3 from Tom B <tom at r.je> ---
Further testing after reading this:
https://bugs.freedesktop.org/show_bug.cgi?id=102646

If I run:

echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level

Before setting the refresh rate to 59.94hz it works perfectly! The system does
not freeze at all (at least not for the 5 minutes since I tried it.)


The second I ran 

echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level

X froze. 


A rather annoying chain of bugs:

1. I have to set the refresh rate to 59.94hz to stop the screen flickering
(Don't really care about this, I'd happily do this if it was the only issue)

2. It works perfectly with a single display

3. With multiple displays, setting the refresh rate to 59.94 causes the system
to freeze and I have to to a hard reset

4. Points 2 and 3 are only relevant if  power_dpm_force_performance_level is
set to auto.


This is an acceptable compromise for now. The additional temperature/power
usage is far more palatable than the flickering screen or system freezes.

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