[Bug 207183] radeon.dpm=1 with second monitor runs hot

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207183

--- Comment #6 from Alex Deucher (alexdeucher at gmail.com) ---
(In reply to Erik Huelsmann from comment #5)
> Is the fact that it's apparently not possible to switch the memory clock
> with 2 monitors attached a design error in the hardware? Unfortunately, I
> don't have the Windows setup anymore to investigate it.
> I'm extremely happy with my 'radeon.dpm=0' setup, because I'm only doing
> text-editing, programming and web browsing.
> 

The GPU dynamically changes the memory and gfx engine clocks at runtime based
on GPU load.  Unfortunately if changed the memory clock dynamically you'd see
flickering almost every frame if the GPU load changed.

You can manually force the clocks low or high via sysfs (as root):

force clocks low:
echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level
force clocks high:
echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
dynamic:
echo auto > /sys/class/drm/card0/device/power_dpm_force_performance_level

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