[Bug 65761] HD 7970M Hybrid - hangs and errors and rmmod causes crash

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https://bugzilla.kernel.org/show_bug.cgi?id=65761

--- Comment #17 from Christoph Haag <haagch.christoph@googlemail.com> ---
It reads /sys/kernel/debug/dri/0/radeon_pm_info once a second and lm_sensors I
think.

Powered down in terms of vgaswitcheroo/dynoff, I don't think so. When X is
running I don't read dynoff for the radeon gpu from
/sys/kernel/debug/vgaswitcheroo/switch but when X is not running, it powers
down.

I checked with radeon-profile because it's actually the fan that is sometimes
annoying to me.
The fan only powers off for seconds before starting to run again, mostly only
up to "level 1" for a while.
But sometimes it runs at high speed for seconds or even minutes for seemingly
no reason and then powers down again.

When monitoring with
sudo sh -c 'while true; do cat /sys/kernel/debug/dri/0/radeon_pm_info; sleep
0.5; done'
I see the same thing. When clicking on an unfocussed window and focussing it
with that, it goes from 

power level 0    sclk: 30000 mclk: 15000 vddc: 825 vddci: 850 pcie gen: 3
uvd    vclk: 0 dclk: 0

to

power level 2    sclk: 85000 mclk: 120000 vddc: 1050 vddci: 975 pcie gen: 3
uvd    vclk: 0 dclk: 0

stays there for ~6 seconds and then goes back to power level 0.


If it was garbage it would be pretty consistent garbage with the gpu
temperature rising pretty much exactly on every of those spike...
If constant polling from /sys/kernel/debug/dri/0/radeon_pm_info or so is
causing it, then the long periods of no spikes when actually doing nothing in X
confuse me.

Currently it's just this situation that the fan keeps going on and off all the
time and I am pretty sure it is on most of the time when I'm doing something,
like clicking things and stuff and when I'm exiting X and see dynoff in
/sys/kernel/debug/vgaswitcheroo/switch then the fan actually stays off (I
think. Going to a tty while X is running in the background does not result in
dynoff)

If there is a better way to find out why the fan doesn't shut off, I'd gladly
investigate.

The code is here, by the way: https://github.com/marazmista/radeon-profile

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