[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 #25 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 124041
  --> https://bugzilla.kernel.org/attachment.cgi?id=124041&action=edit
just some printk to easily see what's going on

Well, I don't really know how it is supposed to work. I figured the easiest
thing I could do right now was adding some printk() to the code to have an
overview of what is happening in dmesg -H | grep radeonpm.

After booting up with no X I see this:

[  +0,000016] radeonpm: runtime_idle
[  +4,000483] radeonpm: runtime_suspend

After starting X this is added:

[Jan31 19:04] radeonpm: runtime_resume
[  +1,126688] radeonpm: runtime_idle
[  +0,000203] radeonpm: runtime_idle
[  +0,000400] radeonpm: runtime_idle
[  +0,000232] radeonpm: runtime_idle

But then it never does anything again.

After this, I did the usual xrandr --setprovideroffloadsink radeon Intel and
started and exited DRI_PRIME=1 glxgears and stuff, but nothing with radeonpm
was printed to the log again.

After a while I tried exiting X and sure enough, another line:

[  +2,368895] radeonpm: runtime_suspend

And after starting X for the second time:

[ +19,119650] radeonpm: runtime_resume
[  +1,131037] radeonpm: runtime_idle

And then... nothing with radeonpm again. I have read a bit in the
Documentation/power/runtime_pm.txt and maybe I did not catch it but I haven't
really seen when you call pm_runtime_put_autosuspend whether it is supposed to
eventually call back radeon_pmops_runtime_suspend but I would think that's what
it does, right? So that just never happens until X is quit.




After boot with no X running I see this with for i in
/sys/class/drm/card0/device/power/*; do echo "$i: $(cat $i)"; done

/sys/class/drm/card0/device/power/async: enabled
/sys/class/drm/card0/device/power/autosuspend_delay_ms: 5000
/sys/class/drm/card0/device/power/control: auto
/sys/class/drm/card0/device/power/runtime_active_kids: 0
/sys/class/drm/card0/device/power/runtime_active_time: 13260
/sys/class/drm/card0/device/power/runtime_enabled: enabled
/sys/class/drm/card0/device/power/runtime_status: suspended
/sys/class/drm/card0/device/power/runtime_suspended_time: 218426
/sys/class/drm/card0/device/power/runtime_usage: 0
[snipped some wakeup* stuff]

The GPU is off, fan is not running, etc.


After starting X I see this:

/sys/class/drm/card0/device/power/async: enabled
/sys/class/drm/card0/device/power/autosuspend_delay_ms: 5000
/sys/class/drm/card0/device/power/control: auto
/sys/class/drm/card0/device/power/runtime_active_kids: 0
/sys/class/drm/card0/device/power/runtime_active_time: 185230
/sys/class/drm/card0/device/power/runtime_enabled: enabled
/sys/class/drm/card0/device/power/runtime_status: active
/sys/class/drm/card0/device/power/runtime_suspended_time: 226856
/sys/class/drm/card0/device/power/runtime_usage: 0

runtime_status is always active in X...

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