[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 #6 from Christoph Haag <haagch.christoph at googlemail.com> ---
Created attachment 117761
  --> https://bugzilla.kernel.org/attachment.cgi?id=117761&action=edit
dmesg with drm-fixes-3.12-radeon-poweroff branch

Hm, I think it kind of works with drm-fixes-3.12-radeon-poweroff.

There seems to be no error in dmesg and X works fine.


I have monitored /sys/kernel/debug/vgaswitcheroo/switch a while.

Unfortunately most of the time it says
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynPwr:0000:01:00.0

I have seen it say
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0
But I don't know really know how I got it to switch and whether it was
something I did at all.

Then, unprovoked, it switched to on ("DynPwr") again.
(There's nothing running on the radeon GPU, only X with xcompmgr on intel and
radeon is configured as provideroffloadsink)


I don't know how to coax it to power the gpu off. But at least it CAN work
already.




Maybe this is useful, maybe not:
With the radeon in idle I have this:
$ cat /sys/kernel/debug/dri/1/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 0    sclk: 30000 mclk: 15000 vddc: 825 vddci: 850 pcie gen: 3

with glxgears I have this:
$ cat /sys/kernel/debug/dri/1/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 2    sclk: 85000 mclk: 120000 vddc: 1050 vddci: 975 pcie gen: 3

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