[3.3-rc1]radeon 0000:07:00.0: GPU lockup CP stall for more than 10000msec

[Torsten Kaiser]

On Mon, Jan 23, 2012 at 7:01 PM, Torsten Kaiser
<just.for.lkml at googlemail.com> wrote:
> On Mon, Jan 23, 2012 at 5:57 PM, Jerome Glisse <j.glisse at gmail.com> wrote:
>> On Sat, Jan 21, 2012 at 08:03:37PM +0100, Torsten Kaiser wrote:
>>> After updating to kernel 3.3-rc1 I have experienced a lockup of my GPU.
>>> I left my KDE desktop running until the screensaver turned off the
>>> monitors. But on key presses it would not turn back on. Ctrl+Alt+F1 to
>>> switch to another virtual console also did not work.
>>> Alt+SysRq magic still worked, so I was able to force the syslog to
>>> disk and restart the system.
>>>
>>
>> Can you test if attached patch help your case ?
>
> Patch is installed, but I can't reproduce the hang on demand.
> It did happen a second time yesterday while letting the screensaver
> kick in, but only at around the third or fourth try. Just using "xset
> dpms force standby/suspend/off" did not trigger it.

I think the patch did what it was intended to do, but it did not really help.
While the GPU reset did seem to work, X still got stuck and was not
able to turn the monitors back on.