[Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches

[Nicolas Kalkhof]

Hi Jesse,

I've tried your patch below. It locked up my machine a few seconds after X startup :(.
I didn't use any boot parameter. I've changed the parameters during runtime by echoing sysfs.

I've filed a bug under https://bugs.freedesktop.org/show_bug.cgi?id=38529[../../jump.htm?goto=https%3A%2F%2Fbugs.freedesktop.org%2Fshow_bug.cgi%3Fid%3D38529][../../jump.htm?goto=https%3A%2F%2Fbugs.freedesktop.org%2Fshow_bug.cgi%3Fid%3D38529]. Chris Wilson already proposed a patch that solves the stalling and so far my system runs stable even with SNA enabled in xf86-video-intel.

However now it seems I'm unable to get my framebuffer console back after I bailed out of X. The screen stays black but my system is still responsive via ssh. This happens without your patch. I'll do some more investigation to make sure I didnt introduce this issue.

Thanks and regards,
nic


-----Ursprüngliche Nachricht-----
Von: "Jesse Barnes" <jbarnes at virtuousgeek.org>
Gesendet: Jun 21, 2011 6:55:27 PM
An: "Nicolas Kalkhof" <nkalkhof at web.de>
Betreff: Re: [Intel-gfx] gen6 (SNB) GPU still stalling besides latest patches

>On Tue, 21 Jun 2011 18:12:56 +0200 (CEST)
>"Nicolas Kalkhof" <nkalkhof at web.de> wrote:
>
>> Hi Jesse,
>>
>> thanks for the infiormation. I've switched rc6 off by
>> echo 0 > /sys/module/i915/parameters/i915_enable_rc6
>> this should do it, right?
>> cat /sys/module/i915/parameters/i915_enable_rc6 yields "0"
>>
>> Are you referring to this patch? https://lkml.org/lkml/2011/6/17/371
>> It should be included in kernel 3.0-rc4 and didn't help here :(
>
>So there are actually a few things that could go wrong in this area.
>The problem may be RC6 related, but it could also be turbo related (our
>GPU frequency adjustment code). Can you boot without the module
>parameter and try this patch and see what happens (after a cold boot)?
>
>Thanks,
>Jesse
>
>diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_d
>index 81a9059..3c589cb 100644
>--- a/drivers/gpu/drm/i915/intel_display.c
>+++ b/drivers/gpu/drm/i915/intel_display.c
>@@ -7788,9 +7788,6 @@ void intel_modeset_init(struct drm_device *dev)
> intel_init_emon(dev);
> }
>
>- if (IS_GEN6(dev))
>- gen6_enable_rps(dev_priv);
>-
> INIT_WORK(&dev_priv->idle_work, intel_idle_update);
> setup_timer(&dev_priv->idle_timer, intel_gpu_idle_timer,
> (unsigned long)dev);
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