linux-kernel - Re: i915 freakout with latest 3.7 git

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Date:	Tue, 04 Dec 2012 23:09:58 +0100
From:	Lekensteyn <lekensteyn@...il.com>
To:	Heinz Diehl <htd@...tha.org>
Cc:	dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Heinz Diehl <htd@...cy-poultry.org>
Subject: Re: i915 freakout with latest 3.7 git

On Tuesday 04 December 2012 22:08:45 Heinz Diehl wrote:
> Ok, but in comment 11 in the same thread you mention that reverting
> this patch didn't fix the issue for you:
> 
> "Reverting that commit on top of 3.7-rc4 did not fix the hang issue."
The bisected commit was from between rc2 and rc3:
$ git describe 504c7267a1e84b157cbd7e9c1b805e1bc0c2c846
v3.6-rc2-88-g504c726
The fact that reverting that commit does not help implies that some commits 
thereafter also expose the bug.

> > i915.i915_enable_rc6=0 worked for me, if it does not work for you, then
> > you  probably hit another bug.
> 
> I have now i915.i915_enable_rc6=0 in grub.cfg and disabled the XFCE
> compositor. Now I'm trying to hit the bug again...
Do you have a reliable reproduce method? As you can see in the linked bug it 
was caused by relatively low memory pressure combined with high I/O (caching? 
delays? Who knows).

> A shot in the dark: could it be that all the machines wich encounter
> this hang have nvidia's optimus? Mine has. Could that somehow be
> related? (I'm by no means a programmer or a kernel hacker..).
It is unlikely that Optimus has anything to do with this.

Peter
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