linux-kernel - Re: GPU hung with Linux-3.2-rc6

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Date:	Wed, 21 Dec 2011 22:26:26 +0100
From:	Udo Steinberg <udo@...ervisor.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: GPU hung with Linux-3.2-rc6

On Wed, 21 Dec 2011 12:00:37 -0800 Keith Packard (KP) wrote:

KP> On Wed, 21 Dec 2011 19:54:10 +0100, Udo Steinberg <udo@...ervisor.org> wrote:
KP> > Hi,
KP> > 
KP> > With Linux-3.2-rc6 I'm frequently seeing GPU hangs when large amounts of
KP> > text scroll in an xterm, such as when extracting a tar archive. Such as this
KP> > one (note the timestamps):
KP> 
KP> Can you try with semaphores disabled?
KP> 
KP> i915.semaphores=0

That makes the problem go away. If you need more help tracking down the
problem, then let me know. I can reproduce it fairly easily with something
as simple as:

	while true; do dmesg; done

KP> And, you should be able to remove the explicit rc6 argument now; if it
KP> will work, the kernel should turn it on automatically.

Ok.

Cheers,

	- Udo

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