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Date: Thu, 01 Dec 2011 14:45:51 -0800
From: Andy Lutomirski <luto@MIT.EDU>
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To: Patrik Kullman <patrik.kullman@gmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: i915: RC6 causes sudden shutdowns
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On 11/23/2011 03:43 PM, Patrik Kullman wrote:
> Hi,
> 
> I recently acquired the Asus Zenbook UX31E but have been looking for
> ways to extend the battery life.
> 
> I read that the i915_enable_rc6 parameter could decrease power usage
> significantly and tried it with the 3.1.1 and 3.1.2 kernels, and
> indeed it does.
> However, I (and the other Zenbook-owners from the Ubuntu forums)
> experience sudden, unexpected shutdowns (for me, 1-4 times per day)
> with this parameter.
> It's as sudden as a power loss.

Do you have DMAR enabled?  If so, it's a known problem and it's being
worked on (and the default will not change for you AFAICT).  If not, you
should send a bug report to the intel-gfx -- several people there care
about this.

--Andy