linux-kernel - Re: i915: RC6 causes sudden shutdowns

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Message-ID: <CAGPN=9T2tSK43NgMA=6T=jUqBnOT-6PXq8FeQXjSgGoDW1==1A@mail.gmail.com>
Date:	Fri, 2 Dec 2011 06:00:09 +0100
From:	Patrik Kullman <patrik.kullman@...il.com>
To:	Andy Lutomirski <luto@....edu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: i915: RC6 causes sudden shutdowns

2011/12/1 Andy Lutomirski <luto@....edu>:
> 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

Well, it's not something I've explicitly enabled.

Is it on by default?

If so, any reason why I wouldn't want to disable it?
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