linux-kernel - i915: RC6 causes sudden shutdowns

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Message-ID: <CAGPN=9Q8gB_xsbB1BrMJSo_Qs=7Tu49RX4x3VqNB9adzVdm6kg@mail.gmail.com>
Date:	Thu, 24 Nov 2011 00:43:31 +0100
From:	Patrik Kullman <patrik.kullman@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: i915: RC6 causes sudden shutdowns

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.

It happens both when pcie_aspm=force is supplied and when it's not.
What also is a bit concerning is that I read that RC6 is going to be
enabled by default from 3.2 onward?

How would we go about troubleshooting this?

Or is the only option to blacklist the machine from RC6 if it doesn't
work as is?
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