From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keith Packard <keithp@keithp.com>
Subject: Re: [PATCH] drm/i915: Revert i915.semaphore=1 default
	from 47ae63e0
Date: Tue, 24 May 2011 11:46:07 -0600
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To: Andrew Lutomirski <luto@mit.edu>
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On Tue, 24 May 2011 13:10:27 -0400, Andrew Lutomirski <luto@mit.edu> wrote:

> I'm getting hangs on my X220 Core i7 laptop as well with 2.6.39 and
> i915.semaphores=3D1.  They're not as reliable -- sometimes the system
> hangs on log in, sometimes after a few seconds, and sometimes it
> doesn't hang.

That's consistent with our theory at least -- lockups caused by GPU/CPU
interactions, which occur far more often with semaphores disabled, but
still occur with semaphores enabled.

We're working on it...

=2D-=20
keith.packard@intel.com

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