[Intel-gfx] [PATCH] drm/i915: Revert i915.semaphore=1 default from 47ae63e0

[Andrew Lutomirski]

On Thu, May 19, 2011 at 4:50 PM, Andrew Lutomirski <luto at mit.edu> wrote:
> On Thu, May 19, 2011 at 3:56 PM, Keith Packard <keithp at keithp.com> wrote:
>> On Fri, 13 May 2011 12:14:54 -0400, Andy Lutomirski <luto at MIT.EDU> wrote:
>>
>>> My Q67 / i7-2600 box has rev09 Sandy Bridge graphics.  It hangs
>>> instantly when GNOME loads and it hangs so hard the reset button
>>> doesn't work.  Setting i915.semaphore=0 fixes it.
>>
>> Can you describe precisely what hardware you have? The make and model of
>> the motherboard and the exact model of CPU? I'd like to get this issue
>> resolved for 2.6.40 and need to have a reliable way to reproduce the
>> hang; replicating your hardware may be a good way of doing that.
>

I'm getting hangs on my X220 Core i7 laptop as well with 2.6.39 and
i915.semaphores=1.  They're not as reliable -- sometimes the system
hangs on log in, sometimes after a few seconds, and sometimes it
doesn't hang.

--Andy