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drm/i915: Revert i915.semaphore=1 default from i915 merge

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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.

Semaphores were disabled in a1656b9090 ("drm/i915: Disable GPU
semaphores by default") in 2.6.38 but were then re-enabled (by mistake?)
by the merge 47ae63e0c2 ("Merge branch 'drm-intel-fixes' into
drm-intel-next").

(It's worth noting that the offending change is i915_drv.c, which was
not marked as a conflict - although a 'git show --cc' on the merge does
show that neither parent had it set to 1)

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Lutomirski 2011-05-13 12:14:54 -04:00 committed by Linus Torvalds
parent 26cf46be95
commit 087fbc9962
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_drv.c
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@ -49,7 +49,7 @@ module_param_named(panel_ignore_lid, i915_panel_ignore_lid, int, 0600);
unsigned int i915_powersave = 1;
module_param_named(powersave, i915_powersave, int, 0600);
unsigned int i915_semaphores = 1;
unsigned int i915_semaphores = 0;
module_param_named(semaphores, i915_semaphores, int, 0600);
unsigned int i915_enable_rc6 = 0;