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We need it to restore the ilk rc6 context, since the gpu wait no requires interrupts. But in general having interrupts around should help in code sanity, since more and more stuff is interrupt driven. This regression has been introduced in commit3e9605018aAuthor: Chris Wilson <chris@chris-wilson.co.uk> Date: Tue Nov 27 16:22:54 2012 +0000 drm/i915: Rearrange code to only have a single method for waiting upon the ring Like in the driver load code we need to make sure that hotplug interrupts don't cause havoc with our modeset state, hence block them with the existing infrastructure. Again we ignore races where we might loose hotplug interrupts ... Note that the driver load part of the regression has already been fixed in commit52d7ecedacAuthor: Daniel Vetter <daniel.vetter@ffwll.ch> Date: Sat Dec 1 21:03:22 2012 +0100 drm/i915: reorder setup sequence to have irqs for output setup v2: Add a note to the commit message about which patch fixed the driver load part of the regression. Stable kernels need to backport both patches. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=54691 Cc: stable@vger.kernel.org (for 3.8 only, plese backport52d7ecedacfirst) Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Reported-and-Tested-by: Ilya Tumaykin <itumaykin@gmail.com> Reviewed-by: Chris wilson <chris@chris-wilson.co.uk> (v1) Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>