[Intel-gfx] [RFC] Reduce idle vblank wakeups

[Adam Jackson]

On Wed, 2011-11-16 at 09:20 -0500, Matthew Garrett wrote:
> The drm core currently waits 5 seconds from userspace dropping a request
> for vblanks to vblanks actually being disabled. This appears to be a
> workaround for broken hardware, but results in a mostly idle desktop
> generating a huge number of wakeups that are entirely unnecessary but which
> consume measurable amounts of power. This patchset makes the vblank timeout
> per-device rather than global, making it easy for drivers to override the
> behaviour without compromising other graphics hardware in the system. It
> then removes the delay on Intel hardware. I've tested this successfully on
> Sandybridge without any evidence of spurious or missing irqs, but I don't
> know how well it works on older hardware. Feedback not only welcome, but
> positively desired.

Looks good to me.  I'll test this on some other intel kit I've got
handy.  For the series:

Reviewed-by: Adam Jackson <ajax at redhat.com>

- ajax
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