drm/i915: Fix sync to vblank when VGA output is turned off
 

Alberto Milone wrote:
> Hi all,
>
> SRU Justification:
>
> The problem described in this email was reported in a private OEM bug report
> for Dell and has been solved by upstream. It's a regression in the drm code
> which causes a massive system slowdown if we turn off the VGA output.
>
> The patch is sane and minimal and is available in the drm-intel branch and in
> the linux-next branch (see the link to the commit in the bug report).
>
> I have applied (and slightly adapted, as it didn't apply cleanly to our lucid
> and karmic git branches) and tested the patch successfully in Karmic.
>
> The integration of this patch is very important for our Dell projects and for
> the Ubuntu desktop at large.
>
> Please include the attached patch in both Karmic and Lucid ASAP.
>
> Bug #494461
>
> Thanks in advance for your time.
>
> Regards,
>
>
Ok, thanks Alberto. I applied the patch now for Karmic. For Lucid it hopefully
gets down from stable, but we / you probably should keep an eye on it for before
the release.

-Stefan

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