[Intel-gfx] I915 regression : black screen at boot / Sandybridge Mobile (GT2)

[Vincent Vanackere]

On Thu, Jan 12, 2012 at 23:24, Jesse Barnes <jbarnes at virtuousgeek.org>wrote:

> On Thu, 12 Jan 2012 23:21:10 +0100
> Vincent Vanackere <vincent.vanackere at gmail.com> wrote:
> > I'm happy to report that this patch indeed fixes the issue for me (tested
> > both on linus' master and drm-intel-next).
> > Note that I had to apply it by hand (the patch was mangled by your mailer
> > ?), therefore I'm resending your fix as an attachment in case other
> people
> > are interested.
> >
> > Many thanks for the quick fix !
>
> Great, thanks for testing.  Your fixed up patch was missing one line
> though, can you re-test with it added?
>
> After the:
>        temp &= ~PORT_TRANS_SEL_MASK;
> you need to also add a:
>        temp |= PORT_TRANS_SEL_CPT(pipe);
>
> in case you end up running the LVDS off of transcoder B.
>
>
Tested with the (attached, hopefully correct) patch and it still works. :-)

Vincent
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