[Intel-gfx] [PATCH] drm/i915: Fix garbage pixels on top of LVDS on IVY laptop

[Daniel Vetter]

On Fri, Dec 07, 2012 at 07:07:32PM +0100, Daniel Vetter wrote:
> On Fri, Dec 7, 2012 at 7:05 PM, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> >> I tried to move the w/a to enable code, but also didn't help.
> >>
> >> So... your guess appears really feasible.
> >> Then this is a side-effect of the new modeset code by optimizing the
> >> enable/disable step?
> >
> > Nope, the commit you've cited is way past the modeset-rework merge.
> > That really just moved the enable/disable points of the w/a bit around
> > to the supposedly correct places. Also, if this w/a fails you're
> > supposed to get a black screen with stuck cpu-side pipe, not a display
> > shifted down a few lines. So something strange seems to be going on.
> 
> Can you please check whether this is a dual-link lvds machine? Some
> other w/a would apply in this case.

Also please retest with latest drm-intel-nightly and the following patch:

https://patchwork.kernel.org/patch/1852411/

Otherwise we might be hitting fallout from know issues.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch