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

[Takashi Iwai]

At Sat, 8 Dec 2012 13:01:29 +0100,
Daniel Vetter wrote:
> 
> 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/

Tried that, but didn't help, unfortunately.

> Otherwise we might be hitting fallout from know issues.

Looks so...


Takashi