[Intel-gfx] [PATCH v2] drm/i915: Fix shifted screen on top of LVDS on IVY laptop

[Daniel Vetter]

On Tue, Dec 11, 2012 at 11:46:29AM +0100, Takashi Iwai wrote:
> The commit [23670b322: drm/i915: CPT+ pch transcoder workaround]
> caused a regression on some HP laptops with IvyBridge.  The whole
> laptop screen is shifted downward for a few pixels constantly.
> The problem appears only on LVDS while DP and VGA seem unaffected.
> Also, the problem disappears once when go and back from S3.
> (S4 resume still shows the same problem.)
> 
> This patch revives the minimum part the commit above dropped.
> For fixing this regression, only the setup of CHICKEN2 bit in
> cpt_init_clock_gating() is needed.
> 
> Signed-off-by: Takashi Iwai <tiwai at suse.de>

Picked up for -fixes, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch