[Intel-gfx] Sony VAIO VPC-SA2 blinking/waves on LVDS

[Daniel Vetter]

On Mon, Oct 10, 2011 at 09:04:45AM +0200, Daniel Vetter wrote:
> On Mon, Oct 10, 2011 at 03:19:13AM +0400, Олег Герман wrote:
> > I have a VAIO VPC-SA2 laptop, with an Ubuntu 11.04 installed.
> > The problem lies in the strange screen (LVDS 1600x900) blinking/waves
> > ( which is mostly
> > noticeable in grey gradients and causes eyes fatigue and pain after
> > prolonged use.
> > This problem does not occur with the VESA driver, Windows and other
> > outputs, but it's
> > reproduced in Fedora Core and Ubuntu 10.10/11.04/11.10 at X-window and
> > cosole (with i915 module). It is clear that the problem is in the
> > driver, but I can't determine the source of noise, it may be because
> > of the backlight, or the display-panel.
> > 
> > I captured how it looks like
> > http://www.youtube.com/watch?feature=player_profilepage&v=C3LcYLrFwHU
> 
> I'd wager this is dithering gone wrong. Can you boot with drm.debug=0xe
> and attach the full dmesg? Also please attach xrandr --verbose.

Another thing to try is disabling SSC with i915.lvds_use_ssc=0 on the
kernel cmdline.
-Daniel
-- 
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48