[Bug 64332] [HD Graphics 4000] Garbage on screen on Samsung NP900X3E-A02

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64332

--- Comment #10 from murmlos at gmail.com ---

No, Windows does not generate these artifacts. So yes its only the linux driver
that causes this.

Lowering the resolution in general does not help. However when i tried 640x480
i waited almost 15 minutes and no artifact had appeared. When switching to
something higher like 1024x768  the lines appeared almost instantly. 

I have tried the drm-nightly and it does not help :/ 


(In reply to comment #9)
> This is for Urs, murmlos, and cpcpcp:
> 
> (In reply to comment #0)
> > move with it or disappear. Strangely, if a line was present for long, it can
> > "stay" on the screen across reboots, being even visible in BIOS and in
> > Windows 8 if I reboot in the other OS. Turning the machine totally off and
> > letting it like that for a long time makes the artifact disappear.
> 
> Does booting to Windows ever cause the lines to appear if they were not
> previously present? I.e. is it only the Linux driver that makes them show
> up, or not?
> 
> > Starting the machine with kernel option noreboot (and also noacpi) makes the
> > bug disappear. (Xorg starts using the FBDEV vesa driver)
> 
> Does using a lower resolution help?
> 
> 
> Please try the drm-intel-nightly branch of
> http://cgit.freedesktop.org/~danvet/drm-intel/ - specifically I'm wondering
> if
> 
> commit a65851af59387146a28a928c3e7bb17dabc5db72
> Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Date:   Tue Apr 23 15:03:34 2013 +0300
> 
>     drm/i915: Make data/link N value power of two
> 
> might help this.

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