Bug#813661: xserver-xorg-video-intel: severe display corruption on Sandy Bridge

[Julien Cristau <jcristau@debian.org>]

On Thu, Feb  4, 2016 at 01:00:58 -0500, Peter Colberg wrote:

> Package: xserver-xorg-video-intel
> Version: 2:2.99.917+git20160127-1+b1
> Severity: important
> 
> Dear Maintainer,
> 
> Since upgrading to the above version, I am experiencing severe display
> corruption on a Sandy Bridge GPU when using the chromium browser.
> Other graphical applications (xterm, evince, gimp) are not affected.
> 
> The corruption occurs when the window spans the full width of the
> screen, and disappears when reducing the window to half the width.
> (I am using the awesome tiling window manager.) Please see the
> attached screenshots of the full width versus half width case.
> 
> The corruption is transient in nature, i.e., when interacting with
> the window by moving the cursor or entering text into the address bar,
> existing artifacts flicker or vanish and new artifacts emerge. The
> issue is present regardless of whether 2D GPU acceleration is enabled
> or disabled in the browser.
> 
> Downgrading to xserver-xorg-video-intel 2:2.99.917-2 fixes the issue.
> 
> Please let me know how I can help debugging this regression.
> 
Please report this upstream following
https://01.org/linuxgraphics/documentation/how-report-bugs and let us
know the bug number for tracking.

Thanks,
Julien