Screen corrupted every 215th pixel

Oldřich Jedlička at
Tue Jan 4 12:25:35 PST 2011

On Monday 03 January 2011 22:13:23 Oldřich Jedlička wrote:
> Hi all,
> I have a really strange problem. I have every 215th column (in pixels)
> corrupted - when I draw two vertical lines with 214 pixels in between in
> Gimp and move the window on the desktop to the specific position, I don't
> see any line (the column is filled with the background color). I see the
> problem in both KDE applications and in Gimp (Gtk application), so I think
> this isn't a toolkit problem. When I move any window, I see something like
> "missing" columns clearly (text has no vertical line, icons miss/repeat
> one column).
> It starts on the 214th column (counted from 0) and after every 215 pixels I
> see the problem.

Hi again,

I've found one component which makes a difference - kernel. When I boot with 
2.6.36 (compiled from former radeon-testing branch), everything looks good, 
when I boot into 2.6.37, I see the corruption. I will investigate the source 
of the problem and raise a bug report when I know more. The version either is 
the direct source or it triggers some feature that makes problems.


> I cannot attach a screenshot, because screenshot taken with
> Ctrl+Printscreen shows no problem.
> It looks like the screen is split into stripes with 215 pixels (plus minus
> pixel) and every one has somethinh like off-by-one problem.
> I'm using this software:
> xorg-server-
> mesa Git master (r600 gallium driver)
> libdrm Git master
> xorg-video-ati Git master
> kernel 2.6.34-rc5, drm-next branch from airlied/drm-2.6.git
> qt-4.7.1
> kde-4.6-rc1
> gtk+-2.22.1
> Does anybody know where the problem could be?
> Thanks,
> Oldrich.
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