[Bug 374762] [NEW] stray horizontal black lines in multiple apps (firefox, emacs, ...)

[Nathaniel Smith]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I just upgraded from Intrepid to Jaunty. One consequence of the upgrade
was that I'm now seeing some sort of cross-application rendering bug --
horizontal black lines show up in various apps.

To reproduce:
1) Open firefox to a long-ish page.
2) Hold down the "down-arrow" key to scroll downwards.
3) Occasional scattered black lines will appear overlaying the page content.

The lines survive incremental scrolling, but any kind of forced redraw
(another window moving in front of them, scrolling the location where
they appear off-screen and then back again, etc.) gets rid of them.

Observed in firefox (as mentioned above), GNU emacs, and then they
showed up in the Gnome screenshot dialog when I was taking a screenshot
for this bug report too... screenshots attached.

This is on a Thinkpad X60 with Intel 945GM integrated graphics, using
EXA for acceleration. I do not use desktop effects of any sort (plain
ol' metacity). My font hinting is set to use sub-pixel smoothing, "RGB"
order (not VRGB).

I don't know for sure that it's an X server bug, but assigning to
xserver-xorg-video-intel because the corruption seems to occur during
within-server scrolling blits, at least sometimes.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

-- 
stray horizontal black lines in multiple apps (firefox, emacs, ...)
https://bugs.launchpad.net/bugs/374762
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