Bug 24399

Forwarding this bug from Ubuntu reporter Philip Falkner:
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/446425

[Problem]
After upgrading to mesa 7.6 (from a mesa git snapshot from mid-August), 1-pixel wide artifacts are displayed on the screen.  These disappear on screen repaints.

[Original Description]
Starting today, Oct 8, with Kwin compositing active, I get 1-pixel wide artifacts all over the screen.  When a window disappears, the very right-most and bottom-most lines of it remain.  Sometimes when scrolling in Konqueror, a line from somewhere else in the web page will "stick" at the bottom of the web view (above the status bar).  The bouncy cursor icon when launching a new application leaves bits of itself behind.

All of these artifacts disappear when that part of the screen is repainted (e.g. moving a window over the area, activating the present windows effect).

Didn't happen before rebooting this morning, so I'm suspecting mesa 7.6.0.

Architecture: i386
Date: Thu Oct  8 11:18:00 2009
DistroRelease: Ubuntu 9.10
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 002: ID 045e:0039 Microsoft Corp. IntelliMouse Optical
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Package: xorg 1:7.4+3ubuntu5
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-12-generic root=UUID=ec6a699c-8cb8-4ef4-b5c9-b83c28ba7696 ro quiet splash
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_CA.UTF-8ProcVersionSignature: Ubuntu 2.6.31-12.41-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu5
 libgl1-mesa-glx 7.6.0-1ubuntu1
 libdrm2 2.4.13-1ubuntu1
 xserver-xorg-video-intel 2:2.8.1-1ubuntu3
 xserver-xorg-video-ati 1:6.12.99+git20090825.fc74e119-0ubuntu3
SourcePackage: xorg
Uname: Linux 2.6.31-12-generic i686
XorgConf: Error: [Errno 2] No such file or directory: '/etc/X11/xorg.conf'
XsessionErrors: (<unknown>:1648): Gdk-CRITICAL **: gdk_window_get_origin: assertion `GDK_IS_WINDOW (window)' failed
dmi.bios.date: 07/16/2003
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: 6.00 PG
dmi.board.name: GA-8S650GXM
dmi.board.vendor: Seanix
dmi.chassis.type: 3
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvr6.00PG:bd07/16/2003:svn:pn:pvr:rvnSeanix:rnGA-8S650GXM:rvr:cvn:ct3:cvr:
glxinfo: Error: [Errno 2] No such file or directory
system: architecture:       i686kernel:             2.6.31-12-generic