This was an underrun associated with FBC, and fixed by correcting the WM
values.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/658705
Title:
Lower part of the screen gets disrupted occasionally
Status in “xserver-xorg-video-intel” package in Ubuntu:
Fix Released
Bug description:
The lower part of the screen gets scrambled / distorted sometimes.
This happens very randomly, but not very often. This disruption just
disappears either after a few seconds or always, when the mouse is
moved or any key pressed. Everything is immediately back to normal
then. The last time it occured was today, just a few seconds after
login, while gnome-terminal and firefox open.
This is a Lenovo G550 Laptop. Lucid 10.04 clean installed in April.
The problem occures from that time on until now. I tried newer
kernel.org kernels and the situation does not change. It seems to be a
X.org or Gnome problem.
I was able to take a photo with my phone a while back:
http://web.student.tuwien.ac.at/~e0525417/screen.jpg
part of "lspci":
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
Controller Hub (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 09)
I could not find useful information in /sys/kernel/debug/dri/0/
I have Compiz enabled.
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Architecture: i386
DistroRelease: Ubuntu 10.04
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Release Candidate i386
(20100419.1)
MachineType: LENOVO 2958
NonfreeKernelModules: wl
Package: xserver-xorg-video-intel 2:2.9.1-3ubuntu5
PackageArchitecture: i386
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-25-generic
root=UUID=2da4676f-b2ae-44f4-883d-c2057d6e2090 ro
ProcEnviron:
LANG=de_AT.utf8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-25.44-generic 2.6.32.21+drm33.7
Tags: lucid lucid
Uname: Linux 2.6.32-25-generic i686
UserGroups: adm admin cdrom dialout disk lpadmin plugdev sambashare
dmi.bios.date: 09/18/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 18CN37WW(V2.10)
dmi.board.name: NITU1
dmi.board.vendor: LENOVO
dmi.board.version: REFERENCE
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnLENOVO:bvr18CN37WW(V2.10):bd09/18/2009:svnLENOVO:pn2958:pvrLenovoG550:rvnLENOVO:rnNITU1:rvrREFERENCE:cvnNoEnclosure:ct10:cvrN/A:
dmi.product.name: 2958
dmi.product.version: Lenovo G550
dmi.sys.vendor: LENOVO
glxinfo: Error: [Errno 2] No such file or directory
system:
distro: Ubuntu
codename: lucid
architecture: i686
kernel: 2.6.32-25-generic
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