graphics is not updated on a part of the screen dual monitor system

[Harald]

Binary package hint: xorg

Sometimes a part of the screen is not updated in graphic applications like vlc, totem-media-player or open office.

The system is a dual monitor system the most right part is not updated on the right screen.

It seems as if there is a vertical line. the graphics on the left side of the line is updated, the right side is not updated.

Before the screen shot has been taken, the application window - here totem - was moved in several steps from right to left.

This bug might be related to bug 579028.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
Architecture: i386
CheckboxSubmission: 6c1df3001b3f6f37f438c8ca21e697e6
CheckboxSystem: 46feaa48d06cf3e67f2915684d7220e3
Date: Fri May 21 02:31:35 2010
MachineType: To Be Filled By O.E.M. 775Dual-VSTA
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=310bf049-eeb8-4815-a648-15febdef0527 ro splash
ProcEnviron:
 LANGUAGE=en_GB:en
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 12/11/2006
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.40
dmi.board.name: 775Dual-VSTA
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.40:bd12/11/2006:svnToBeFilledByO.E.M.:pn775Dual-VSTA:pvrToBeFilledByO.E.M.:rvn:rn775Dual-VSTA:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: 775Dual-VSTA
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-22-generic

[Harald (hdmuell)]

this bug appears sporadic

[Harald (hdmuell)]

As a workaround I added nomodeset to the kernel parameters.

As the bug came up with Lucid, I give just a short sketch how to solve the problem with gub2. (standard in Lucid)

Edit /etc/default/grub
add the parameter nomodeset to GRUB_CMDLINE_LINUX_DEFAULT. This line is in my configuration now:
  GRUB_CMDLINE_LINUX_DEFAULT="splash nomodeset"

Then run sudo update-grub in a TTerminal

Just to try if it works for your case ye you can edit the entry in Grub once before booting (see instructions at the bottom of the Grub boot menu at boot time) the line to edit is similar to
 linux /boot/vmlinuz-2.6.32-22-generic root=UUID=....... ro splash nomodeset

write nomodeset to the end of this line (as in the line above)

[Harald (hdmuell)]

I got the idea to switch off kernel-based mode setting by the following article:

http://www.h-online.com/open/features/Rock-it-What-s-new-in-Fedora-13-1006388.html (Information that this technique is used in Ubuntu + that it can be switched off)

using nomodeset is also a workaround for Bug: 579028

So my conclusion is that the bug must be somehow related to kernel-based mode setting.

So maybe the package is no longer correct?