[i845] Screen flashes randomly during use. Reboot necessary.

Binary package hint: xorg

System works normally for a period of time, then some trigger (haven't determined what) causes the screen to start flashing with vertical white bars in the upper right hand corner. I can't switch virtual terminals or interact with the system at all except by pressing the power button. A short press causes the system to power down normally with the monitor properly displaying the Ubuntu shutdown screen.

I didn't have this problem until I upgraded to Lynx. I have tried a fresh install and saw no improvement.

Any help?

--Dave

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic i686
Architecture: i386
CurrentDmesg: [ 32.236014] eth0: no IPv6 routers present
Date: Tue Sep 14 13:47:56 2010
DkmsStatus: Error: [Errno 2] No such file or directory
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release i386 (20100816.1)
MachineType: Equus Computer Systems Nobilis
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-24-generic root=UUID=a33f37eb-2469-49d0-8db6-09957834a0c1 ro quiet splash
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
Symptom: display
dmi.bios.date: 06/05/2002
dmi.bios.vendor: Intel Corp.
dmi.bios.version: LY84510A.86A.0011.P05.0206051658
dmi.board.name: D845GLAD
dmi.board.vendor: Intel Corporation
dmi.board.version: AAA86717-206
dmi.chassis.type: 2
dmi.modalias: dmi:bvnIntelCorp.:bvrLY84510A.86A.0011.P05.0206051658:bd06/05/2002:svnEquusComputerSystems:pnNobilis:pvr:rvnIntelCorporation:rnD845GLAD:rvrAAA86717-206:cvn:ct2:cvr:
dmi.product.name: Nobilis
dmi.sys.vendor: Equus Computer Systems
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-24-generic