[lucid] Screen randomly goes off (aka IDLETIMER issue)

Binary package hint: xorg

Like bug 397839, I still see randomly this bug, and an icon in notification area appears there is a bug (with a link to a Richard Hughes blog post).
I don't know how to trigger this bug on demand.

ProblemType: Bug
Architecture: amd64
Date: Tue Feb 23 21:31:02 2010
DistroRelease: Ubuntu 10.04
DkmsStatus: Error: [Errno 2] Aucun fichier ou dossier de ce type
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100113)
MachineType: LENOVO 7660RPG
Package: xorg 1:7.5+1ubuntu7
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-14-generic root=UUID=ddc7f73c-27c1-445c-ba5b-db3b6cbc9c0d ro quiet splash
ProcEnviron:
 PATH=(custom, user)
 LANG=fr_FR.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-14.20-generic
RelatedPackageVersions:
 xserver-xorg 1:7.5+1ubuntu7
 libgl1-mesa-glx 7.7-3ubuntu1
 libdrm2 2.4.18-1ubuntu2
 xserver-xorg-video-intel 2:2.9.1-1ubuntu6
SourcePackage: xorg
Symptom: display
Uname: Linux 2.6.32-14-generic x86_64
dmi.bios.date: 05/11/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 7LETC6WW (2.26 )
dmi.board.name: 7660RPG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7LETC6WW(2.26):bd05/11/2009:svnLENOVO:pn7660RPG:pvrThinkPadT61:rvnLENOVO:rn7660RPG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 7660RPG
dmi.product.version: ThinkPad T61
dmi.sys.vendor: LENOVO
system:
 distro: Ubuntu
 architecture: x86_64kernel: 2.6.32-14-generic