Bug 28969

Forwarding this bug from Ubuntu reporter :
http://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/599360

[Problem]
After upgrading from lucid to maverick the laptop screen flickers similar to a CRT with a low refresh rate, i.e. fast, small changes in lightness especially visible in gradients. The flickering occurs independently from the chosen display resolution or brightness.

Other observations:
- when I connect an external display via VGA the flickering disappears on both displays
- gnome-display-properties lists the native resolution twice, of which one additionally introduces a pattern of blurred vertical stripes

Hardware:
Thinkpad Edge 15

DistroRelease: Ubuntu 10.10
Package: xorg 1:7.5+6ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-6.7-generic 2.6.35-rc3
Uname: Linux 2.6.35-6-generic x86_64
Architecture: amd64
DRM.card0.DisplayPort.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.HDMI_Type_A.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1366x768
 edid-base64: AP///////wAwrrBAAAAAAAETAQOAIhN46rAln1lWkyYNUFQAAAABAQEBAQEBAQEBAQEBAQEBLBpWRVAACjAgGDQAWMEQAAAYzhVWRVAACjAgGDQAWMEQAAAYAAAADwCLCTKLCSgWCQAGr1YzAAAA/gBCMTU2WFcwMiBWMyAKAPE=
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1440x900 1280x1024 1280x1024 1280x960 1152x864 1152x720 1024x768 1024x768 832x624 800x600 800x600 640x480 640x480 720x400
 edid-base64: AP///////wAi8KImAQEBAQkSAQNoKRp47t6Vo1RMmSYPUFSla4CVAHEAgUCBgAEBAQEBAQEBmimg0FGEIjBQmDYAmP8QAAAcAAAA/QAyTBhTDgAKICAgICAgAAAA/ABIUCB3MTkwNwogICAgAAAA/wAzQ1E4MDkxWDc5CiAgAEc=
Date: Mon Jun 28 15:15:47 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
MachineType: LENOVO 03017VG
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-6-generic root=UUID=a1faef82-1d31-43b2-b12b-19a8db529847 ro quiet splash
ProcEnviron:
 LANG=de_DE.utf8
 SourcePackage: xorg
Symptom: display
dmi.bios.date: 03/24/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 80ET29WW (1.06 )
dmi.board.name: 03017VG
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:bvr80ET29WW(1.06):bd03/24/2010:svnLENOVO:pn03017VG:pvrThinkPadEdge:rvnLENOVO:rn03017VG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 03017VG
dmi.product.version: ThinkPad Edge
dmi.sys.vendor: LENOVO
system:
  codename:           maverick
 architecture:       x86_64
 kernel:             2.6.35-6-generic