Comment 49 for bug 538648

Created an attachment (id=34894)
dmesg with drm.debug=0x04

Forwarding this bug from Ubuntu reporter Chris Jones:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/538648

[Problem]
Flickering screen with lenovo x301 occasionally, limited to the bottom 1/3rd to 1/2 of the screen. Additional reports of the same symptoms on lenovo x200s, G550, and T500. Booting with i915.powersave=0 fixes it for all reporters. When an external monitor is attached the flickering on the LVDS does not occur.

DistroRelease: Ubuntu 10.04
Kernel: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
Architecture: x86_64
xf86-video-intel: 2.9.1
libdrm: 2.4.18
mesa: 7.7.1
Macine: Lenovo x301, Lenovo x200s, Lenovo T500, Lenovo G550

00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
 Subsystem: Lenovo Device [17aa:2114]