Bug description:
After a period of usage the screen will go completely black, white or gray* with the X-session keeps running and tapping out of X doesn't work the screen stays the color it is.

It seems to happen more often while watching videos. Enabling or disabling "Desktop effects" in KDE4 has no effect on the frequency of the problem happening. 

The only ways I've found to recover is the trigger a suspend-to-ram or to restart the computer.

*) The color is black most of the time, but other colors like white and gray is also common, when this happens.

System environment:
-- chipset: Intel 945GMA
-- system architecture: 32-bit
-- xf86-video-intel: 2.9.902-1
-- xserver: xorg-server 1.7.3.902-1
-- mesa: 7.7
-- intel-dri: 7.7-1
-- libdrm: 2.4.17-2
-- kernel: linux 2.6.32.3
-- Linux distribution: Archlinux
-- Machine or mobo model: Macbook 1.1
-- Display connector: Built-in LCD-monitor on macbook LVDS?

Reproducing steps:
- Enable KMS.
- Start an X-session with KDE, xfce or another DE/WM
- Use the computer for a while, watch videos, surf the internet etc...
- Observe the screen goes complete black.

Additional info:
- No related info in Xorg.0.log, dmesg, messages.log or .xsession-errors.
i915.modeset is enabled.

Downgrading the kernel to 2.6.31 seems to help but causes X to freeze completely.