There is also another solution to this, so far I find it a bit better.
What you do is:
blacklist video
(add 'video' to /etc/modprobe.d/blacklist)
add nmi_watchdog=0 to /boot/grub/menu.lst in the defopts for kernel, then sudo update-grub.
With ForceEnablePipeA I could not set my brightness correctly (ThinkPad X40). However, with the latter fix mentioned now, that works well, and I no longer suffer from the unreponsive black screen issue.
The glxgears performance is a bit lower than with i810 on 8.04.1, but I guess that's going to improve and besides, glxgears is not a good benchmark :-)
There is also another solution to this, so far I find it a bit better.
What you do is:
blacklist video
(add 'video' to /etc/modprobe. d/blacklist)
add nmi_watchdog=0 to /boot/grub/menu.lst in the defopts for kernel, then sudo update-grub.
With ForceEnablePipeA I could not set my brightness correctly (ThinkPad X40). However, with the latter fix mentioned now, that works well, and I no longer suffer from the unreponsive black screen issue.
The glxgears performance is a bit lower than with i810 on 8.04.1, but I guess that's going to improve and besides, glxgears is not a good benchmark :-)
The fix is from:
http:// ni.imasters. pl/content/ ubuntu- 710-oraz- 804-i-problem- z-zamrażaniem-ekranu