Comment 104 for bug 145377

I have this problem with a Lenovo Thinkpad T60.
I am using Hardy and the latest ati driver (fglrx version 8.5)

Passing of options to the kernel at boot as suggested above and on the wiki did not work for me.
A couple of things did have an effect however:

1) If I use Openbox as my window manager/desktop rather than gnome
the number of Rescheduling interrupts is heavily reduced at least until a graphics intensive program is launched. The strong reduction is also apparent if I log into a bare terminal instead of gnome. This suggests that X or fglrx is misbehaving

2) If I upgrade my kernel to the kernel-ppa (launchpad) 2.6.25 the number of Rescheduling interrupts drops hugely (to 20 per second for normal use). Unfortunately with this kernel my wireless card does not work (problem with iwl3945) nor does sound.... I tried compiling my own version of this kernel (2.6.25.2) with identical results.

So given that the 2.6.25 kernel appears to solve this problem I strongly suspect a kernel scheduling problem in the standard hardy kernel.