I have the same problem on a Thinkpad x40 using kernel 2.6.15-22-686, kernel 2.6.15-22-386, kernel 2.6.15-21-386 and kernel 2.6.15-20-386. kernel 2.6.15-19-386 and earlier are OK.
I have the same problem on a Thinkpad x40 using kernel 2.6.15-22-686, kernel 2.6.15-22-386, kernel 2.6.15-21-386 and kernel 2.6.15-20-386.
kernel 2.6.15-19-386 and earlier are OK.