Comment 23 for bug 49521

I also have an IBM X41 and when I upgraded from 7.10 to 8.04 this bug appeared. I tried changing power management settings (do nothing, suspend, hibernate etc) but this did not fix it.
I also tried to add 'Option "ForceEnablePipeA" "true"' to xorg.conf, but it did not help. The F1 F7 workaround worked for me, but I had to login again or I lost the wifi connection. What fixed it is running 'sudo dpkg-reconfigure -phigh xserver-xorg' as for the other X41 users.