Comment 18 for bug 17763

I'm suffering the same probs as well.
I am running 32 bit version of kubuntu with standard kernel, lm-sensors are installed but it still happens without.
I can sometime restart x-server with ctrl-alt-back but i usually end up with no screen output at all and moniter shuts down.
If i press off button (not reset) logoff splash then shows and comp shuts down normally.
If Juk is playing sound still plays.
It's not frozen when watching tv (using kaffeine with win nova tv card).
It usually occurs if i haven't moved mouse for 20-30 mins with or without screen saver running. (not had a single lock up while using computer.)
Ran memory test and found no problems.
Have not installed any desktop effects beryl or compiz and am running nvidias latest drivers.(3d enabled)
System is Amd x2 939 3800+ Sparkle 7950gt 2 gig pny duel channel DDR400 win nova t digital tv card Primary drive western digital 300 gig sata2 Back up drive 160 gig ide maxtor
Processor temps are cool at 25 - 40 degrees graphics card runs about 70 degrees.
This is also a clean install not upgrade (also had simaler problem in dapper and edgy but not as frequent.