Public bug reported:
As you know the code in Lucid's -32 kernel doesn't have support for
power management on ATI cards with KMS (which is default). This is not a
problem for desktop users, but laptop users with beefy cards may run
into severe overheating issues. I expect the forums to flood with these
problems once lucid is final. I have experienced this on two (laptop)
machines at home: GPU and CPU share a heatsink thus the CPU gets very
hot too when idling. In one case this lead to the CPU (both are C2Ds)
being constantly stuck at 800 MHz a few minutes after booting (Once it
went over 75° or something like that), in the other case the CPU temps
went up to 80° in idle even with the fans at full speed. Switching to
fglrx OR a newer kernel and PM OR UMS and PM fixes this, but I feel KMS
on ATI as a default is a bad decision right now. I hope this gets fixed
with 10.10 as the PM code hits MMs kernel.
Most likely we won't be able to do anything about this bug (unless
there's a kernel upgrade in one of lucid's point releases) so I guess
the purpose of this bugreport is more or less to track this issue during
the development of MM.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Lucid: Overheating due to no PM for ATI KMS
https://bugs.launchpad.net/bugs/570589
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