Same here on Dell Studio 1555 notebook running Ubuntu Maverick x64 with
kernel 2.6.35-22 generic. ATI Mobility Radeon HD 4570. GPU temperature
is around 50 with proprietary drivers and 70 with open source drivers.
My battery life is also taking a massive hit, with the usual 6 hours
down to ~3.5 hours. Don't want to give up the open source driver as the
overall performance is better except for this issue.

-- 
[RV710] With ATI restricted driver deactivated, GPU is overheating
https://bugs.launchpad.net/bugs/488152
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