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[madbiologist <570589@xxxxxxxxxxxxxxxxxx>]

The currently under-development 3.13 upstream kernel enables DPM by
default (without needing the radeon.dpm=1 boot parameter I mentioned
above) for Radeon HD 4000 through Radeon HD 7000 series graphics
processors but with some specific ASICs being excluded.

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https://bugs.launchpad.net/bugs/570589

Title:
  Lucid: Overheating due to no PM for ATI KMS

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  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.
  --- 
  Architecture: amd64
  DistroRelease: Ubuntu 10.04
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100113)
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=de_AT:de:de_DE:de_CH:de_LU:de_LI:de_BE:en
   PATH=(custom, user)
   LANG=de_AT.utf8
   SHELL=/bin/bash
  Tags: lucid
  Uname: Linux 2.6.34-rc5-klausi x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare tape vboxusers video

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