The open-source Radeon driver has much improved power management in the
linux kernel 3.11 and later. The upcoming Ubuntu 13.10 "Saucy
Salamander" is based on the 3.11 kernel. The new power management
system is disabled by default, pending more testing. To enable it you
will need to select it at boot by adding radeon.dpm=1 to your GRUB
kernel boot options as described at
https://help.ubuntu.com/community/Grub2/Troubleshooting#Editing_the_GRUB_2_Menu_During_Boot
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Fix Released
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which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/1075418
Title:
Radeon HD 6400M/7400M Series
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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/1075418/+subscriptions
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