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I'm using Ubuntu 11.10 without the proprietary driver for ATI video cards and I like very much the performance.

My only need is activate power saving when I use the laptop with the battery. Thanks

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You can also look TLP which has power saving for ATI askubuntu.com/questions/285434/… –  Qasim May 19 '13 at 4:26
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2 Answers

up vote 5 down vote accepted

From this blog

You have two options, both involve editing /etc/init.d/ati-power-save options

gksu gedit /etc/init.d/ati-power-save

First method is called “dynpm” and the second method is called “profile” method.

dynpm method


Dynpm method is more modern and efficient but it might not work with some hardware combinations (like mine for example).

Add these lines:

#!/bin/sh

# ATI power save
echo dynpm > /sys/class/drm/card0/device/power_method

Reboot

Profile method


Power profile method is based on four power profiles you choose manually or at boot time using script like the one we are creating here. You can choose between 1. “default” 2. “auto” 3. “low” 4. “high”.

Add these lines to the file

#!/bin/sh

# ATI power save
echo profile > /sys/class/drm/card0/device/power_method
echo low > /sys/class/drm/card0/device/power_profile

Reboot

Either method


Save the script and make it executable

chmod a+x /etc/init.d/ati-power-save

See the blog for additional details.

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dynpm method made my DELL 1555 laptop fans finally go lower. I use Ubuntu 12.10 & radeon drivers (xorg-edgers version) –  Ronan Apr 7 '13 at 21:52
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You need to execute this command after making the script executable:

sudo update-rc.d ati-power-save defaults 99

It creates the links in /etc/rc?.d required to have it executed at startup.

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