Today I made a fresh install of Ubuntu 12.10.
After having read this thread on phoronix forums about the latest release of the proprietary AMD drivers, I decided (once more) to use the vgaswitcheroo solution.
The vgaswitcheroo module can be used to power off the discrete graphic card and use only the integrated one from Intel. Personally, I don’t have any advantage in using the discrete graphic as the integrated one is enough to play HD video, the most GPU consuming task I ever need.
So I confirm that the solution described in this post still works on 12.10.
I edited the two files, rebooted the notebook… and then there was silence!
As an update to this post, I confirm that using vgaswitcheroo to shutdown the discrete AMD/ATI card on the new Sony Vaio S, works perfectly also in 12.04 (Precise Pangolin).
- Edit the file
/etc/modprobe.d/blacklist.conf (replace “gedit” with your favorite editor):
sudo gedit /etc/modprobe.d/blacklist.conf
- Add the following lines at the end of the file:
- Edit the file
/etc/rc.local (replace “gedit” with your favorite editor):
sudo gedit /etc/rc.local
- Add the following lines just before
chown -R $USER:$USER /sys/kernel/debug
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
After a restart, use this command to verify that the AMD/ATI discrete graphic card has been shutdown:
sudo less /sys/kernel/debug/vgaswitcheroo/switch
Your output should be similar to this:
+ sign indicates that the Integrated card (Intel) is currently in use and the
Off keyword in the
1:DIS: entry indicates that the discrete AMD/ATI card is powered off.
The benefits I’ve noticed when using this setup are:
- The notebook is much less noisy
- The battery lasts longer
- The notebook is cooler