My laptop(Ubuntu 11.04) always have IGD graphics connected, which is believed to be not normal.

However, “echo OFF > /sys/kernel/debug/vgaswitcheroo/switch” can turn it off, which make the machine’s temperature low.

root@computer0OfGod:~/customEmulator# cat /sys/kernel/debug/vgaswitcheroo/switch

0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0

“+” means which one is active

https://help.ubuntu.com/community/HybridGraphics

http://askubuntu.com/questions/21455/how-to-manage-two-video-cards-on-a-laptop-ati-and-intel

http://zhyu.me/linux/ubuntu-disabled-independent-graphics-card.html

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