I would like to know how do i prevent my Ati card from turning on when i enter on ubuntu 11.10. My bios only lets-me shutdown intel hd card or leave the both on but i want to know if is possbible to completely shutdown without having to access to the bios.( if is possible to turn of without using Vgaswitcheroo even better!)

My system is: Acer 3820tg-- intel core i3 350M, 2.26 Ghz L3, Ati Mobility Radeon HD 5470 up to 2138 MB hyper memory, 13,3" HD LED LCD, 4gb DDR3, SSD corsair 60GB sata 2.

EDIT: I now know what is missing on the answers! I edited /etc/rc.local file and added the next lines:

1. Sleep 3

2. echo ON > /sys/kernel/debug/vgaswitcheroo/switch

3. echo IGD > /sys/kernel/debug/vgaswitcheroo/switch
4. echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

And then save the file and restart. It should be possible to use only the intel card now. By the way, i didn't blacklisted the radeon driver because doing it make my ati card wake up. (use it at your own risk. i only tested in my system)