I got a integrated GD, which is Intel, and another discrete GD, AMD Radeon 6490 HD I am using ubuntu 11.10
1st, when I boot into Windows, my GD is indeed AMD Radeon 6490 HD, but when I boot into Ubuntu, it shows that I have AMD Radeon 6470 instead.
2nd, I try most methods only to install driver for my AMD/ATI graphic card. First by jockey(fail, boot with unity 2D instead) and install manually (fail, boot into blank screen).
3rd, I give up using the AMD/ATI graphic card. Then I got a new problem. Both my graphic cards are powered on on startup, which causes my laptop to over heat.
I view the content of
0:DIS: :Pwr:0000:01:00.0 1:IGD:+:Pwr:0000:00:02.0
Then I switch off IGD using
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch and I get
0:DIS: :Off:0000:01:00.0 1:IGD:+:Pwr:0000:00:02.0
But after I reboot, the discrete graphic card is powered on again. How to solve this?