As stated in the topic, I have the following problem: there're two VGAs in my Lenovo G770 laptop with Ubuntu 11.04, namely Intel Mobile HD and AMD Radeon HD 6650M. And if integrated videocard is working quite fine, the discrete one doesn't work at all. What I try to do, is to make the ati card work, no matter if it will be switchable graphics, or just ati working at its full potential.
I tried proprietary drivers: fglrx, compiling ati's drivers in various ways; standard ubuntu driver. There's no option in BIOS to turn just discrete adapter on, so I got to stick to "switchable". ATI Catalyst does not allow me to switch video adapters while integrated one is active.
Furthest I got myself is working vgaswitcheroo module. But here are some problems too. First of all, it does not respond to
echo DIS command, but does turn the card off with
echo OFF. I figured that all I have to do is
echo DDIS to make delayed switch, and reboot X server to make use of ati adapter. What happens then is black screen, sometimes some of console booting lines are visible; although login screen is loading, but not visible (I can tell by sounds and by shortcuts working, so I can login in blind way). I guess this means that ati card is finally working, but something is wrong with it.
Because of the "black screen" glitch I cannot really even check what card is working.