Previously I asked about the same problem in Ubuntu 11.04 with messed up drivers, but now I completely reinstalled system and updated it to latest 11.10.
Last time, I tried using various drivers for discrete video adapter, and thus messed up whole driver system and X server. As was proposed in answer to my previous question, I installed all anew, and of course, I did not install any drivers for any cards.
Ubuntu 11.10 starts okay, with Integrated card on, like 11.04 did. Vgaswitcheroo has the same problems, though: it switches off discrete card power okay, but does not make it work as main card (by echoing
DIS to it). And echoing
DDIS to it, and then restarting X server results in black screen with some console lines in it, or in completely black screen.
I did not install fglrx, ati driver or any third-party software to manipulate gpu states, because I am afraid of doing something more complicated again. So, my question is following: what else can I try to do to make the radeon work? What software could help? Is there a way to completely switch off Intel card and reinstall Ubuntu this way, so it would regard Radeon as single card without any hybrid modes?
Thanks in advance!