Sorry for digging out that thread...
I'm trying to get vga_switcheroo working on my notebook (Debian testing+unstable installed)with:
VGA switcheroo is configured:
lspci | grep VGA
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS880M [Mobility Radeon HD 4200 Series]
02:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Whistler [AMD Radeon HD 6600M Series] (rev ff)
I'm trying to do this:
After that I'm restaring X, but getting just a black screen, then I entering root and root's password, and then reboot.
echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch
Well, here is my Xorg.0.log (from default IGD-session): http://pastebin.com/urC2jd2L.
And here is my Xorg.0.log.old (from trying to switch to DIS session): http://pastebin.com/gs3kUQQC.
Is it my fault or a bug in X/radeon/kernel? What you, guys, can advise me?