https://bugs.freedesktop.org/show_bug.cgi?id=41340
--- Comment #8 from mlambda@gmail.com 2011-09-29 13:05:42 PDT --- (In reply to comment #7)
You have a mux-less system which means the radeon card is not actually connected to any physical displays as such there is no way for you to switch to the radeon card with vgaswitcheroo. In order to support mux-less systems the xserver needs support for decoupling display and rendering and the drm needs support for sharing buffers between drivers. This is a large amount of work and probably won't happen in the short term.
I have a BIOS Option "Switchable Graphics Mode":
Fixed Mode - Graphics adapter switch is based on AC/DC transition or user selectable options under OS Dynamic Mode - Seamlessy switch to internal or external graphics adapter based on application needs
If I select "Fixed Mode" the BIOS still enables the Intel graphics even on AC power and vga_switcheroo doesn't work. Does this setting make any difference in principle?