[Bug 41340] vga_switcheroo doesn't work with AMD Radeon HD 6770M

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41340

--- Comment #8 from mlambda at 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?

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