[Bug 117131] vga_switcheroo does not switch IGP -> DIS ( IGP == i915 , DIS == radeon )

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=117131

--- Comment #1 from Jason Vas Dias <jason.vas.dias at gmail.com> ---
Next steps: hacking X-Server & kernel drm & dri code to emit more debug log
messages .

Any suggestions as to how to bring up an X-Server on Radeon 8970M card when
Intel i915 IGP is active under Linux 4.5+ ?
I would have thought X-Server v1.18.3 should be capable of detecting if
it needs to use vga_switcheroo and be able to use it automatically by now - 
but apparently not ; and it seems impossible to get the X-Server to work
(via libfb) without doing a vga_switcheroo . 

I think the kernel needs a way of specifying an initial vga_switcheroo/switch 
state at boot, like:
   'vga_switcheroo=DIS:Pwr;IGP:Off'
.

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