[Bug 106271] Switch between AMD hybrid graphics (HD 8650G / HD 8970M) makes hardware reset.

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=106271

Lukas Wunner <lukas at wunner.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lukas at wunner.de

--- Comment #3 from Lukas Wunner <lukas at wunner.de> ---
The pitcairn GPU says "No connectors reported connected with modes". I suppose
that's the discrete GPU?

Does this machine have a hardware mux at all? If not, the discrete GPU can only
be used to offload rendering and switching won't work. I guess the only thing
that can be improved in this case is to make radeon_atpx_switchto() a no-op on
muxless machines.

If on the other hand the machine *does* have a mux, the question is why the
pitcairn GPU didn't find any modes. Are there none in VBT? If so, the issue can
probably be solved by temporarily switching DDC to the discrete GPU on probe.
I'm working on patches to do that with apple-gmux on the MacBook Pro.

-- 
You are receiving this mail because:
You are watching the assignee of the bug.