https://bugs.freedesktop.org/show_bug.cgi?id=98146

--- Comment #6 from Mike Lothian <mike@fireburn.co.uk> ---
An easy way to check it to see if DRI_PRIME=1 glxinfo works without issuing any
xrandr commands

I don't have individual snippits for the drivers only this:

Section "Device" 
        Identifier      "Graphics"
        Option          "DRI"   "3"
EndSection

Also give it a go with the modesetting driver

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