[Nouveau] [Bug 56615] [NVD9+optimus] Unable to start X on ThinkPad T420s laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56615

--- Comment #4 from Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk> ---
Okay it seems that the bug is in the control/initialisation of the DisplayPort. 

If I leave the DisplayPort connector disconnected, then I can start X using the
nouveau driver on the in-built LVDS display. If I then connect the DisplayPort
connector, it shows up in xrandr but trying to enable it results in the same
"hang" as trying to boot with the DisplayPort cable connected.

I can try enabling various bits of debugging within the nouveau driver and
report back the results if anyone can point me in the right direction?

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