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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #14 from Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk> ---
I spent a little bit more time playing with the 3.11-rc2 kernel and I noticed a
couple of things:

1) If I boot in standalone mode with no DisplayPort connector attached, xrandr
shows that I have 3 DisplayPort outputs?! This is definitely not true!

2) Once booted in standalone mode, if I then proceed to plug in the DisplayPort
connector then the kernel throws a backtrace - I'll upload this as a separate
attachment.

My best guess is that the freeze is related to trying to enumerate these
non-existent DisplayPort outputs when starting X. Whereabouts in the code are
these outputs parsed/enumerated?

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