[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 #17 from Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk> ---
(In reply to comment #16)

> I wouldn't worry about that backtrace, it's related to something else I
> think.

Okay, no worries :)

> Would you mind switching to nouveau/master? You can just add it as a remote
> to your current git setup, no need to check out a whole new tree.

Sure. My kernel git repository is exclusively set-up for trying to get DP
working so it's a clone of git://anongit.freedesktop.org/nouveau/linux-2.6.
I'll do a pull on master branch and build that for my next set of tests.

> Could you post a full dmesg from a nouveau/master kernel booted with
> "nouveau.debug=PDISP=debug"? The dmesg that you've already posted seems to
> suggest everything is broken (e.g. PDISP is disabled which is a very bad
> sign).

Alright. I'm not back in the office until next week now, but as soon as I get a
chance I'll try it and upload the dmesg output here.

> Also, to be clear, if you boot with DP plugged in, and start X, then you get
> a hang, right? Does the whole system hang, or just the display? Can you ssh
> in? If you can ssh in, what happens when you try to turn stuff off/on with
> xrandr? (Obviously with DISPLAY=:0 so as to connect to the laptop's X.)

AFAICT it's a full system hang - I haven't tried remote network access, but the
keyboard is totally unresponsive, even to CTRL-ALT-F1 and friends until the
driver times out after about 2-3mins. I'll give the remote access a try next
week though.


Many thanks,

Mark.

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