[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 #11 from Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk> ---
I've seen some interesting patches go through the mailing list which I thought
may be related to this bug, so I thought I'd update to 3.6.11-rc2 and see if
there was any improvement.

Unfortunately I am still unable to use the DisplayPort connector in order to
drive an external monitor :(

Just to summarise for those who are interested:

1) My laptop is set so that it is forced to use nVidia graphics adapter, i.e.
the Optimus mode is disabled in the BIOS.

2) If I run Nouveau without anything plugged into the DisplayPort connector on
my laptop, it runs fine.

3) If I connect an external monitor to the DisplayPort connector and reboot
then X freezes upon startup, even before enabling the external display. Under
3.6.11-rc2 I see the following in dmesg:

nouveau E[   PDISP][0000:01:00.0] chid 1 mthd 0x0080 data 0x00000000 0x00005080
0x0000000

4) If I now unplug the DisplayPort connector, I see the following in dmesg:

nouveau E[     DRM] DDC responded, but no EDID for DP-1

5) If I now try and start X again, it still freezes but for less time than
before.

6) Restarting the laptop without the DisplayPort connector plugged in is
required in order for Nouveau to work on the in-built display once again.


Any further debugging information available on request. I have an up-to-date
git tree to which I can temporarily apply diagnostic patches if required.


Many thanks,

Mark.

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