[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 #21 from Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk> ---
Hi Ilia,

I finally managed to get a working network connection on boot, and it looks as
if remote SSH is working. So I asked a friend who is fluent in X to ssh in
remotely and perform some tests :)

Things we found were:

1) On boot dmesg shows "nouveau E[     DRM] DDC responded, but no EDID for
DP-1" in the kernel logfile

2) xrandr -q --verbose works but very slowly; each line is noticeably lethargic
when appearing on screen. This output shows 3 DP outputs, but there is only one
DP connector on the laptop?! The physical ports on the laptop are:

LVDS-1 - on-board LCD screen
VGA-1 - external VGA output (possibly only wired to on-board Intel chip?)
DP-1 - external DP output (wired to NV9 chip only)

3) When manually trying to switch between the LVDS/DP-1 outputs with xrandr
there was a backtrace in the logs from drm_mode_set_config_internal().

I'll attach the related files onto this bug report.


Many thanks,

Mark.

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