Trouble using g-c-m in Ubuntu trusty

[Pedro Côrte-Real <pedro pedrocr net>]

I tried to calibrate my screen today with g-c-m 3.8.3 as packaged by
Ubuntu trusty (14.04). I found a minor bug and a show-stopper. I'm
using a Color Munki to calibrate the internal display on a Lenovo x230
IPS panel.

Minor: The image that is shown to ask the user to put the Color Munki
in screen calibration mode is wrong. It's the same image as is shown
to put the munki in self-calibration mode (the calibration head facing
45 degrees forward) instead of the correct placement (the calibration
head facing down).
Show-stopper: When the profiling ends g-c-m is stuck. Opening the
console shows that the calibration has ended and the device can be
removed from the screen. However g-c-d doesn't seem to be able to
figure that out.

I then upgraded colord (from 1.0.6 to 1.0.7), gnome-color-manager
(from 3.8.3 to 3.8.4) and argyll (from 1.5.1 to 1.6.3) using Pascal's
PPA. After the upgrade the minor bug was still present but the
profiling now worked. The argyll upgrade also brought in console kit.
The upgraded version also started asking for the LCD backlight type.
That isn't in the 3.8.4 changelog so I assume it has something to do
with the upgraded argyll.

Looking through the Ubuntu bug reports it seems to be this bug:

https://bugs.launchpad.net/ubuntu/+source/gnome-color-manager/+bug/1310388

It seems to be an argyll issue indeed.

Cheers,

Pedro