While analysing this problem dont't forget that vga16 and nvidia (and
other graphic drivers) are sharing the same primary frame buffer device
"/dev/fb0"
(https://bugs.launchpad.net/ubuntu/+source/upstart/+bug/459639/comments/52).

Vga16 is the first available graphics driver at boot time, and will be
replaced by other graphic drivers later on.

In kdm.conf the watched event "graphics-device-added fb0
PRIMARY_DEVICE_FOR_DISPLAY=1" isn't secure if a 2nd graphics driver is
used.

To fix this, a new event should be emitted from all graphics drivers or
from upstart or from udev or ... as start condition for kdm.conf. And
upstart must know if there is any other graphics installed beside vga16
(ok, typically on every home and business pc, but what's about small
systems and servers).

-- 
X server starts randomly in failsafe when starting from cold boot
https://bugs.launchpad.net/bugs/459639
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