Bug#774020: systemd: black screen with backlight on start. rescue mode plus Ctrl-D allows normal boot

[allan]

Interesting development here.  I decided to play with BIOS and shut off a
core or two and try with and without hyperthreading.  Laptop is a Dell
Precision M4500, processor is an i7-740QM, 8GB RAM, boot device is a 240gb
SSD.  Video is nVidia Quadro 1800M.

Single core - boots normally with or without hyperthreading.

Two cores - boots normally with hyperthreading disabled, breaks with
hyperthreading enabled.

Four cores - breaks with or without hyperthreading.

This would lead me to believe the DM is trying to start before video is
initialized since if I shut half the cores off I can get a normal boot.

I could be wrong, but it makes sense to me  :)

Thanks -
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