Nearly the same here: 
ubuntu-studio-15.04 amd64
After fresh install on partition /dev/sda7 (have multiple other ubuntu 
derivates on sdaX)
and the first boot, the screen hangs in grey as described before for minutes 
until I gave up. CPU consumption varies, but always more than 90%. service 
lightdm restart with no success.
Other boot options from boot-menu (extended, recovery, non-lowlatency) makes no 
difference.
Same with an preinstalled standard ubuntu 15.04 and later installed 
ubuntu-studio packages. 
Installation Date: 20.Sept.2015 all updates installed so far.

Hardware: HP ProBook 450 G1. 2 Displays (second via HDMI 1920x1080),
cordless keyboard and USB2.0 mouse.

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https://bugs.launchpad.net/bugs/1495030

Title:
  lightdm-gtk-greeter hangs, leaving session locked with gray screen

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