I just tried switching to the nv driver.  Same problem.  I get a blank,
white screen with a large underscore cursor in the upper left hand
corner.  I'm using Kubuntu Fiesty to clarify and I did a little more
testing.  I noticed that when when I'm in the first session I'm using
(:0, vt7), but when I start a "new" session with the switch user feature
it makes the new session (:0, vt9) and skips over 8.  When I logout from
the session on vt9, I get the blank screen.  If I press Alt+F8, the
screen doesn't change at all.  If I press Alt+F9, I get a black screen
instead of white but with the same underscore cursor flashing in the
upper left corner.  If I press Alt+F7, I'm returned to my first session
on vt7 like I stated in the earlier post.  To take this a bit further,
if I switch users twice (start 3 sessions), I will have sessions running
on vt7, vt9, and vt10.  When I logout of vt10, I will be correctly taken
back to vt9, but then a logout from vt9 then takes me to the blank white
screen (that I think is vt8 which has nothing on it) and then I have to
press Alt+F7 to get back to the first (vt7) session.  I do also have to
add that I don't think that it is a good idea to have the switch virtual
terminal shortcuts to just Alt+Fx when from within a KDE session,
Ctrl+Alt+Fx is required to switch terminals (which I can add, if I press
Ctrl+Alt+F8 right now I will get the blank white screen, but I will have
to use just Alt+F7 to get back here).

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Switch User freezes at blank screen
https://bugs.launchpad.net/bugs/112518
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