F22/F23 KDE/Plasma freeze after login.

[linux guy]

Long time Fedora user, since RH8.

I upgraded my main workstation from F21 to F22.  F21 was totally stable and
great.  F22 has been nothing but trouble.

The main issue I have is session freezing that appears to happen right
before the KDE (Plasma) desktop is displayed.  I have this problem with
both nVidia and nouveau drivers.

The kernel seems to run fine.  I can ctrl alt F3 and start a console
session and it runs fine.  But I can't get a KDE (Plasma) session to run at
all.

How do I troubleshoot this ?
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