Can't login after 4.2 update

[Rex Dieter]

Arthur Pemberton wrote:

> Last time I tried to switch back to nv, i basically couldn't. So if
> that is going to be a suggestion, could some one let me know how to
> disable desktop effects from the command line? KDE simply won't
> startup with nv last time i tried.

edit ~/.kde/share/config/kwinrc to contain:
[Compositing]
Enabled=false

(or remove/rename kwinrc)

-- Rex