[Bug 520762] [NEW] broken login screen to KDM after KDE SC 4.4 upgrade

[martind]

Public bug reported:

Binary package hint: kdebase-workspace

After upgrade to KDE 4.4.0 (from KDE 4.3.5) in Kubuntu 9.10, screen goes blank
just before kdm login screen (sometimes it is possible to see login screen for
short moment). It is possible to move with mouse cursor, but it is huge. I
guess screen resolution is down to something like 640x480. Attempting to switch
to ttys show color patterns and system appears to be frozen. It is possible to
reboot with ALT+SYSRQ+B. 

After discussion with others affected on #Kubuntu channel on freenode we found following
workarounds:
- immediate restart of KDM with ALT+E, afterwards it works
- switching to other tty and back to tty7
- using GDM or other login manager instead of KDM
- boot to recovery console and start KDM manually

Things which did not help:
- reinstalling KDM, kubuntu-desktop, xorg-driver-fglrx
- removing/renaming .kde folder

All available updates are applied. After successful login using any of the workarounds ttys remain unusable filled with graphical color stripes garbage. 
This problem was originally reported as https://bugs.kde.org/show_bug.cgi?id=226392 and following on J. Ridell advice I am opening it here. It is obviously not resolved by simple restarting.

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New

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broken login screen to KDM after KDE SC 4.4 upgrade
https://bugs.launchpad.net/bugs/520762
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