Version: (using KDE KDE 3.5.8)
Installed from: Debian testing/unstable Packages
After switching from Xinerama/Xorg 7.2 to XRandR/Xorg 7.3 for a multi-head setup KDE broke the working XRandR setup when I ran startkde. The problem is the randr-configuration thats stored in startupconfig and has hardcoded values for the screens and their positions. Then during startkde these values are read and set via xrandr and this breaks if something changed in the setup and the user doesn't get notified at all.
In my case the kde startup just disabled the 2nd head.
I can confirm this, using Ubuntu Gutsy, kde 3.5.8
I added my own xrandr commands to xstartup script and it did work for a while but now it seems that startkde somehow disables my second head. Using intel driver and first head is VGA and another is TMDS-1
*** This bug has been marked as a duplicate of bug 131197 ***