Comment 13 for bug 182288

Jonathan Thomas, I'm not so sure that the bug has been fixed with 4.1. When I ran KDE4 under Hardy Heron 8.04 and had desktop effects enabled, logging in was never a problem. However, I have found that with Intrepid Ibex 8.10 Beta and KDE 4.1.2, attempting a log-in after a session in which desktop effects have been enabled results in me being completely unable to do anything once having logged in. The only keyboard shortcuts to work are those that reset the X window system, and those that change between using KDM and the command line. In that situation, changing to the command line gives me nothing but a flashing cursor. I am unable to do anything.

After reinstalling,I later found that when having windows effects enabled, sometimes Kubuntu would fail to even get passed the boot screen after the GRUB menu. In order to get passed the boot screen in that situation, I would need to boot into the recovery console then proceed to the 'resume' option.

My system is a Dell Inspiron 1300, with a Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)
display controller. The drivers are all provided by Ubuntu.

I haven't as off yet tried the:
[Compositing]
Enabled=false

workaround that has been suggested but will try to do so soon.