Version: unspecified OS: Linux PC with K9MM-V mainboard video Unichrome S3. With Gnome eiteher with Mandriva or Kunbutu, no problem. With Kunbutu or Mandriva KDE4, no loging possible:the system return always to log screen. To fix the problem, start under Gnome and remove 3D video effect; restart under KDE4. A strange thing is that with PC_LINUX (KDE4)there is no problem. Reproducible: Always Steps to Reproduce: Always with my PC and video Unichrome S3, with live CD or with OS on hard disk Actual Results: Unable to log or start the system Bug only with S3 Unichrome video.
This is a problem with the Unichrome graphics drivers that KDE triggers. You should report this to your distro, so that they can forward this on to the driver developers.