This doesn't seem to be a problem with Ubuntu/Kubuntu, but something related to Xorg7.1 I guess. I've tried amd64 final versions of Ubuntu/Kubuntu and I am getting the exact same problem with both.
Trying to get rid of this problem, I've finally ended installing Gentoo 2006.1 amd64 on my system. Same problem on this system, and it's completely custom compiled for my system. Synthoms are: Keyboard stops to respond quite often randomly. Multiple repetitions on keyboard input randomly happens. Mouse scroll is sometimes laggy. Ctrl+Alt+F1 works ok. Ctrl+Alt+Backspace works ok. When enabling AIGLX and starting beryl-manager, synthoms become the following: All input devices (keyboard, touchpad and mouse) stop working. Computer is working ok: Processor ok (compiling), Graphics ok (glxgears), Sound ok (amarok playing an mp3 file), internet ok (amsn alerts) ACPI messages are attender: I can safely shut my computer down pressing power button. Any Ideas how to solve this annoying problem? -- Random keyboard failure in X https://launchpad.net/bugs/58884 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
