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I was having some fun at the Gentoo forums, where gentoo users were posting interesting devices of piping commands to. I did:
cat /dev/urandom > /dev/mouse
The mouse cursor began jumping all over the screen, clicking, dragging, etc. It moved my KDE panel around, opened all kinds of windows... at one point I saw a KDE SU password dialog, but nothing was clicked or input. Anyhow, after 20-30 minutes of this behavior, I didn't think it was going to stop anytime soon, so I did a CTRL+ALT+BACKSPACE to shut down X. When I restarted X, I could not su in a terminal window. I tried chrooting with my Gentoo LiveCD and changing the password. It worked on the command line, but when I startx as normal user and try to su, I get "Permission denied." X/KDE is changing my root password when it starts.
What should I do? I can't emerge or write any config files within X, and I have to chroot with the Gentoo LiveCD if I reboot or start X.