The problem is solved adding the option "notsc" to the kernel boot parameters.
The problem occurs on Core 2 Duo ( merom ) procesors using 64 bits distributions. The solution was posted on the Gentoo forum, http://forums.gentoo.org/viewtopic-t-513939.html In this aspect gentoo comunity is far more proactive than ubuntu one. -- Random keyboard failure in X https://launchpad.net/bugs/58884 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
