I'm using kernel based on linux-source-2.6.20-13.21 and this bug has been fixed. Thanks!
** Changed in: linux-source-2.6.20 (Ubuntu) Status: Confirmed => Fix Released -- Dell Laptop Keyboards never generate key-up event https://launchpad.net/bugs/44154 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs