The problem also desappears if I deactivate usplash and if I erase 'splash' boot option in kernel. The problem is relationed with graphic driver and splash screen. My graphics card is Radeon 9250 and its optimal driver is "ati" or "radeon" on xorg, and with both of them the problem occur.
-- Kubuntu Feisty crash when rebooting or turning off from KDE session https://launchpad.net/bugs/84527 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs
