HI! I use Kubuntu edgy with new kernel (2.6.20-9 from feisty repository) on my HP COMPAQ DC7600. When i click poweroff on my KDE menu, my computer hangs with black screen or with switched off monitor. BUT when i press power button, computer shutdown normal. This appears only with HP COMPAQ computers (I tried on several models). Sorry for my English!
since the power button works, it seems that ACPI and the kerenl are working fine, and perhaps this is an X problem with the distro. Do the various software methods of shutting down work? eg. "init 0" and the halt(8) family of commands?
Please reopen this bug if: - it is still present with kernel 2.6.21 and - you can provide the requested information.