Wonder if anyone has any ideas. I had an installation of Mandriva 2008 KDE which worked OK as far as powering off was concerned, but just now did a clean install of 2008.1 (leaving /home as it was). Worked fine means that both shutdown now -h resulted in power going off, and also using the kde off button did the same.
Now, it seems to be impossible to powerdown from the keyboard. Previously either the KDE button or shutdown now -h closed the system down in an orderly way and did poweroff.
Now, whatever you do, you end up with just a halted system and then have to use the on-off switch to poweroff. This applies either to shutdown now -h, and also to poweroff invoked as root.
I can't see anything in the bios which has changed - I've disabled and then reenabled ACPI. In the kde control panel, anyone is enabled for powering the machine down.
Its an Asus barebones with AMD processor, if it makes any difference. American Megatrends bios.
Any ideas?
Peter