Comment 5 for bug 818933

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Julian Wiedmann (jwiedmann) wrote : Re: Dell 790 fails to reboot without either reboot=bios or acpi=off

With kernel version 3.0, the reboot mechanism has been modified to match Windows' behaviour more closely (see http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=660e34cebf0a11d54f2d5dd8838607452355f321 ).
Could you give that a try?

There are pre-built kernel packages in the mainline-ppa (currently 3.0.4) at http://kernel.ubuntu.com/~kernel-ppa/mainline and a Live CD for Oneiric's Beta 1 should be available soon as well.