Comment 12 for bug 104868

I've had the same problem on my ASUS P4B mainboard computer.

It seems that acpi=ht is forced because this mainboard is present. This leads to acpi only be enabled until hyper-threading would be activated.

As my proc won't support hyperthreading, this is not usefull.

I found that only acpi=force would supercede this acpi=ht mode set by the kernel.

So far, adding acpi=force to grub's kernel command-line seems to solve this issue. I hope there won't be any side effects.

Hope this helps.