Comment 0 for bug 1007508

On my new PC something is wrong with ACPI support under Linux. I have to boot it with acpi=off and nolapic, without any of those two system won't boot. (As a side effect it detects only one CPU core and won't shut down completely, I have to hold power button for few seconds to power PC off.)

My configuration:

    Ubuntu 12.04 (upgraded from 11.10)
    Processor AMD FX(tm)-4100 Quad-Core
    RAM 8,00 GB
    Graphic Gigabyte GV-N56GOC-1GI (NVIDIA GeForce GTX 560)
    Mainboard Gigabyte GA-870A-USB3
    Disk ATA OCZ-AGILITY3 (SSD)

According to https://wiki.ubuntu.com/DebuggingACPI I tried booting it with acpi=ht (also with acpi=ht AND nolapic), but not to avail. Quote: 'If acpi=off works and acpi=ht fails, then the issue is in the ACPI table parsing code itself, or perhaps the SMP code. '

I will also attach files mentioned on the DebuggingACPI wiki page.