12.04 - No ACPI support for my PC, what can I do?

  • user31389

    On my new PC something is wrong with ACPI support under Linux. I have to boot it with acpi=off and nolapic. Also it detects only one CPU core (this annoys me the most) and won't shut down completely, I have to hold power button for few seconds to power PC off.

    The question is: what can I do? Edit some config files? Report bugs? Send mails to motherboard manufacturer? Run some utility to help reverse-engineer drivers? (Currently I just turn AMD C1E off in BIOS. It's a nice workaround.)

    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
  • Answers
  • irrational John

    I suggest you start by trying to follow the steps in this guide: DebuggingACPI.

    The description at the top of that page says it is part of Debugging Central, "pages with debugging details for a variety of Ubuntu packages" on the Ubuntu Community Wiki.

    You should also try looking at the entries in /var/log/syslog to see if anything there will help isolate the problem.

    Make sure the portion of the log you look at is from a failed boot. That is, the log entries should be from a boot where neither acpi=off nor nolapic were used. The log timestamps should allow you to determine which boot a log file entry is from.

    If you find it easier to use a GUI application, Ubuntu has a Log File Viewer which you can use. It can be found by searching for it using Dash. Dash icon from my desktop

    The steps below are (pretty much) copied from the DebuggingACPI page and are what I suggest you do to try to isolate the problem before filing a bug report. (I believe the procedures for reporting a bug are also on the DebuggingACPI page)

    If acpi=off allows the system to boot, try to isolate the ACPI issue with the following boot parameters. Remove acpi=off and boot with only one of the options below.

    If you are lucky, you might find a combination of kernel parameters which allows you to boot and use all the cores of your CPU.

    Note: If you need an explanation of to how to do a "one time" change of the kernel boot parameters/options, try this answer to the question "How do I add a kernel boot parameter?".

    • Try booting with acpi=ht
      This disables all of ACPI except just enough to enable Hyper Threading.

      If acpi=off works and acpi=ht fails, then the issue is in the ACPI table parsing code itself, or perhaps the SMP code.
    • Try booting with pci=noacpi
      This disables ACPI for IRQ routing and PCI scanning.
    • Try booting with acpi=noirq
      This disables ACPI for IRQ routing.
    • Try booting with pnpacpi=off
      This disables the ACPI component of the Linux Plug and Play code.
    • Try booting with noapic
      Disables the IO-APIC for IRQ routing or PCI scanning.
    • Try booting with nolapic
      Disables the local APIC.

  • user31389


    There is a better workaround than disabling ACPI (by using acpi=off and nolapic). You can just turn AMD C1E off in BIOS!

    It still is an issue though...

  • Related Question

    can i mess up my hardware with acpi=off or acpi=noirq?
  • cory

    Dell XPS 15z

    Found this: ubuntu hardware support 15z

    Have been able to get ubuntu booted up off usb with acpi=off. My question is, once Ive installed and my boot line includes either 'acpi=off' or 'acpi=noirq' will i ruin my hardware running this as my daily driver?

    being a noob about three years ago i started running backtrack 3,4 on my vostro 1500... and let me tell you, its hardware is COOKED. hence why i had to buy new system. not trying to make same mistake.


  • Related Answers
  • waltinator

    Probably not. See http://www.kernel.org/doc/Documentation/kernel-parameters.txt which says:

    acpi=       [HW,ACPI,X86]
            Advanced Configuration and Power Interface
            Format: { force | off | strict | noirq | rsdt }
            force -- enable ACPI if default was off
            off -- disable ACPI if default was on
            noirq -- do not use ACPI for IRQ routing
            strict -- Be less tolerant of platforms that are not
                strictly ACPI specification compliant.
            rsdt -- prefer RSDT over (default) XSDT
            copy_dsdt -- copy DSDT to memory
            See also Documentation/power/pm.txt, pci=noacpi

    Looks harmless to me

  • cory

    if your machine uses ACPI...

    cat /proc/acpi/thermal_zone/THM0/temperature

    echo level auto > /proc/acpi/ibm/fan

    seems like if no acpi, fan runs full blast, cpu gets hot, and then, i think, non stop hot hardware means less life.