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This project enables Linux to take advantage of platforms supporting Advanced Configuration & Power Interface -- virtually all high-volume i386, x86_64, and ia64 systems since 1999. ACPI, known as a Hardware Abstraction Layer (HAL) in embedded computing, is an abstraction layer between the operating system, platform firmware and hardware. This allows the OS and the platform to evolve independently. The core of the Linux ACPI implementation comes from ACPICA (ACPI Component Architecture). ACPICA includes an ACPI Machine Language (AML) interpreter that is resident in the Linux kernel. Several other operating systems use the same ACPICA core interpreter, including BSD and OpenSolaris. ACPICA also comes with a simulator, test suites, and a compiler, to translate ACPI Source Language (ASL) into AML.

The Linux/ACPI community makes active use of bugzilla.
Note that this database is for kernels only.

If an issue is specific to a distribution, it should be filed in their database. If a sighting appears in both, please cross-reference it using a complete URL.

For either or Linux distributor bugzilla, cc: on bug reports involving Linux ACPI. You can subscribe to this list to see all ACPI bugzilla updates:
Note that this list is intended for bugzilla machine-generated messages only.

If the distribution bug report is private, due to being on pre-production hardware and you want Intel's Linux ACPI team to know about it, then cc:

Sometimes you'll see check-in comments, including reference to small bugzilla numbers, such as BZ 123. These refer to a bugzilla database inside Intel, where ACPICA issues are tracked that don't apply directly to the Linux kernel and thus would not fit within the charter of

While discussion-oriented issues are best dealt with on the list, bugzilla has two useful properties:

  • you can attach a whole bunch of stuff there without irritating everybody on the list, including items > 100KB.
  • bugzilla never forgets, so your issue will not get lost in the shuffle of e-mail overload.

Sometimes it works well to file the supporting debug output for your issue in bugzilla, and then refer to it on the list.

Please be sure to answer these questions when you submit the bug, so they don't have to be asked later:

  • Exactly what kernel version does this bug appear in?
  • Does it still appear in the latest version?
  • Is this a new problem (a regression) or has this problem always existed in every version of Linux tested?
  • If this is a regression, what is the latest version of the kernel where it does not happen? If you have a git tree, can you, using git-bisect, isolate the regression to a particular commit?
  • For the latest working, and for the failing kernel, please _attach_ (do not paste) the complete output from dmesg -s64000 or serial console capture with "debug" on cmdline, if possible.
  • If it is an interrupt-related problem, please paste a copy of /proc/interrupts showing, if possible, both the success and failure case. Also, include the full output from lspci -vv.
  • Please attach the complete, unprocessed output from acpidump. acpidump is available in /usr/sbin, or in the latest PMtools here:
    Note that acpidump is a BIOS image. It will not change with different kernel parameters. However, it will change when you install a different version of the BIOS.
  • If this turns out to be a platform-specific issue, where we may have to blacklist the machine to enable a workaround, please include the output from dmidecode.