ACPI modules

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zh-CN:ACPI modules From ACPI site:

ACPI (Advanced Configuration and Power Interface) is an open industry specification co-developed by Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba.

ACPI modules are kernel modules for different ACPI parts. They enable special ACPI functions or add information to /proc or /sys. These information can be parsed by acpid for events or other monitoring applications.

Which modules are available?

This is a small list and summary of ACPI kernel modules:

  • ac (power connector status) => autoloaded during boot initscripts-0.8-7!
  • asus-laptop (useful on ASUS/medion laptops)
  • battery (battery status) => autoloaded during boot initscripts-0.8-7!
  • bay (bay status)
  • button (catch button events, like LID or POWER BUTTON) => autoloaded during boot initscripts-0.8-7!
  • container (container status)
  • dock (docking station status)
  • fan (fan status) => autoloaded during boot initscripts-0.8-7
  • i2c_ec (EC SMBUs driver)
  • ibm_acpi (useful on IBM laptops) (thinkpad_acpi since 2.6.22)
  • processor (processor status) => built into kernel!
  • sbs (smart battery status)
  • thermal (status of thermal sensors) => built into kernel!
  • toshiba_acpi (useful for Toshiba laptops)
  • video (status of video devices)

complete list of your running kernel:

$ ls -l /usr/lib/modules/$(uname -r)/kernel/drivers/acpi
total 112
-rw-r--r-- 1 root root  2808 Aug 29 23:58 ac.ko.gz
-rw-r--r-- 1 root root  3021 Aug 29 23:58 acpi_ipmi.ko.gz
-rw-r--r-- 1 root root  3354 Aug 29 23:58 acpi_memhotplug.ko.gz
-rw-r--r-- 1 root root  4628 Aug 29 23:58 acpi_pad.ko.gz
drwxr-xr-x 2 root root  4096 Aug 29 23:59 apei
-rw-r--r-- 1 root root  7120 Aug 29 23:58 battery.ko.gz
-rw-r--r-- 1 root root  3700 Aug 29 23:58 button.ko.gz
-rw-r--r-- 1 root root  2181 Aug 29 23:58 container.ko.gz
-rw-r--r-- 1 root root  1525 Aug 29 23:58 custom_method.ko.gz
-rw-r--r-- 1 root root  1909 Aug 29 23:58 ec_sys.ko.gz
-rw-r--r-- 1 root root  2001 Aug 29 23:58 fan.ko.gz
-rw-r--r-- 1 root root  1532 Aug 29 23:58 hed.ko.gz
-rw-r--r-- 1 root root  3241 Aug 29 23:58 pci_slot.ko.gz
-rw-r--r-- 1 root root 17742 Aug 29 23:58 processor.ko.gz
-rw-r--r-- 1 root root  3073 Aug 29 23:58 sbshc.ko.gz
-rw-r--r-- 1 root root  7098 Aug 29 23:58 sbs.ko.gz
-rw-r--r-- 1 root root  6311 Aug 29 23:58 thermal.ko.gz
-rw-r--r-- 1 root root  8891 Aug 29 23:58 video.ko.gz

How to select the correct ones

You have to try yourself which module works for your machine:

# modprobe <yourmodule>

then check if the module is supported on your hardware by using

$ dmesg
Tip: It may help to add a grep text search to narrow your results.
$ dmesg | grep acpi
[    0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x04] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x05] enabled)
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1])
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0x02] high edge lint[0x1])
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0x03] high edge lint[0x1])
[    5.066752] ACPI: acpi_idle yielding to intel_idle
[    5.438998] acpi device:04: registered as cooling_device4

Add the working ones to files in /etc/modules-load.d

On laptops, basically these ones should work:

  • ac
  • battery
  • button
  • fan

On desktops/servers, this one should work:

  • button

Getting Information

To read out battery information you can simply install package acpi in Official Repositories and run:

acpi -i

Using /proc to store ACPI information has been discouraged and deprecated since 2.6.24. The same data is available in /sys now and interested parties can (should) subscribe to ACPI events from the kernel via netlink.E.g for battery:



DSDT fix

If problems with power management persist despite having loaded the proper modules, a Linux-unfriendly DSDT might be the cause. See the wiki article on DSDT.

ACPI fix for notebooks

Sometimes you see "ACPI: EC: input buffer is not empty, aborting transaction". This is a problem with acpi, more specifically an incompatibility of the BIOS. There are four ways to solve this:

1. Update your BIOS.

2. "Easy" Put acpi=off in the kernel line in menu.lst (if you are using GRUB), but that will kill all acpi functionality like battery charging and power saving.

3. In some cases (such as here) the following has been reported to solve the issue. However, screen brightness may no longer be fully controllable.

$ xset dpms force off

4. "Hard" build your kernel with patch

5.seems fixed in 3.6 pf

If notebook doesn't start just remove AC adapter and remove battery for 5 sec and start without AC!


Installing Acpica from the AUR may fix suspend-related lockups on some machines.