ACPI modules

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From uefi.org:

The Advanced Configuration and Power Interface (ACPI) specification was developed to establish industry common interfaces enabling robust operating system (OS) directed motherboard device configuration and power management of both devices and entire systems. ACPI is the key element in OS-directed configuration and Power Management (OSPM).

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)
  • asus-laptop (useful on ASUS/medion laptops)
  • battery (battery status)
  • bay (bay status)
  • button (catch button events, like LID or POWER BUTTON)
  • container (container status)
  • dock (docking station status)
  • fan (fan status)
  • i2c_ec (EC SMBus driver)
  • thinkpad_acpi (useful on Lenovo ThinkPad laptops)
  • processor (processor status)
  • sbs (smart battery status)
  • thermal (status of thermal sensors)
  • toshiba_acpi (useful for Toshiba laptops)
  • video (status of video devices)

A complete list for your running kernel can be obtained with the following command: 

$ 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 using modprobe yourmodule, then check if the module is supported on your hardware by using dmesg. It may help to add a grep text search to narrow your results: 

# dmesg | grep -i 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 configuration files in /etc/modules-load.d. /etc/modules-load.d is described in Kernel modules#Automatic module loading with systemd.

Getting information

To read out battery information, you can simply install the package acpi and run acpi -i.

Using /proc to store ACPI information has been discouraged and deprecated since Linux 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. For example, for battery: 

/sys/class/power_supply/BAT0/

Troubleshooting

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 may be four ways to solve this issue:

  • If available, flash BIOS.
  • Use acpi=off as kernel parameter, however this will kill all ACPI functionality like battery charging and power saving.
  • In some cases disabling DPMS has been reported to solve the issue [1]. However, screen brightness may no longer be fully controllable: 
    $ xset dpms force off
  • Build a custom kernel with patches of bugs.launchpad.net.

See also