How to make ACPI work

2006-05-22T21:47:33Z

Deek: Add information on ec_intr=0 for kernel 2.6.16+

==general==
===Kernel configuration===
First of all you'll have to enable ACPI support in your kernel (if your distro doesn't already have an ACPI enabled kernel).
To do this open your kernel config and enable ACPI Power Management:
:{{kernelconf|CONFIG_PM|<*>|Power Management support|Power management options|||}}
:{{kernelconf|CONFIG_ACPI_SLEEP|<*>|ACPI|Power management options|||}}

You'd most likely want to enable the following ACPI options:
:{{kernelconf|CONFIG_ACPI_SLEEP|<*>|Sleep States|ACPI|Power management options||}}
:{{kernelconf|CONFIG_ACPI_AC|<*>|AC Adapter|ACPI|Power management options||}}
:{{kernelconf|CONFIG_ACPI_BATTERY|<*>|Battery|ACPI|Power management options||}}
:{{kernelconf|CONFIG_ACPI_FAN|<*>|Fan|ACPI|Power management options||}}
:{{kernelconf|CONFIG_ACPI_PROCESSOR|<*>|Processor|ACPI|Power management options||}}
:{{kernelconf|CONFIG_ACPI_THERMAL|<*>|Thermal Zone|ACPI|Power management options||}}

If you prefer editing your {{path|.config}} file directly, you should set at least the following variables:
CONFIG_PM=y
CONFIG_ACPI_BOOT=y
CONFIG_ACPI_INTERPRETER=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_SLEEP_PROC_FS=y
CONFIG_ACPI_AC=y
CONFIG_ACPI_BATTERY=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_FAN=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_THERMAL=y
CONFIG_ACPI_BUS=y
CONFIG_ACPI_EC=y
CONFIG_ACPI_POWER=y
CONFIG_ACPI_PCI=y
CONFIG_ACPI_SYSTEM=y

Then recompile your kernel.

{{HINT| ACPI SLEEP States option did only show up for me after patching [[Software Suspend 2]] into the kernel .}}

===Kernel boot parameters===
Many ThinkPads have been hit by a recent (kernel 2.6.16) change to ACPI4Linux that changed the default means of accessing the ACPI Embedded Controller as a way to shake out underlying bugs in the EC access code. If your ThinkPad fails to resume properly (a blinking Sleep light on resume that doesn't go away, or a hang when trying to suspend/standby a second time), adding {{bootparm|ec_intr|0}} to your kernel command line may help.

===IBM specific ACPI driver===
Unfortunately, special drivers for ACPI on ThinkPads were not included with kernels prior 2.6.10. So you'll have to compile one yourself or get it as precompiled module for your kernel.

You have the choice between [[thinkpad-acpi]] and [[ibm-acpi]], with the latter being the recommended one.

If you use a post-2.6.10 kernel and you want to use [[ibm-acpi]], it is recommended to look on its projects page for a possibly newer version.

{{HINT|Generally it is a good idea to read the README included with the driver.}}

===ACPI daemon===
Also you'll need to install [[acpid]], if it isn't present on your system. [[acpid]] is a daemon that handles the ACPI events generated by the system. Read [[How to configure acpid]].

==Screen blanking (Standby)==
Make sure you have
Option "DPMS"
in the Monitor section of your {{path|/etc/X11/XF86Config}} or {{path|/etc/X11/xorg.conf}}.

Running {{cmduser|xset +dpms}} and then {{cmduser|xset dpms force off}} will turn off the backlight on a laptop screen.<br />

Note that this may not work in combination with {{cmduser|echo -n "mem" > /sys/power/state}} because switching to console causes the backlight to come back on before sleeping.

==Suspend to RAM (Sleep)==
ACPI Sleep/suspend-to-ram with recent 2.6.x kernels usually works fine. Have a look at the [[How to configure acpid|acpid configuration HOWTO]]. It includes a specific example for going to sleep on lid close.

For Troubleshooting, look at the [[Problems with ACPI suspend-to-ram|Problems with ACPI suspend-to-ram page]].

==Suspend to disk (Hibernate)==
There are two drivers for this available:
* [[swsusp]], which is in the kernel and
* [[Software Suspend 2]] which is more feature rich, but not yet in the kernel, so you have to patch it in yourself.

Both are reported to work fine as long as you use open-source graphic drivers. A comparison of the features can be found on [http://softwaresuspend.berlios.de/features.html this page].

Just in case you are in doubt...yes, it is safe in both cases to use the same swap partition as active swap and as suspend partition.

See the according drivers page for instructions.

==ThinkPads on which it is recommended to use ACPI==
*ThinkPad {{770X}}, {{770Z}}
*ThinkPad {{A20m}}, {{A20p}}, {{A20m}}, {{A20p}}, {{A21e}}, {{A21m}}, {{A21p}}, {{A22e}}, {{A22m}}, {{A22p}}, {{A30}}, {{A30p}}, {{A31}}, {{A31p}}
*ThinkPad {{G40}}, {{G41}}
*ThinkPad {{R30}}, {{R31}}, {{R32}}, {{R40}}, {{R40e}}, {{R50}}, {{R50e}}, {{R50p}}, {{R51}}, {{R52}}
*ThinkPad {{T20}}, {{T21}}, {{T22}}, {{T23}}, {{T30}}, {{T40}}, {{T40p}}, {{T41}}, {{T41p}}, {{T42}}, {{T42p}}, {{T43}}, {{T43p}}
*ThinkPad {{X20}}, {{X21}}, {{X22}}, {{X23}}, {{X24}}, {{X30}}, {{X31}}, {{X32}}, {{X40}}, {{X41}}, {{X41T}}
*ThinkPad {{TransNote}}

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How to make ACPI work