Параметры ядра Linux:Power management options

Power Management is most important for battery powered laptop computers; if you have a laptop, check out the Linux Laptop home page on the WWW at <http://www.linux-on-laptops.com/> or Tuxmobil - Linux on Mobile Computers at <http://www.tuxmobil.org/> and the Battery Powered Linux mini-HOWTO, available from <http://www.tldp.org/docs.html#howto>.

Note that, even if you say N here, Linux on the x86 architecture will issue the hlt instruction if nothing is to be done, thereby sending the processor to sleep and saving power.

If unsure, say N.

Поддержка pm_register() и друзей. Это устаревшее API, поэтому лучший вариант выбрать N.

To use this debugging feature you should attempt to suspend the machine, then reboot it, then run

dmesg -s 1000000 | grep 'hash matches'

CAUTION: this option will cause your machine's real-time clock to be set to an invalid time after a resume.

Linux ACPI provides a robust functional replacement for several legacy configuration and power management interfaces, including the Plug-and-Play BIOS specification (PnP BIOS), the MultiProcessor Specification (MPS), and the Advanced Power Management (APM) specification. If both ACPI and APM support are configured, whichever is loaded first shall be used.

The ACPI SourceForge project contains the latest source code, documentation, tools, mailing list subscription, and other information. This project is available at: <http://sourceforge.net/projects/acpi>

Linux support for ACPI is based on Intel Corporation's ACPI Component Architecture (ACPI CA). For more information see: <http://developer.intel.com/technology/iapc/acpi>

ACPI is an open industry specification co-developed by Compaq, Intel, Microsoft, Phoenix, and Toshiba. The specification is available at: <http://www.acpi.info>

(  /proc/acpi/debug_layer && debug_level are deprecated by
   /sys/module/acpi/parameters/debug_layer && debug_level.
   /proc/acpi/info is deprecated by
   /sys/module/acpi/parameters/acpica_version )

Note that this is an ref. implementation only. It may or may not work for your integrated video device.

Note: display switching code is currently considered EXPERIMENTAL,toying with these values may even lock your machine.

All settings are changed via /proc/acpi/asus directory entries. Owner and group for these entries can be set with asus_uid and asus_gid parameters.

More information and a userspace daemon for handling the extra buttons at <http://sourceforge.net/projects/acpi4asus/>.

If you have an ACPI-compatible ASUS laptop, say Y or M here. This driver is still under development, so if your laptop is unsupported or something works not quite as expected, please use the mailing list available on the above page (acpi4asus-user@lists.sourceforge.net)

If you have an IBM ThinkPad laptop, say Y or M here.

If you are not sure, say Y here.

On these machines, all system configuration is handled through the ACPI. This driver is required for access to controls not covered by the general ACPI drivers, such as LCD brightness, video output, etc.

This driver differs from the non-ACPI Toshiba laptop driver (located under "Processor type and features") in several aspects. Configuration is accessed by reading and writing text files in the /proc tree instead of by program interface to /dev. Furthermore, no power management functions are exposed, as those are handled by the general ACPI drivers.

More information about this driver is available at <http://memebeam.org/toys/ToshibaAcpiDriver>.

If you have a legacy free Toshiba laptop (such as the Libretto L1 series), say Y.

Enter 0 to disable this mechanism and allow ACPI to run by default no matter what the year. (default)

Ведите четыре цифры, соотвествующие году. Например, 2001 запрещает использование ACPI по умолчанию на машинах с датой DMI BIOS до 1 Января 2001 г. Для отмены этого механизма, при старте ядра можно передать параметр acpi=force.

Введите 0 для отключения этого механизма и разрешения использования ACPI в не зависимости от года (значение по умолчанию)

You should nearly always say Y here because many modern systems require this timer.

ACPI based physical hotplug of nodes, or non-NUMA machines that support physical cpu/memory hot-plug.

If one selects "m", this driver can be loaded with "modprobe acpi_container".

If you select "Y" here, you can disable actual use of the APM BIOS by passing the apm=off option to the kernel at boot time.

Note that the APM support is almost completely disabled for machines with more than one CPU.

It is in fact recommended to store GMT in your RTC, because then you don't have to worry about daylight savings time changes. The only reason not to use GMT in your RTC is if you also run a broken OS that doesn't understand GMT.

Note that this driver doesn't automatically change the CPU clock speed, you need to either enable a dynamic cpufreq governor (see below) after boot, or use a userspace tool.

For details, take a look at <file:Documentation/cpu-freq>.

If in doubt, say N.

cpufreq.debug=<value>

To get <value>, add

1 to activate CPUfreq core debugging,

2 to activate CPUfreq drivers debugging, and

4 to activate CPUfreq governor debugging

If in doubt, say Y.

If in doubt, say Y.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say Y.

For details, take a look at linux/Documentation/cpu-freq.

If in doubt, say N.

If you have a desktop machine then you should really be considering the 'ondemand' governor instead, however if you are using a laptop, PDA or even an AMD64 based computer (due to the unacceptable step-by-step latency issues between the minimum and maximum frequency transitions in the CPU) you will probably want to use this governor.

For details, take a look at linux/Documentation/cpu-freq.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

If in doubt, say Y.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

For details, take a look at <file:Documentation/cpu-freq/>.

If in doubt, say N.

If in doubt, say N.

If in doubt, say N.