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CONFIG_APM: APM (Advanced Power Management) BIOS support

General informations

The Linux kernel configuration item CONFIG_APM has multiple definitions:

APM (Advanced Power Management) BIOS support found in arch/i386/Kconfig

The configuration item CONFIG_APM:

Help text

APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change).

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.

In order to use APM, you will need supporting software. For location and more information, read Documentation/pm.txt and the Battery Powered Linux mini-HOWTO, available from http://www.tldp.org/docs.html#howto.

This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors.

This driver does not support the TI 4000M TravelMate and the ACER 486/DX4/75 because they don't have compliant BIOSes. Many "green" desktop machines also don't have compliant BIOSes, and this driver may cause those machines to panic during the boot phase.

Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS).

Some other things you should try when experiencing seemingly random, "weird" problems:

1) make sure that you have enough swap space and that it is enabled. 2) pass the "no-hlt" option to the kernel 3) switch on floating point emulation in the kernel and pass the "no387" option to the kernel 4) pass the "floppy=nodma" option to the kernel 5) pass the "mem=4M" option to the kernel (thereby disabling all but the first 4 MB of RAM) 6) make sure that the CPU is not over clocked. 7) read the sig11 FAQ at http://www.bitwizard.nl/sig11/ 8) disable the cache from your BIOS settings 9) install a fan for the video card or exchange video RAM 10) install a better fan for the CPU 11) exchange RAM chips 12) exchange the motherboard.

To compile this driver as a module, choose M here: the module will be called apm.

APM (Advanced Power Management) BIOS support found in arch/x86/Kconfig

The configuration item CONFIG_APM:

Help text

APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change).

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.

In order to use APM, you will need supporting software. For location and more information, read Documentation/power/apm-acpi.txt and the Battery Powered Linux mini-HOWTO, available from http://www.tldp.org/docs.html#howto.

This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors.

This driver does not support the TI 4000M TravelMate and the ACER 486/DX4/75 because they don't have compliant BIOSes. Many "green" desktop machines also don't have compliant BIOSes, and this driver may cause those machines to panic during the boot phase.

Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS).

Some other things you should try when experiencing seemingly random, "weird" problems:

1) make sure that you have enough swap space and that it is enabled. 2) pass the "no-hlt" option to the kernel 3) switch on floating point emulation in the kernel and pass the "no387" option to the kernel 4) pass the "floppy=nodma" option to the kernel 5) pass the "mem=4M" option to the kernel (thereby disabling all but the first 4 MB of RAM) 6) make sure that the CPU is not over clocked. 7) read the sig11 FAQ at http://www.bitwizard.nl/sig11/ 8) disable the cache from your BIOS settings 9) install a fan for the video card or exchange video RAM 10) install a better fan for the CPU 11) exchange RAM chips 12) exchange the motherboard.

To compile this driver as a module, choose M here: the module will be called apm.

Advanced Power Management Emulation found in arch/arm/Kconfig

The configuration item CONFIG_APM:

Help text

APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change).

In order to use APM, you will need supporting software. For location and more information, read Documentation/pm.txt and the Battery Powered Linux mini-HOWTO, available from http://www.tldp.org/docs.html#howto.

This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors.

Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS).

Advanced Power Management Emulation found in arch/mips/Kconfig

The configuration item CONFIG_APM:

Help text

APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered systems with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change).

In order to use APM, you will need supporting software. For location and more information, read Documentation/pm.txt and the Battery Powered Linux mini-HOWTO, available from http://www.tldp.org/docs.html#howto.

This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors.

Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS).

Advanced Power Management Emulation found in arch/sh/Kconfig

The configuration item CONFIG_APM:

Help text

(none)

Hardware

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