1 files changed, 26 insertions, 0 deletions

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index ed296225dcd4..95f6657fff73 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -131,3 +131,29 @@ config SUSPEND_SMP
         bool
         depends on HOTPLUG_CPU && X86 && PM
         default y
+
+config APM_EMULATION
+        tristate "Advanced Power Management Emulation"
+        depends on PM && SYS_SUPPORTS_APM_EMULATION
+        help
+          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 <file: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).