apmsleep man page on aLinux

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APMSLEEP(1)							   APMSLEEP(1)

       apmsleep - go into suspend or standby mode and wake-up later

       apmsleep	 [-sSnwhVd] [--suspend] [--standby] [--noapm] [--wait] [--pre‐
       cise] [--help]  [--version] [--debug] [+]hh:mm

       Some computers, especially laptops, can wake-up from a  low-power  sus‐
       pend  to	 DRAM mode using the Real-time-clock (RTC) chip.  Apmsleep can
       be used to set the alarm time in the RTC and  to	 go  into  suspend  or
       standby mode. An interrupt from the RTC causes the computer to wake-up.
       The program detects this event, by waiting for a	 leap  in  the	kernel
       time  and  terminates  successfully.  If no time leap occurs within one
       minute, or something goes wrong, the exit value will be non-zero.

       The wake-up time can be specified in two formats:

       +hh:mm specifies a relative offset to the current  time.	 The  computer
       will  suspend for exactly hh hours and mm minutes plus a few seconds to
       wake up.	 On some laptops, the timing is not completely accurate so  it
       may be a few minutes (or more?) late.

       hh:mm  specifies absolute local time in 24-hour format. The time stored
       in the RTC is not important.  You may change the time zone  used,  with
       the  TZ	environment  variable  as  usual.  Daylight saving time is not
       obeyed in this version, but might be in a future release.  WARNING:  Do
       not  close  cover  of laptop after suspending the laptop with apmsleep.
       Most laptops overheat when running with closed cover.

       Energy conservation with APM is little for a desktop.  Turning  of  the
       screen  will  save  1/2, going into standby with drives turned off will
       save another 1/6th of the current.

       -V, --version
	      Print the apmsleep program version and exit immediately.

       -s, --suspend
	      Put the machine into suspend mode if possible (default).	On  my
	      laptop, suspend mode turns off everything except the memory.

       -S, --standby
	      Put  the	machine	 into  standby mode if possible. On my laptop,
	      standby mode turns off screen, hard disk, and CPU.

       -w, --wait
	      Wait indefinitely for the time leap.

       -p, --precise
	      Wait for alarm time to match actual time. Do not wait  for  time
	      leap.  This might be useful even without APM.

       -n, --noapm
	      Do  not  call  apm  bios to suspend computer, just set the alarm
	      clock and wait for time leap indefinitely.

       -d, --debug
	      Print some information about what is going on.

       Kernel The special character device /dev/rtc must exist and the	kernel
	      needs to be compiled with APM and RTC support.

       BIOS   The  computer  must have the 'suspend to RAM' feature enabled in
	      the BIOS; 'suspend to Disk' will not work, because the  computer
	      is  turned  off  completely. You do not need to enable the ALARM
	      timer, it will be activated by apmsleep. On some boards, you can
	      configure	 which	interrupts  can	 be used to awake from suspend
	      mode. If you have such a board, you might want to make sure that
	      keyboard	(IRQ 1) and RTC (IRQ 8) are among those interrupts. If
	      your computer does not wake up, try to enable  'modem  ring'  in
	      the BIOS, even if you do not have a modem.

	      The  program  must be run as root or have the SUID attribute set
	      (see chmod(1)).

       Apmsleep cannot detect which event terminated the suspension.  Possible
       events are: keyboard or mouse activity, modem ring, alarm from RTC, any
       other interrupt. Sometimes, the time  leap  is  not  detected  properly
       (causing a wrong exit value).

       Should use APM BIOS calls to set alarm clock (not yet supported by ker‐

       This program was tested on a Winbook XL laptop (Pentium) only.  It  may
       not function on your hardware.

       Written	by Peter Englmaier (ppe@mpe.mpg.de) and may be freely distrib‐
       uted under the terms of the GNU General Public License.	 The  code  is
       based  on  Paul	Gortmacher's RTC test/example program.	There is ABSO‐
       LUTELY NO WARRANTY for this program.  The current maintainer  is	 Peter

       xapm(1), apmd(8).

				 January 2004			   APMSLEEP(1)

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