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    The following form allows you to view linux man pages.

    Command:

    rtcwake

    
    
    

    SYNOPSIS

           rtcwake [-hvVlua] [-d device] [-m standby_mode] {-t time_t|-s seconds}
    
    
    

    DESCRIPTION

           This  program  is  used  to  enter a system sleep state until specified
           wakeup time.
    
           This uses cross-platform Linux  interfaces  to  enter  a  system  sleep
           state,  and  leave  it no later than a specified time.  It uses any RTC
           framework driver that supports standard driver model wakeup flags.
    
           This is normally used like the old apmsleep utility,  to  wake  from  a
           suspend  state  like  ACPI  S1  (standby) or S3 (suspend-to-RAM).  Most
           platforms can implement those without analogues of BIOS, APM, or  ACPI.
    
           On  some  systems, this can also be used like nvram-wakeup, waking from
           states like ACPI S4 (suspend to disk).  Not all systems have persistent
           media that are appropriate for such suspend modes.
    
       Options
           -v | --verbose
                  Be verbose.
    
           -h | --help
                  Display  a short help message that shows how to use the program.
    
           -V | --version
                  Displays version information and exists.
    
           -a | --auto
                  Reads the clock mode (whether the hardware clock is set  to  UTC
                  or  local time) from /etc/adjtime. That's the location where the
                  hwclock(8) stores that information.
    
           -l | --local
                  Assumes that the hardware clock is set to local time, regardless
                  of the contents of /etc/adjtime.
    
           -u | --utc
                  Assumes  that  the  hardware clock is set to UTC (Universal Time
                  Coordinated), regardless of the contents of /etc/adjtime.
    
           -d device | --device device
                  Uses device instead of rtc0 as realtime clock.  This  option  is
                  only  relevant  if  your  system  has more than one RTC. You may
                  specify rtc1, rtc2, ... here.
    
           -s seconds | --seconds seconds
                  Sets the wakeup time to seconds in future from now.
    
           -t time_t | --time time_t
                  Sets the wakeup time to the absolute time time_t. time_t is  the
                         into  a  low-power  state,  except  for  memory, which is
                         placed in self-refresh mode to retain its contents.
    
                  disk   ACPI state S4 (Suspend-to-disk). This  state  offers  the
                         greatest  power  savings,  and  can  be  used even in the
                         absence of low-level platform support for  power  manage-
                         ment.  This  state  operates similarly to Suspend-to-RAM,
                         but includes a final step of writing memory  contents  to
                         disk.
    
                  off    ACPI  state  S5  (Poweroff).  This  is  done  by  calling
                         '/sbin/shutdown'.  Not officially supported by ACPI,  but
                         usually working.
    
                  no     Don't  suspend.  The rtcwake command sets RTC wakeup time
                         only.
    
                  on     Don't suspend, but  read  RTC  device  until  alarm  time
                         appears. This mode is useful for debugging.
    
    
    

    NOTES

           Some  PC  systems  can't  currently exit sleep states such as mem using
           only the kernel code accessed by this  driver.   They  need  help  from
           userspace code to make the framebuffer work again.
    
    
    

    HISTORY

           The  program  was  posted  several times on LKML and other lists before
           appearing in kernel commit message for Linux  2.6  in  the  GIT  commit
           87ac84f42a7a580d0dd72ae31d6a5eb4bfe04c6d.
    
    
    

    AVAILABILITY

           The  rtcwake command is part of the util-linux-ng package and is avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    AUTHOR

           The program was  written  by  David  Brownell  <dbrownell@users.source-
           forge.net> and improved by Bernhard Walle <bwalle@suse.de>.
    
    
    

    COPYRIGHT

           This  is  free software.  You may redistribute copies of it  under  the
           terms     of      the       GNU      General       Public       License
           <http://www.gnu.org/licenses/gpl.html>.   There  is NO WARRANTY, to the
           extent permitted by law.
    
    
    

    SEE ALSO

           hwclock(8), date(1)
    
                                      2007-07-13                        rtcwake(8)
    
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