Adding upstream version 2.36.1.upstream/2.36.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 189 insertions, 0 deletions

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+.\" Copyright (c) 2007, SUSE LINUX Products GmbH
+.\"                     Bernhard Walle <bwalle@suse.de>
+.\"
+.\" This program is free software; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License
+.\" as published by the Free Software Foundation; either version 2
+.\" of the License, or (at your option) any later version.
+.\"
+.\" This program is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+.\" GNU General Public License for more details.
+.\"
+.\" You should have received a copy of the GNU General Public License
+.\" along with this program; if not, write to the Free Software
+.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+.\" 02110-1301, USA.
+.\"
+.TH RTCWAKE 8 "June 2015" "util-linux" "System Administration"
+.SH NAME
+rtcwake \- enter a system sleep state until specified wakeup time
+.SH SYNOPSIS
+.B rtcwake
+[options]
+.RB [ \-d
+.IR device ]
+.RB [ \-m
+.IR standby_mode ]
+.RB { "\-s \fIseconds\fP" | "\-t \fItime_t\fP" }
+.SH DESCRIPTION
+This program is used to enter a system sleep state and to automatically
+wake from it at a specified time.
+.PP
+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.
+.PP
+This is normally used like the old \fBapmsleep\fP 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.
+.PP
+On some systems, this can also be used like \fBnvram-wakeup\fP, waking from states
+like ACPI S4 (suspend to disk).  Not all systems have persistent media that are
+appropriate for such suspend modes.
+.PP
+Note that alarm functionality depends on hardware; not every RTC is able to setup
+an alarm up to 24 hours in the future.
+.PP
+The suspend setup may be interrupted by active hardware; for example wireless USB
+input devices that continue to send events for some fraction of a second after the
+return key is pressed.
+.B rtcwake
+tries to avoid this problem and it waits to terminal to settle down before
+entering a system sleep.
+
+.SH OPTIONS
+.TP
+.BR \-A , " \-\-adjfile " \fIfile
+Specify an alternative path to the adjust file.
+.TP
+.BR \-a , " \-\-auto"
+Read the clock mode (whether the hardware clock is set to UTC or local time)
+from the \fIadjtime\fP file, where
+.BR hwclock (8)
+stores that information.  This is the default.
+.TP
+.BR \-\-date " \fItimestamp"
+Set the wakeup time to the value of the timestamp.  Format of the
+timestamp can be any of the following:
+.TS
+tab(|);
+l2 l.
+YYYYMMDDhhmmss
+YYYY-MM-DD hh:mm:ss
+YYYY-MM-DD hh:mm|(seconds will be set to 00)
+YYYY-MM-DD|(time will be set to 00:00:00)
+hh:mm:ss|(date will be set to today)
+hh:mm|(date will be set to today, seconds to 00)
+tomorrow|(time is set to 00:00:00)
++5min
+.TE
+.TP
+.BR \-d , " \-\-device " \fIdevice
+Use the specified \fIdevice\fP instead of \fBrtc0\fP as realtime clock.
+This option is only relevant if your system has more than one RTC.
+You may specify \fBrtc1\fP, \fBrtc2\fP, ... here.
+.TP
+.BR \-l , " \-\-local"
+Assume that the hardware clock is set to local time, regardless of the
+contents of the \fIadjtime\fP file.
+.TP
+.B \-\-list\-modes
+List available \-\-mode option arguments.
+.TP
+.BR \-m , " \-\-mode " \fImode
+Go into the given standby state.  Valid values for \fImode\fP are:
+.RS
+.TP
+.B standby
+ACPI state S1.  This state offers minimal, though real, power savings, while
+providing a very low-latency transition back to a working system.  This is the
+default mode.
+.TP
+.B freeze
+The processes are frozen, all the devices are suspended and all the processors
+idled.  This state is a general state that does not need any platform-specific
+support, but it saves less power than Suspend-to-RAM, because the system is
+still in a running state.  (Available since Linux 3.9.)
+.TP
+.B mem
+ACPI state S3 (Suspend-to-RAM).  This state offers significant power savings as
+everything in the system is put into a low-power state, except for memory,
+which is placed in self-refresh mode to retain its contents.
+.TP
+.B 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
+management.  This state operates similarly to Suspend-to-RAM, but includes a
+final step of writing memory contents to disk.
+.TP
+.B off
+ACPI state S5 (Poweroff).  This is done by calling '/sbin/shutdown'.
+Not officially supported by ACPI, but it usually works.
+.TP
+.B no
+Don't suspend, only set the RTC wakeup time.
+.TP
+.B on
+Don't suspend, but read the RTC device until an alarm time appears.
+This mode is useful for debugging.
+.TP
+.B disable
+Disable a previously set alarm.
+.TP
+.B show
+Print alarm information in format: "alarm: off|on  <time>".
+The time is in ctime() output format, e.g., "alarm: on  Tue Nov 16 04:48:45 2010".
+.RE
+.TP
+.BR \-n , " \-\-dry-run"
+This option does everything apart from actually setting up the alarm,
+suspending the system, or waiting for the alarm.
+.TP
+.BR \-s , " \-\-seconds " \fIseconds
+Set the wakeup time to \fIseconds\fP in the future from now.
+.TP
+.BR \-t , " \-\-time " \fItime_t
+Set the wakeup time to the absolute time \fItime_t\fP.  \fItime_t\fP
+is the time in seconds since 1970-01-01, 00:00 UTC.  Use the
+.BR date (1)
+tool to convert between human-readable time and \fItime_t\fP.
+.TP
+.BR \-u , " \-\-utc"
+Assume that the hardware clock is set to UTC (Universal Time Coordinated),
+regardless of the contents of the \fIadjtime\fP file.
+.TP
+.BR \-v , " \-\-verbose"
+Be verbose.
+.TP
+.BR \-V , " \-\-version"
+Display version information and exit.
+.TP
+.BR \-h , " \-\-help"
+Display help text and exit.
+.SH NOTES
+Some PC systems can't currently exit sleep states such as \fBmem\fP
+using only the kernel code accessed by this driver.
+They need help from userspace code to make the framebuffer work again.
+.SH FILES
+.I /etc/adjtime
+.SH 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.
+.SH AUTHORS
+The program was written by David Brownell <dbrownell@users.sourceforge.net>
+and improved by Bernhard Walle <bwalle@suse.de>.
+.SH 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.
+.SH "SEE ALSO"
+.BR hwclock (8),
+.BR date (1)
+.SH AVAILABILITY
+The rtcwake command is part of the util-linux package and is available from the
+.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
+Linux Kernel Archive
+.UE .