dpmssettimeouts(3) [centos man page]
DPMSSetTimeouts(3) X FUNCTIONS DPMSSetTimeouts(3) NAME
DPMSSetTimeouts - permits applications to set the timeout values used by the X server for DPMS timings SYNOPSIS
cc [ flag ... ] file ... -lXext [ library ... ] #include <X11/extensions/dpms.h> Status DPMSSetTimeouts ( Display *display, CARD16 standby, CARD16 suspend, CARD16 off ); ARGUMENTS
display Specifies the connection to the X server standby Specifies the new standby timeout in seconds suspend Specifies the new suspend timeout in seconds off Specifies the new off timeout in seconds DESCRIPTION
The DPMSSetTimeouts function permits applications to set the timeout values used by the X server for Display Power Management Signaling (DPMS) timings. The value standby is the amount of inactivity time, in seconds, before standby mode is invoked. The actual effects of this mode are depen- dent on the characteristics of the monitor and frame buffer card. Standby mode is implemented by shutting off the horizontal sync signal, and pulsing the vertical sync signal. Standby mode provides the quickest monitor recovery time. Note also that many monitors implement this mode identical to suspend mode. A value of zero disables the standby mode. The value suspend is the amount of time of inactivity, in seconds, before the second level of power savings is invoked. Suspend mode's physical and electrical characteristics are implementation defined. For DPMS compliant hardware, setting the suspend mode is implemented by pulsing the horizontal sync signal and shutting off the vertical sync signal. In general, suspend mode recovery is considered to be slower than standby mode, but faster than off mode. However it may vary from monitor to monitor. As noted above, many monitors implement this mode identical to the standby mode. A value of zero disables this mode. The value off is the amount of time of inactivity,in seconds, before the third and final level of power savings is invoked. Off mode's physical and electrical characteristics are implementation defined. In DPMS compliant hardware, it is implemented by shutting off both hor- izontal and vertical sync signals, resulting in powering down of the monitor. Recovery time is implementation dependent. Usually the recovery time is very close to the power-up time of the monitor. A value of zero disables this mode. Chronologically, standby mode occurs before or simultaneously with suspend mode, and suspend mode must occur before or simultaneously with off mode. Therefore, non-zero mode timeout values must be greater than or equal to the timeout values of earlier modes. If inconsistent values are supplied, a BadValue error will result. RETURN VALUES
TRUE The DPMSSetTimeouts function returns TRUE when the function has succeeded. ERRORS
BadValue An argument is out of range. SEE ALSO
DPMSCapable(3), DPMSInfo(3), DPMSGetTimeouts(3) X Version 11 libXext 1.3.2 DPMSSetTimeouts(3)
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APMSLEEP(1) APMSLEEP(1) NAME
apmsleep - go into suspend or standby mode and wake-up later SYNOPSIS
apmsleep [-sSnwhVd] [--suspend] [--standby] [--noapm] [--wait] [--precise] [--help] [--version] [--debug] [+]hh:mm DESCRIPTION
Some computers, especially laptops, can wake-up from a low-power suspend 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. REQUIRED SYSTEM CONFIGURATION
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 config- ure 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. Privileges The program must be run as root or have the SUID attribute set (see chmod(1)). BUGS
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 kernel). This program was tested on a Winbook XL laptop (Pentium) only. It may not function on your hardware. AUTHOR
Written by Peter Englmaier (ppe@mpe.mpg.de) and may be freely distributed under the terms of the GNU General Public License. The code is based on Paul Gortmacher's RTC test/example program. There is ABSOLUTELY NO WARRANTY for this program. The current maintainer is Peter Englmaier. SEE ALSO
xapm(1), apmd(8). January 2004 APMSLEEP(1)