screenblank(1) - NetBSD Manual Pages

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SCREENBLANK(1)          NetBSD General Commands Manual          SCREENBLANK(1)


NAME

     screenblank -- screen saver daemon for wscons and FBIO machines


SYNOPSIS

     screenblank [-k | -m] [-d inactivity-timeout] [-e wakeup-delay]
                 [-f framebuffer] [-i input-device]
     screenblank {-b | -u}


DESCRIPTION

     screenblank disables the framebuffer if the keyboard and mouse are idle
     for a period of time, and re-enables the framebuffer when keyboard or
     mouse activity resumes.

     When killed with a SIGINT, SIGHUP, or SIGTERM, screenblank will re-enable
     the framebuffer.  The pid can be found in the file
     /var/run/screenblank.pid.

     The options are as follows:

     -b      Overriding the other options, simply try (once) to blank the
             framebuffer, then exit.

     -d inactivity-timeout
             Wait the number of seconds specified by inactivity-timeout,
             expressed in the format ``xxx.xxx'', before disabling the frame-
             buffer due to inactivity.  The default is 600 seconds (10 min-
             utes).

     -e wakeup-delay
             Wait the number of seconds specified by wakeup-delay, expressed
             in the format ``xxx.xxx'', before re-enabling the framebuffer
             once activity resumes.  The default is .25 seconds.

     -f framebuffer
             Use the framebuffer device framebuffer instead of the default
             /dev/fb.

     -i input-device
             Add input-device to the list of devices to monitor for activity.

     -k      Do not check the keyboard for activity.

     -m      Do not check the mouse for activity.

     -u      Overriding the other options, simply try (once) to unblank the
             framebuffer, then exit.

     Note that the -k and -m flags are mutually exclusive.


FILES

     /dev/kbd                    The keyboard device.

     /dev/mouse                  The mouse device.

     /dev/console                The console device.

     /dev/fb                     The default framebuffer.

     /dev/wskbd                  The keyboard for wscons machines.

     /dev/wsmouse                The mouse device for wscons machines.

     /dev/ttyE0                  The console device for wscons machines.

     /var/run/screenblank.pid    File containing the pid of screenblank.


CAVEATS

     screenblank checks the access and modification times of the devices it is
     monitoring to determine activity.  If the devices are on a file system
     mounted with the noatime and/or nodevmtime options, it will not function
     as expected.  A possible workaround is to use a script as such:

           #!/bin/sh
           /usr/sbin/screenblank -d 0 -e 0 && read
           /usr/bin/pkill screenblank

NetBSD 10.1                      April 8, 2019                     NetBSD 10.1