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.Dd April 8, 2019 .Dt SCREENBLANK 1 .Os .Sh NAME .Nm screenblank .Nd screen saver daemon for wscons and FBIO machines .Sh SYNOPSIS .Nm screenblank .Op Fl k | Fl m .Op Fl d Ar inactivity-timeout .Op Fl e Ar wakeup-delay .Op Fl f Ar framebuffer .Op Fl i Ar input-device .Nm rq Fl b | Fl u .Sh DESCRIPTION .Nm 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.
p When killed with a SIGINT, SIGHUP, or SIGTERM, .Nm will re-enable the framebuffer. The pid can be found in the file
a /var/run/screenblank.pid .
p The options are as follows: l -tag -width indent t Fl b Overriding the other options, simply try (once) to blank the framebuffer, then exit. t Fl d Ar inactivity-timeout Wait the number of seconds specified by .Ar inactivity-timeout , expressed in the format .Dq xxx.xxx , before disabling the framebuffer due to inactivity. The default is 600 seconds (10 minutes). t Fl e Ar wakeup-delay Wait the number of seconds specified by .Ar wakeup-delay , expressed in the format .Dq xxx.xxx , before re-enabling the framebuffer once activity resumes. The default is .25 seconds. t Fl f Ar framebuffer Use the framebuffer device .Ar framebuffer instead of the default
a /dev/fb . t Fl i Ar input-device Add .Ar input-device to the list of devices to monitor for activity. t Fl k Do not check the keyboard for activity. t Fl m Do not check the mouse for activity. t Fl u Overriding the other options, simply try (once) to unblank the framebuffer, then exit. .El
p Note that the .Fl k and .Fl m flags are mutually exclusive. .Sh FILES l -tag -width "/var/run/screenblank.pid " t /dev/kbd The keyboard device. t /dev/mouse The mouse device. t /dev/console The console device. t /dev/fb The default framebuffer. t /dev/wskbd The keyboard for wscons machines. t /dev/wsmouse The mouse device for wscons machines. t /dev/ttyE0 The console device for wscons machines. t /var/run/screenblank.pid File containing the pid of .Nm . .El .Sh CAVEATS .Nm 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 .Cm noatime and/or .Cm nodevmtime options, it will not function as expected. A possible workaround is to use a script as such: d -literal -offset indent #!/bin/sh /usr/sbin/screenblank -d 0 -e 0 && read /usr/bin/pkill screenblank .Ed