SCREENBLANK(1)

SCREENBLANK(1) | 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 framebuffer due to inactivity. The default is 600 seconds (10 minutes).
`-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

April 8, 2019 | NetBSD 9.5