Martin Bauer
7ccc4dda26
X wakes the monitor on any key press, so by the time the Del key reaches the backend the monitor is already on and a toggle going by the monitor would switch it straight back off. Only `off` ever enables DPMS, so toggle goes by that instead. on/off now print the state they set, which the backend uses for its blubb's direction. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
58 lines
1.9 KiB
Django/Jinja
58 lines
1.9 KiB
Django/Jinja
#!/bin/sh
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# Managed by ansible (pi_kiosk role).
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#
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# kiosk-screen on|off|toggle|status - switch the kiosk's monitor on or off.
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#
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# "Off" is DPMS: X stops the HDMI signal and the monitor drops into standby. The
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# session, the browser and everything playing carry on. The MusicMouse backend runs
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# `kiosk-screen toggle` for the IR remote's power key (its config's screen: section);
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# it works over ssh as root too.
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#
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# .xinitrc turns DPMS off so the screen never blanks by itself. Forcing it off has to
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# turn DPMS on, so `on` turns it back off again - otherwise the screen would blank on
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# its own ten minutes after every switch-on.
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#
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# `toggle` therefore goes by whether DPMS is enabled, not by whether the monitor is lit:
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# only `off` ever enables it. That matters for the keyboard. X wakes the monitor on any
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# key press, so by the time the browser hands the Del key to the backend the monitor is
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# already on again - going by that, toggle would switch it straight back off. Going by
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# DPMS, the press reads as "switch on", which is what it was. (Woken by any other key,
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# the screen stays on until the next toggle, which then makes the "on" stick.)
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set -e
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export DISPLAY=:0
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export XAUTHORITY=/home/{{ pi_kiosk_user }}/.Xauthority
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# With DPMS disabled `xset q` prints no monitor line at all, and the monitor is on.
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status() {
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if xset q | grep -q "Monitor is Off"; then echo off; else echo on; fi
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}
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switched_off() {
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xset q | grep -q "DPMS is Enabled"
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}
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# Each prints the state it set: the backend picks the blubb's direction from that word.
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screen_on() {
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xset dpms force on
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xset -dpms
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echo on
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}
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screen_off() {
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xset +dpms
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xset dpms force off
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echo off
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}
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case "$1" in
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on) screen_on ;;
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off) screen_off ;;
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toggle) if switched_off; then screen_on; else screen_off; fi ;;
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status) status ;;
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*)
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echo "usage: $0 on|off|toggle|status" >&2
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exit 2
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;;
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esac
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