Created
September 30, 2020 20:40
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RasPi - Turn HDMI on or off based on current state
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| # if the status contains "TV is off", turn it on | |
| # otherwise turn it off | |
| # /opt/vc/bin/tvservice -s | grep "TV is off" > /dev/null && /opt/vc/bin/tvservice -p || /opt/vc/bin/tvservice -o | |
| # tvservice leaves blank screen without refresh | |
| # https://www.raspberrypi.org/forums/viewtopic.php?t=249308 | |
| # workarounds: | |
| # a) use `fbset -depth 8 && fbset -depth 16` after turning on the display | |
| # b) use `vcgencmd display_power` | |
| # https://www.raspberrypi.org/documentation/raspbian/applications/vcgencmd.md | |
| vcgencmd display_power | grep 0 > /dev/null && vcgencmd display_power 1 || vcgencmd display_power 0 |
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