Dont sleep 1&
. Instead sleep 1;
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Ah sorry lemmy code sanitation is changing it. I added a note below it.
Have you tried putting the display to sleep from the CLI and see if there's any meaningful output?
I'm not at my desk but something like: https://askubuntu.com/questions/62858/turn-off-monitor-using-command-line
OK, I just realised you've already done something similar. Scratch what I wrote.