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Wake up monitor from standby and show the screen without blocking further standby [Ubuntu 16.04]
November 28, 2016
Edited: June 12, 2020
November 24, 2022
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The only thing I could find on your situation was this webpage (Can’t wake up monitor once dpms put it into sleep) from Archlinux. It’s a long read but at the very bottom one poster recommends your script say this:
sleep 1 && xset dpms force standby && sleep 8 && xset dpms force on
Note this user tip implies it is based on having turned off DRI3 in
/etc/X11/xorg.conf.d/20-intel.conf and using DRI2:
Section "Device" Identifier "Intel Graphics" Driver "intel" Option "DRI" "2" EndSection
Please note this is the best I could come up with for your problem and felt compelled to post it because there have been no other answers. Since I can’t reproduce your problem I have no idea if it will work for you as it has for others.
If it doesn’t work I encourage you to google as much as you can using appropriate keywords.