Unblanking powered-down HDMI displays
by RandomTroll from LinuxQuestions.org on (#6EKTV)
I have an HDMI display for the first time. I have setterm power displays down after 60 minutes. It's supposed to come back on when I use the keyboard or mouse. It doesn't. When I have it connected to my laptop, which also uses its local display, it does. Powering it down then up doesn't make it work. If it matters, the computer has a DisplayPort output, I use a DP-HDMI adaptor.