[Milhouse]

I've seen it discussed before. IIRC, the PI can't reliably cut power to just HDMI on-the-fly without going into a kind of suspend mode that requires a reboot to get out of.

There certainly seems to be some truth to this, as you can turn off the HDMI with

Code:

tvservice -o

but turning HDMI back on with:

Code:

tvservice -p

doesn't work. Although the monitor comes out of power save mode, and tvservice thinks the status of HDMI has now been restored, the on screen image remains black (the monitor backlight is on, it's just that nothing is visible).

So is this just a firmware issue? It would be really nice if power save could be implemented successfully.