I did some more testing and used a USB sound card. If I select output to that one its still selected when I turn off the monitor.
So it's only when I use the built in sound that it switched to HDMI when I turn off the monitor.
I did some more testing and used a USB sound card. If I select output to that one its still selected when I turn off the monitor.
So it's only when I use the built in sound that it switched to HDMI when I turn off the monitor.