no DPMS on HDMI output while screen lock

[Thomas Meyer <thomas m3y3r de>]

Hi,

I have an sound receiver attached to my HDMI output on my laptop, so I
can listen to music. but when I lock my screen in the gnome-shell with
Windows+L key combination, gnome-shell seems to enable DPMS on the HDMI
output: is there a way to exclude the HDMI output from being put into
power saving mode while the screen is locked by gnome-shell?

Any ideas how I can achieve this?

with kind regards
thomas