Hi,
I've tried this as well now.
I have two Cine S2 dual-tuner cards (an older 5.5 running on ngene driver and a 6.5 running with the ddbridge driver) attached to a cascadable multiswitch.
The VDR (2.2) runs as a headless server with the vnsi plugin to allow to connect Kodi clients to the VDR.
With all adapters active, I see a power consumption of about 50W. When your power-saving patch kicks in, this is reduced by about 7W to 43W.
So far this seems to work fine. Thanks for this patch!
+1 for including this into vanilla VDR.
bye,
Tobias