This doesn't work for me. Message
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warning: output HDMI-1 not found; ignoring
I've switched to old driver and executed
Then energy consumption goes down from 0.11A to 0.07A, so saving about 40 mA. That is about 1/3 power saving.
This command works when you go to raspi-config --> Advanced options --> GL driver. Then it dowloads about 30.5 MB and installs about 131 MB, but then Legacy driver can be selected used and power can be saved.
I didn't try
because then video would be always off (if working at all). But the advantage of tvservice --off is that you can execute it about 5 minutes after boot. So if there is a problem some time you can easily connect display cable, disable tvservice --off and do debugging why something isn't working.
Would be great if there would be an equal option for the new drivers.