Also based in Denmark like @mdhenriksen and considering going the foil route for a frameless 32" bathroom mirror. What about interglas.dk? Have you tried them? I’m contacting them tomorrow to see what the price is - as the in-site calculator they have says for 70x40cm the mirror is 50€ + shipping :astonished_face:
SOLVED
This is not really a solution, but my error was that I was logged in on “Ubuntu on Wayland” which doesn’t have DPMS.
On the login screen of Ubuntu you can click the little gear-icon and choose what kind of Ubuntu you want to login to. Wayland is a bit restricted, so just go with “Ubuntu” and not “Ubuntu on Wayland”