Ubuntu: Sleep display on iMac


I've installed Ubuntu Server 16.04 as the boot OS on an old iMac Core 2 Duo. It works very well. Only problem is, the built in display won't shut down. After a few minutes of inactivity it goes completely white. Tried fiddling with different dpms commands and it doesn't help. I'm not a Linux expert, I'm just using this as a home WebDAV server and Plex music streaming device, and most of the time I don't need to look at it, much less have it light up the room it's in. Apple brightness keys don't have any effect of course. Any ideas?

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