I have setup Ubuntu 22.04 recently on an old Late-2012 iMac, which I have setup to be a simple media server.
Everything is working well, but I can't seem to get the display to turn completely off. When the display powers off after inactivity, I can still see some backlighting, and it doesn't appear to be actually off.
I have followed the instructions here as well:
unable to power off macbook display w/ ubuntu server
and here:
If I run the command setterm —blank force, the screen does go black, but I can always still see some backlighting.
Any thoughts on how to get the iMac screen to complete turn off?
