[coldtea]

>* Tell me how you disable your second monitor in OSX using the gui. It was impossible to do this around 2 years ago when I tried, it probably still is.*

By going to the Preferences -> Display?

>It is also super fun trying to get a macbook to output both sound and video onto a tv

Never had any issue with it, with 2 TV models, a projector, 2 Macs (Air, MBPr) -- using HDMI in all.

[spronkey]

Apple thinks my Dell U2410s are TVs when connected over HDMI, and uses YPbPr colour space, and some weird stuff because of it. There's no way to tell the OS that it's a monitor without using an EDID override, which is now extremely difficult to do because of the system file protection in 10.11. Pain. In. The. Behind.

Don't even get me started on the couple of years when you couldn't even really use a second monitor after Lion. Dear god.

[matwood]

Use display port instead? OSX is not great with multi-monitor, but it has come a long way. I have 2 monitors hooked up to my 2014 mbp using display port and they work fine.

[spronkey]

Yeah, I would - but I need dual external monitors and thunderbolt at the same time - forced to use the HDMI for one or buy a daisy chaining display. Sigh.