opendisplay - https://github.com/peetzweg/opendisplay - can make a old iMac's screen useful again. In my case, a 2015 27" iMac can be used as a monitor for my modern Mac laptop, connected via ethernet cable.
replyVery cool, I like this a lot. Will be giving it a try!
replyI've had good success with https://juicycrumb.com/product/docklite/#imac-model
replyThere is a g4 model too there if thats the version you have.
They are never as good as native input. There are a lot of compression going on that reduce image quality and increase latency.
replyAlso they require software on both sides, so if you want to use your imac to display your computer BIOS, no.
I wonder if Apple dropped it because of some proprietary licensed IP, such as Intel WiDi, making the feature possible.
replyNo, it was when the displays went to Retina. There was no way to drive them at 5K externally. Thunderbolt didn't have the bandwidth to do so.
replyThey dropped it before the switch from Intel chips; my 2015 iMac could do it (I think) but my 2019 Intel iMac can't.
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