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I just got a 4K 27inch monitor and it worked great on windows 10 125% scaling, using hdmi. Then, I actually had to use the macbook for work, and it didn't get p

I just got a 4K 27inch monitor and it worked great on windows 10 125% scaling, using hdmi. Then, I actually had to use the macbook for work, and it didn't get past your step 1. There is no way to alter the sizes of things, its either 1080p on 27in or full 4k. But, I decided to try one more thing, and got the usb-c to displayport cable. Behold, it allowed me to have 1440p HiDPI scaling, which HDMI didn't. And, I thought it was an HDMI 2 cable. So, that's something to try, but probably just on Mac.

MisterTea 8y ago
I ran into a similar problem with an older 30" 1080 Viewsonic TV/monitor which featured both HDMI and DVI inputs. I wanted to hook my Intel Nuc to it which was running Linux mint 18-something. The Nuc has VGA and HDMI so I naturally hook it to the TV using an HDMI cable. For some reason, the desktop resolution of 1920x1080 was somehow being scaled larger than the screen cutting off the edges. No amount of playing with the TV scaling settings would get the damn picture to fit on the screen. I didn't know if it was Linux, the TV or the Nuc. So I spent the next two hours trying to figure it out to no avail. About to give up, I then had what I thought was a dumb idea, hook it to the TV using an HDMI-DVI cable. It worked. the 1920x1080 desktop filled the screen as it should. The only thing I can think of is the HDMI port is only setup to look for TV video profiles. The DVI port expects a PC so it can figure out the signal and get the picture right.
- u02sgb 8y ago
  That's common behaviour for a TV signal called "overscan". As you thought, it seems to be disabled if it knows a computer is connected. You can sometimes disable it in TV menus and most HTPC software has something to resize the UI to cope.