Question about LC49RG90SSRXEN - 168581

I do NOT believe the monitor will work with a MacBook Pro Late 2016 at this resolution. Firstly because my MacBook 2019 does not work with it (coming soon) and secondly because the "official" Apple specs (support.apple.com/en-us/HT206587) disprove this:

With macOS Sierra, MacBook (2015 and later) supports 4K (3840 x 2160) displays at 60Hz over DisplayPort.

I have a MacBook Pro 2019 13''

(strongest version) and can't get the resolution, although the specs as well as Apple support clearly say that it should theoretically work. Before Catalina I could not choose the resolution at all. Since Catalina I can select 5120x1440, but only 3840 x 2160 are sent natively, the rest is scaled up by the OS. The picture looks correspondingly bad. So just because it says 5120x1440, this doesn't have to be a native resolution ;)

Theoretically, the 2019 Macbook should support a resolution of up to 5120x1440 @ 60Hz, provided the display is connected via USB-C to DisplayPort. The 2019 MacBook Pro supports ONLY (!!!) DisplayPort native via USB-C. Only then is the resolution theoretically possible and only then with 60Hz. If an adapter (e.g. HDMI) is used, then the resolution cannot be achieved or only with 30Hz and less.

So much for the theory. I have the display as well as the latest MacBook Pro 2019 at home and it does NOT work. I have already called Apple support for several hours, with the conclusion that it should work THEORETICALLY, but unfortunately it does not work due to software-technical reasons (bug). They are currently trying to recreate the setup in the lab and may deliver a fix in the future. No one at Apple has been able to tell me which cable to use. Nevertheless, I have already tried several cables, including the one from Moshi (currently the only 5K USB-C/DP cable on the market). Changing the DP version on the monitor (1.0, 1.2, 1.4) or the refresh rate on the monitor does not help. However, if 120 Hz is selected, OS X still sees the display as 5120x1440 via "About this Mac > Displays", even if a change via "System Preferences > Displays" does not bring the necessary native resolution.

What I can currently say:

- OS X (Mojave & Catalina) + this monitor are not friends.
- Even if 5120x1440 can be selected, native is a different resolution and the rest is scaled by software (looks accordingly).
- Also the Moshi 5k USB-C/DP cable does not work.
- Changing the refresh rate doesn't help, but at 120Hz OS X at least sees the display with the correct resolution.

As a workaround:

- Connect two cables and use the PBP feature of the monitor.
- Advantage is that the monitor can be used
- Disadvantages are only 1 menu bar (left or right) and almost no settings can be set on the monitor (incl. 3 faviourites do not work).