10 Posts
1
87172
U2720Q, MacBook Pro, 29Hz?
Hi
I've this Macbook Pro:
MacBook Pro (15-inch, 2018) with macOS Catalina 10.15.4
CPU 2,6 GHz Intel Core i7 6 core
RAM 16 GB 2400 MHz DDR4
GPU:
Radeon Pro 560X 4 GB
Intel UHD Graphics 630 1536 MB
that I connect to my new Dell U2720Q (just arrived some days ago) with the U2720Q USB Type-C cable (C to C).
I rescaled it to 2560 x 1440
I noticed that randomly it's pretty slow. I especially noticed when scrolling webpages, moving cursor, dragging windows. Working all the day on that I'd say it's close to unusable.
From Apple menu > About This Mac > System report > Hardware > Graphics/Displays I see:
- Resolution: 5120 x 2880 (5K UHD - Ultra High Definition Plus) ==> why 5k? the monitor is 4k
- Appearance user interface: 2560 x 1440 @ 29 Hz ==> correct chosen resolution but strange Hz... why?
Then I tried a USB-C-->DisplayPort cable, keeping the rescale to 2560 x 1440 and it's a lot faster, smooth, I think it's how it should be. But, from System report now I have:
- Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition) ==> these seems correct, right? it's a 4k monitor
- Appearance user interface: 1920 x 1080 @ 60 Hz ==> why 1920x1080? I've chosen 2560x1440, indeed the visible resolution is like before, not smaller...
Then, after sometime I rechecked the System info and...
Randomly. I don't understand anymore.
Also, I will need to use the USB Type-C cable (C to C) for the charging feature (PD port).
Please, someone have never seen this thing? I need to solve as soon as possible
Thanks
RandallC75
5 Posts
2
May 1st, 2020 11:00
Turning on Smart HDR worked for me! In Desktop mode. Now I get 60Hz...phew. 30Hz was making me crazy.