cm08tx
2 Bronze

Re: U2720Q, MacBook Pro, 29Hz?

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I have a 2018 Mac mini. I noticed after I enabled Smart HDR on the monitor, the input signal switched from 30Hz to 60Hz. Here is what I did to make that happen:
 
On Dell U2720U Monitor's OSD (Firmware M2T101):
Display -> Smart HDR -> Changed from “Off” to “DisplayHDR”
 
On 2018 Mac mini (macOS Catalina 10.15.4):
System Preferences -> Displays -> Checked “High Dynamic Range” box (I also selected Resolution: Scaled -> “Looks like 2650 x 1440”)
 
Now I see the 60Hz signal being received in the Dell U2720U Monitor’s OSD:
Others -> Display Info -> I now see 3840x2160, 60Hz 30-bit

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RandallC75
2 Bronze

Re: U2720Q, MacBook Pro, 29Hz?

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Turning on Smart HDR worked for me!  In Desktop mode.  Now I get 60Hz...phew.  30Hz was making me crazy.