P2721Q, MacBook Pro M1, flickers

Open the Pinned post at the top of this Monitors board = Dell monitor, Apple FAQ
None of the Dell D, E, G, P, S, SE, Alienware monitors have full macOS support from Dell. As a consideration to macOS users, on some of these monitors we did provide a macOS firmware update.

The online P2721Q drivers page, "Operating system" shows the supported by Dell operating systems.

Read the applicable threads on the Apple Forum to see if they found any workarounds.

Thanks for your response. But how to understand, "D, E, G, P, S, SE, Alienware monitors have" under which "letter" my monitor is?

P = P2721Q

And operation systems in Drivers page are only Windows. Does it mean that this display not compatible with my mac?

We are saying not supported by Dell. Read through the P2721Q threads on the Apple Forum. Maybe they have workarounds.

Hi, 

You are just answering just for answer?

None of that topic you mentioned did not helped. I read them first before writing here some topic.

Dell Support said this is a known issue with P2721Q monitor and mac M1/M2 chipsets. They provided the following "solution":

1. Use the Light Appearance on the Mac.
On the Mac, select: “System Preference” → “General” → “Appearance” → “Light”
Trade-off: macOS Auto or Dark Appearance cannot be used.

2. Use a 30 Hz refresh rate on the Mac.
On the Mac, select: “Display” → “Refresh Rate → “30 Hertz”
Trade-off: Video motion stutter due to low refresh rate may cause eye strain.

And said eventually:

If the fix will be provided via driver then it will be official rolled out on Dell Support site for all customer.