Mac Mini M1 Screen Flicker with Ben Q displays.

Question

Mac Mini M1 Screen Flicker with Ben Q displays.

I work on a Mac mini (M1, 2020) with Monterey 12.1 installed, I have it connected to two monitors, both are 27" BenQ PD2700U. One is connected via display port (usb-c --> HDMI) and one is high quality HDMI. My other USB-c slot is used to connect to a server. I have random issues with extreme screen flicker and "ghosting" of windows. I have tried all new cables, swapped cables between monitors, restarting, updating, all the general work arounds. Has anyone else had issues and found solutions with this? I am a colorist who works in davinci resolve so this can be extremely frustrating. Thank you!

Posted on Oct 27, 2021 8:22 AM

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Answer 1

Nov 14, 2021 11:52 AM in response to mccello

As the variable refresh rate is on also because it's on on the display (Freesync, normally) meanwhile, if you're not interested in it, disable Freesync into the display settings.

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Answer 2

mccello

Level 1

9 points

Nov 12, 2021 7:25 AM in response to ShaneConverse

Same problem here on a Mac Pro (2019) on Monterey.

After system boot the Benq refresh rate is set to 40-60 Hz (variable), you have to switch it back to 60 Hertz, then no more flickering.

I wonder why the system can't remember the settings after a reboot.

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Answer 3

Oct 28, 2021 10:39 AM in response to ShaneConverse

Hi ShaneConverse,

Thank you for posting in Apple Communities. Regarding the ghosting, try the steps mentioned here: Avoiding image persistence on Apple LCD displays - Apple Support (DE)

Regarding the flickering, does this appear to be happening with a certain part of the screen? If only one monitor is connected, does the issue persist?

Take care.

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Answer 4

Nov 13, 2021 2:39 AM in response to ShaneConverse

12.1 or 12.0.1? The first is not yet released and cannot be discussed here as per forum's rules. The second is known to have problems with external displays. Hope 12.1 will fix them.

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Answer 5

Nov 12, 2021 7:41 AM in response to MichelleT18

yes the issue continues with one monitor. I have even sent back both BenQ displays and gotten new ones. No change at all. Its the entire monitor, not just a portion of it.

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Answer 6

Nov 12, 2021 7:42 AM in response to mccello

Mine never changes upon reboot actually. Its always at 60 hertz. Same problem persists at random for random lengths of time.

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Answer 7

Nov 13, 2021 4:35 AM in response to majortom1967

12..0.1 - it happened on Big Sur as well. Not a new Monterey related problem.

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Answer 8

Nov 14, 2021 11:57 AM in response to ShaneConverse

Yes, it's an M1 or more probably an M1/Mac OS issue, mainly. Me myself I have different problems on my external display and still waiting for a solution. Can happen but should have been solved since. Just let me say that if 3 different cables give the problem doesn't mean a 4rt can't solve and that many cables sold as per high quality, often aren't. Of course, we can't order tons of cables in order to get a solution.

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Mac Mini M1 Screen Flicker with Ben Q displays.

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