External Monitor flickering issue on M3 MacBook Pro

Update. Chatted with support and apparently the only fix if you want to use HDMI or Thunderbolt to HDMI you need to lower the refresh rate even if the monitor supports the higher rate. I moved mine from 60hz to 50hz and it resolved the issue. However if I ever want to stream 4K/1080P at 60hz I will have to manually change it back.

Apple needs to fix this issue because a monitor that supports 4k/1080P at 60hz should just work...especially since my old Macbook Air (2020 M1) had NO issues and worked fine with the same monitor at 60hx refresh rate.

I noticed the original post mentioned a Disply Port set up, I cannot speak to that option as I only have the HDMI and USB-C to HDMI set up.

A FIX! Updating myself here for anyone else who is experiencing issues:

I ordered a HDMI 2.1 cable and went direct from the monitor to the M3 Mac HDMI Port.

It allowed me to go up to 2k 144hz on my monitor (great). So far, no more flickering!

I was also experiencing audio noise from my interface while this was going on, and apparently the two were related. This Mac apparently does not like 60hz!

So, if anyone else is having issues. Try to get off 60hz refresh rate on whatever display.

Hope this helps.

FIX:

If I have the USB-C cable connected from my MacBook m3 to my monitor (Video), and also the power cable connected to my Mac (MagSafe). Flickering disappears completely.

It seems something related to power delivery on MacBooks M3

I found a fix I posted here:

External Monitor flickering issue on M3 M… - Apple Community

Basically, I used an HDMI to USB-C cable so its not using the HDMI port on our M3.

The flickering stopped!!!

However I wish for Apple to fix this. If its an HDMI port issue, the M3 should get a recall and replacement machine if fixed.

Did you try a different cable, or a different connection altogether, like direct USB-C or HDMI (if the monitor supports them)?

I have this issue with my M3 Max. The flickering and strobe effect happens on certain websites, and exclusively on my Firefox. I tested the same sites on Safari and is not replicating. Have not tried Chrome as I don't use it. Maybe its only a browser issue (which I first at first) but I have not tested Safari long enough (not my main browser) to see if its happening on other websites. but then I found a fix!!

I tried the suggestion of one user reply here to switch to 50 hertz but that didn't fix it.

I tried different HDMI cables and have the same problem.

I have a HDMI to USB-C cable that I used on my previous MBP and didnt find use for it now since there is a new HDMI port on the M3. Miraculously it works now!!!

So I would assume based on this test it is the HDMI port that is the real issue as the adjacent USB-C port I use now solved the problem. I am a bit ****** off at this, since I have to give up one of the USB-C ports since the HDMI port failed... I don't know where to plug my other external drive, but will do for now, better this than flickering. However I hope Apple has a fix for this, or get a recall on this so we can use the port like intended.

There has always been a major problem for every new model I ever bought from Apple. Please fix this!!!

I just experienced the same issue. Ieven have the same monitor. With DisplayPorto to USB-C cable I had to switch from 60Hz to this "Variable (40-60Hz)" and it stopped blinking.

EDIT: ok, I celebrated success too early. Still blinking but not all the time.

I switched back to 60Hz and set the scaling of the monitor to its maximum, and that has improved things noticeably. I'll see occasional flicker, but not like it was.

Have you tried a DisplayPort to DisplayPort cable?

I notice the flickering when there is a lot of black on the monitor. I'm trying the downgrade to 30Hz to see if that helps. So far, so good.

direct to USB-C worked

That failed after awhile. I have switched my monitor's resolution to the maximum and back to 60Hz to see how that works.

I have the same issue with my brand new MacBook Pro M3 Pro. The monitor (4k 60hz) I previously used with my MacBook Air M1 (2020) never flickered and from day 1, the new MacBook M3Pro does. I even upgraded all of my cables as well...I did noticed it flickers the most on black screens which is a problem because I usually default to dark mode in most applications.

I just bought a Macbook Pro M3 Pro and I'm also having display issues.

27" 2k 144hz Acer IPS. Works perfectly fine with my two PC's and my old 2020 Macbook.

Very very frustrating. I use my computers docked with external peripherals 90% of the time.

If a new cable does not solve the issue, I will be returning the laptop unfortunately.

Unacceptable with a "Pro" product.

Updating 2 months later:

This is still an issue. The new cable helped.

The monitor still has that weird banding/flickering issue depending on what is on the screen. Very dynamic, lots of black scenes will cause it to happen.

Very odd and dissatisfied. Maybe when it's time for an upgrade I can switch to a PC.