Big Sur 11.1 External Display Issues!

Today I had an remote call with apple care support.

the guy realized that he with the official apple remote support see my monitor but I can not see nothing.

he was so helpful trying to help me and admited that a lot of problems related with monitors and external devices.

next saturday I have a call to execute a software to trace a lot of logs and errors and send it to apple engenering..

lest’s see

The same issues started after installing Big Sur 11.1 on a MacBook Pro (15-inch, 2017) with LG 34UM95-P monitor. After trying many suggestions, the final solution was to go into LG monitor settings and enable DisplayPort 1.2.

Note that I also use Boot Camp and Windows had no problems detecting the external display. So, it doesn't seem to be computer hardware, monitor, or cabling issue.

Hi folks!

Same problem (27” Benq monitor with USB-C) but try this old app from App Store - Display Menu. It works, including 60 Hz refresh rate for 4K res monitors.

Until someone from Apple fix it this let you work.

This didn't work for me — maxed out at 30 Hz with 2019 16" MBP and BenQ PD2700U via USB-C to DisplayPort. Not unusable, just annoying. When I change back to DisplayPort 1.4 on monitor, I only get 1080p HD. DisplayPort 1.1 gives me 4K but only 30 Hz.

According to apple support nothing is the matter, if so they would be overwhelmed with complaints... it somehow seems not to reach them. Apple support here in Holland only could react after i re-installed everything. I am facing a deadline and have no time to spend in actions of which i know from you all that it does not work...

So it sees we all should complain on the website of apple itself.?

Does anyone else have their external display function properly at random for about a day? So strange, I am still trying to figure out what I do that makes the external display function at 4k once in a while. Goes back to a pumpkin after sleep.

My computer froze yesterday so I force restarted by holding the physical power button down (USB-C external display cable was plugged into the MBP), when it restarted the display was back to normal, showing 4k. Twilight Zone music here.

Then, this morning after MBP sleep, it was back to it's glitchy low-res self. I restarted (regular restart, not the power button) with the USB-C cable plugged in and the display was back to 4k. Not without a fight, the monitor was "off", it would not display anything, so in my display preferences and clicked on "gather windows" button at the bottom right, and switched the scale to something else and back and the display turned on.

There seems to be no rhyme or reason, I've tried restarting before and had no results, but the display has worked properly twice this week. It's so intermittent I don't understand it. This is not a solution, and I don't think it will work consistently, but I found it peculiar. The display shows up at 4k maybe once a week without having done anything at all, this time I tried to replicate it and got it to work this morning. No confidence that this will work tomorrow.

It's the same here, I can't exactly understand the combination of plugging the cable in, restarting the system and adjust the settings in the system settings. Sometimes it works - sometimes not. 30 HZ. I use a BENQ 4K EW3270W and a HUION 24 Pro Pen Display on the Mac Book Pro 16.

Still hoping that will be fixed in the near future.

Hi all,

I just received a call from apple care (Spain) we agree this call to make some diagnose tool and send logs to Engineering.

Finally we didn't run the tests because the guy told me that Apple now recognizes the issue, they have found what it cause and they are now working on the solution.

Good news, a mess this past weeks but for me good news.

> Upgraded to macOS 11.2 (20D53) today, type-C - DisplayPort with BenQ PD2700U works properly.

Let's see next Monday when I go to work.

No lucky this Monday. I am using HDMI(with switching scales to get it work) back on 60Hz now.

The point is that the issues are (as far as I know) only with no apple branded displays and cables. By considering that, this bug has the lowest priority for Apple. The will fix it, I’m pretty sure, but it’s not a high priority.

Sad but true.

This fixed the problem for me, was I was stuck on 1080p on my 27" 1440p Asus display that didn't have options of changing display port version. With the Display menu app I was able to choose 1440p @ 60Hz.

I'm confirming, again, that restarting my computer by only holding down the physical power button on the keyboard is working for me to fix this problem, daily. I'm not holding down any other key on the keyboard, just the power button to shut off and again to turn on. Seems like a desperate move, but it is working for me.

MacBook Pro (16-inch, 2019)

It's not without momentary display glitches once in a while, like pixelated, fragmented, or strange bright green colors on some images when dragging them from built in display to the external. For the most part it's for a split second. And rarely, the glitches remain with viewing files in Photoshop like gray blank spots, then when I drag to the built in display, the file is ok.

To add my pennies to this thread.

I'm using a BenQ SW271 on a 2020 5k iMac using Big Sur 11.1

I have most the problems described in this thread. Initially with the USB C to USB C cable supplied with the BenQ, then with a Benfei Thunderbolt 3 to Display port cable and finally a Moshi USB C to Display Port cable as recommended by Apple support.

What I have come to realise is that the problem is with the USB/Thunderbolt interface on the iMac. When the problem occurs - whenever first booted or when power save mode turns off the displays - I have only to removed the USB C / Thunderbolt connector from the iMac, wait 3 - 4 seconds and then reconnect. No other actions necessary on the BenQ or with the Display Port connector. On reconnecting the iMac recognises the BenQ and restores the display at native resolution (3840 x 2160) using 60Hz refresh. All is then well until the next time I reboot or power-save mode starts.

Andy

Andy's solution seemed too good to be true; and for me it is. I continue having the problem having tried everything short of reinstalling Catalina, which I am loath to do, partly as I understand when you reinstall backup you need to go to last Catalina backup and I've been backing up on Big Sur for over a month.

I have a 4 day old Macbook Pro and a 2 year old Vizio monitor which worked perfectly. The 11.0.1 upgrade came through and it was like darkness descended in my universe, the monitor connection literally died in front of my eyes. I did the resets mentioned here, nothing, switched from C connection to HDMI port, nothing. It's like there Shall Be No External Monitors Henceforth. I don't know anybody that doesn't have at least 1 monitor and usually 2-3, is this real? This is the way it is supposed to work? HELP!!!!