Big Sur 11.1 External Display Issues!

Hi,

I have a Macbook Pro 13 2020 and two LG 27UL850's. One is connected via USB-c to the Macbook directly. The other is connected to a Dell dock. The Dell dock is connect to the Macbook via USb-C. Prior to Big Sur I could use the Displayport connection on the Monitor. Now I have to use HDMI.

I would like to switch to DisplayPort, but when I do the screen goes black. Switching to DisplayPort 1.2 doesn't seem to work. Any help would be appreciated.

To those of us with LG 32DU99s connected via usbc, how’s the latest update treating our monitors? I been sitting pretty on 11.3.1 and dare not to upgrade until I can confirm I’m not going to lose my monitor for who knows how long again.

That’s unfortunate. I went ahead and updated to 11.4 and my LG 32DU99W like others have reported still works via USBC, knock on wood. @Triny D, you should report your monitor models to prevent others the headache, just a suggestion and hopefully Apple decides to dead this issue once and for all.

I think something is wrong with the 11.4 update, too.

(MBP 2019 with external BenQ SW271)

There's some kind of glitch when I view images on Photoshop, in that I can only see a giant block of bright green on the entire files. It is intermittent. When I restart, it seems to go away, and the problem then returns later on. This was happening during the 11.1 update, then it seems to have been repaired in 11.3, then it returned in 11.4. I did not have this problem before 11.1.

It could be Photoshop did not update yet. Who knows, they have a world of problems of their own. But Photoshop wasn't the one that glitched my external monitor in 11.1.

I am having the same issue with a 2018 15 inch macbook pro connected to a Samsung 50 inch 4K TV via USB C to HDMI adapter. This setup has worked flawlessly for two years, until I upgraded to Big Sur last week. Now when I plug in, sometimes it only offers me 1080P and instead of identifying the display as a Samsung, it just sees it as "Display".

This is severely impacting my workflow.

Come on Apple, fix this problem or at least give us some feedback that the problem is being worked and when it might be fixed. I'm still running Catalina on my MacBook Pro 16" 5600M with two Apple Thunderbolt 2 Displays (daisy chained) because I refuse to upgrade to Big Sur and not be able to use my Apple external monitors. The way it's looking, I probably won't get a chance to use Big Sur if the problem doesn't get fix prior to Monterey becoming available. Pretty sad.

Well while on 11.4 today my monitor (LG 32DU99W) randomly went back down to prefix resolution, 1080p max, and not even installing Catalina fixes it this time. Guess I’ll be selling this thing before it loses more value and see how the updated 16s handle externals 🙄

Hi, curious to know have you got it to work?

I just got my MSI PS341WU monitor today, and is about to get an M1 Mac Mini, but seems like there are lots of issues about it.

So... any information would help, thanks!

Hello. I'm note sure if my problem is the same. My MacBook Pro i9 slows down terribly when the external Monitor, a Samsung is connected. I had some issues already before installing Big Sur (11.4), but now it's very noticeable. Cinebench R23 drops from around 8000 to under 1000 when running it multiple times with the external screen on. Software including the Finder goes very slow and nearly non reactive after a short time.

Mine used to work too on 11.4 but it randomly decided to no longer work and no amount of going back to Catalina and back to 11.4 was able to fix it for me. So depressed with the situation and having to move back to Windows to develop that I cleaned the thing and it’s going on Swappa tomorrow. Maybe I’ll repurchase another in future if things are sorted out with new releases.

Nevermind. I recently posted an update saying the issue was fixed with the latest update. Nope. Premature. It's not.

My 30" Cinema Display, connected via a USB-C adapter, does not wake back up after the Mac goes to sleep (despite the power of the display still being on). My other display, a newer Phillips 27", wakes up every time. But for whatever reason it does not seem that the Mac can figure out how to detect the Cinema Display connected in the USB-C port.

What a disaster. I've given up. Can't believe Apple hasn't fixed this....

(PS I can't seem to find a way to delete my prior response on this thread. Possible?)

Same with my macbook. As for my 2010 mac pro, it wont register the external displays and is now completely out of service because it doesn't have a. built in screen. Yet, I can't get apple to help me because it's 'obsolete'. But when I boot up the same drive on my macbook i still have external display issues.

Since November 2019 the macOS-support for my fantastic EIZO 4K-Monitor is switching on and off randomly with every update.

Since 11.4 it's broken again and my 4K-Monitor stays black regardless if connected via HDMI or USB-C.

For I have a Mac Mini, this is an absolute No Go in 2021. Thank God I didn't sell my good, old Full HD Screen.

Also lagging Bluetooth which is annoying when using my Magic Trackpad, also WLAN connection-build issues.

This is all sub standard and feels like we're in the 90s.

Phone support one year ago was a comic experience.

And the engineers simply seem to not have much clue about writing clean and reliable operating system code that supports open standards.

Never mind--I locked the screen and when I reactivated the Samsung connected to the HDMI couldn't find the connection and needed to be connected to the USBc to HDMI dongle--not practical to keep restarting the computer after sleep when the USBc-->HDMI doesn't require it. too bad.

I have just updated to 11.5 and tried switch the second external display to displayport (it is connected to both hdmi and displayport).

This hasn't worked. See attached image. When I have switched to displayport on the monitor, it is recognised by the OS, but there is no image output.