Big Sur 11.1 External Display Issues!

Updated to the latest 11.5. My external display still does not work. After disconnecting/connecting my monitor displays video signal for about 5-10 sec. and then goes black and then I receive "no signal input" message.

iMac 27" 5K late 2020, thunderbolt 3 (USB-C USB-C), external display NEC EA271U.

Updated to Big Sur 11.5. It still crashes if you unplug and then plug back the external display, with a BenQ SW320. And BlueTooth is still lagging with Apple's TrackPad so keeping in a wired mode with the lightning.

I really don't get what's so wrong for Apple not to fix something like that. I mean they must get quite a lot of crash report on this one every week...

Yesterday I updated to Big Sur 11.5 on my MacBook Pro with new M1 chipset, hoping it fixes my issues I have with my external MSI MAG341CQ connected via HDMI port on an Anker USB-C PowerExpand+ 7in1 Media Hub.

Unfortunately it did not! Since Big Sur 11.1 or so, the MSI monitor operates at only 30Hz (3440x1440) and I also consider random input lags with my Logitech mouse connected via bluetooth.

I do not have those issues with the same setup when running my windows 10 laptop! I get a proper 60Hz output with the same exact resolution, also there are no mouse stutter or whatsoever.

I truly do not understand that those many complains people have are not recognized or even ignored by apple! I mean those products are really expensive stuff and apple is making a ton of money with it, so why the **** isn't this not already fixed? It is such a pain in the a** working with such a messy setup!

Please apple fix those issues, finally!

Still the same issues with an LG 38WN95-C.

Get the video signal for about 10 minutes and after screen turns black and no signal.

I tried with MBP 16 and MBP M1, none of the two works correctly. Screen plugged in TB3.

At the moment I only want to return my MBP if I can. It’s unusable.

Same issue. Just upgraded to latest Big Sur from Catalina on my iMac, 1 yr. old Acer monitor that worked fine before now won't connect. Upgraded to the 11.5., nada. Worked fine/great before. This is ridiculous. Guess I will have to uninstall and go backwards?

Yep so I'm here with the same problem. Just bought the M1 air, very very happy with it other than it doesn't like external devices. Did expect this problem - but shouldn't have to. I have an MX master mouse - which has connected without issues. Plus an LG external monitor, which right now is displayed neon pink & lime green. Which is seriously disrupting my work flow & giving me eye strain. So erm.. is this gonna get patched or are we basically waiting for the next OS.

If Apple Support reads this - I'm very happy with my M1 machine, I am not happy about this problem. My mother also uses Big Sur on an M1 macbook pro & she has had to buy a new bluetooth mouse to achieve a connection. These issues seem to be totally device specific to me (as in, its not a universal fix), which would explain why it has been so difficult to patch the issue.

Well...just bought a new J5Create USB 3.0 to HDMI (JUA354) adapter to connect 2015 iMac to Acer monitor, as my older (last year!) Insignia adapter did not support Big Sur. Couldn't get the new one to work after lots of trying, saw the new 11.5.2 BS (!) update, so just installed it. NOW my Acer monitor is working, but ONLY mirroring! And still doesn't show up in Control Center or Displays so I can't unselect mirroring! Wow, what an improvement. Is this stuff tested before getting put out there, and if so, with what? At least I know the monitor works with Big Sur...but a mirrored-only display is not the least helpful! Apple, what the heck??? I guess they ARE trying... :+O

I have a 2010 Mac Pro running Mojave. I was able to boot the hard drive with an external hard drive encasing through my MacBook. Since the MacBook has a built in screen I was able to access the drive and apple finally came out with an update that I performed and now my external displays receive the signal. I wonder how many people ran out and replaced their computers? My 2010 Mac Pro is upgraded and a great machine. I think it's ridiculous that apple literally refers to it as 'vintage' & 'obsolete' & even criminal that they stop allowing it to update. The fact that I can no longer air drop with my Mac Pro says it all.

Just bought a new Dell 2720Q and everything worked fine for a couple of days with MBP13 2020, 11.5.2. But this morning my monitor started running at 30 Hz refresh rate and it cannot be changed. The dropdown list is disabled. Tried to reset SMC - no changes.

Whats going on? How to fix this?

Macbook pro 16" , BigSur 11.6 on Docking Station HP-G5 with 2x HP EliteDisplay Monitors 27" .

The docking station is working great with other non-mac laptops.

On my macbook I only got it to recognize the external monitors once and they worked as one (mirror).

I tried all usb-c ports and the laptop crashed twice.

I would really like to know if this is OS related or if I need another docking station (and if yes which one would it be).

Either way, a huge disappointment for a 4.000$ laptop.

Having a similar, though not as disastrous result. The symptom is my external monitor cycles through a series of full-screen monochromatic displays of various colors when the MacBook is closed and the system goes into screen-saver mode. I've checked System Settings and nothing has changed. This has occurred with the upgrade to 11.6, on an M1 2020 MacBook Proc and a LePow monitor.

This is not just a Big Sur problem. I'm running Catalina 10.15.7. I have an external monitor that I like to switch back and forth between my Windows PC and my Mac. The Windows box has no problem with the cable being yanked out and then plugged back in - it detects whether the monitor is there or not and adjusts accordingly. The Mac gets confused and ***** its pants. How Mac ever got the reputation for "it just works" I do not understand.

By the way, I wrote "The Mac ... gets confused and poops it's pants". Except instead of poop I used another word that begins with "sh" and ends with "its". The forum software here apparently thinks that word is going to offend people, so it changed it to a bunch or asterisks.

My issue (external monitor cycling through test colors instead of going to screen-saver configuration when laptop times out into sleep mode) has been fixed. But that’s only one of the issues reported in this thread.

I'm not sure if this is the same problem I'm having (or related), but I think it is. I am using an external monitor (BenQ PD3220U) and I have a 2019 MacBook Pro.