After updating to Beta 8, I can't seem to get my external display to work. The backlight on the monitor turns on and it seems to interpret some data from the MacBook briefly displaying a flash of colors and then going black with the backlight still on. The Display is still fully function on a different Mac.
Macbook Pro 2016, display connected to external thunderbolt 3 hub.
I have seen the same behavior, my LG UltraFine 4K display just stays black and it is directly connected into the Mac Thunderbolt port. From what I have seen in other discussions, this seems to be limited to Intel based Macs and is a new bug in Beta 8 (M1 based Mac's seem not to have this problem). I have filed a bug report to Apple and hope they get it fixed as quickly as possible. It feels so strange to depend on the built in display and only have one display available and have the big black screen right in front of me.
I had tried resetting NVRAM and SMC and no change, monitor still stays black. Also connecting original power supply is not making it work. Interestingly, USB devices connected to the monitor all work and the monitor shows up in the system report as connected to Thunderbolt / USB4 but it is not recognized as a Display device in the system report nor the system preferences. System preferences only has the internal display available.
Yep, identical description and issue. Thanks, let me know if you hear back on the problem report.
Yes I will post here if I should hear anything back from Apple. Well the big hope is that we will get a new release latest next week with this hopefully being fixed. Let's keep fingers crossed.
Identical description for me as well... that's what betas are all about, they say. Let's hope we have a fix sooner than to expect another beta release, maybe a patch file, a workaround or even a new version of the same beta.
Same here. I cannot work without external displays... I'm in depth trouble here :(
First display (Thunderbolt Display) doesn't show up in system report, yet it displays boot information on it early on in the boot process. The second display (thunderbolt to DVI) comes up as the login screen. Since the primary doesn't show up in the "System Report" it feels like something broke in device discovery and enumeration. (2013 Mac Pro trashcan). Worked fine in previous betas.
Plugging in with HDMI to USB-C works for me as a temporary fix with my BENQ PD3220U. Hopefully a fix will come soon.
same here MacBook Pro 2016 with a Samsung 4k monitor no matter the connection (display port hdmi) it stopped working and of course in another Macbook 2016 with Big Sur the external monitor works
Got the same thing happening with a 2015 iMac + an external Apple display.
Got the same problem with Mac Pro 2013 version and AOC 4K Display.
What I find interesting about this is that I have 2 MBPs (2016 and 2020 both Intel) and the 2020 is working as expected but the 2016 is not. I don't know what that means in the big picture, but it is not widespread on all Intel Macs. Good stuff...
Same with Benq and Displayport.
As a workaround, I installed Beta 6 (complete pkg) over beta 8 to restore my display use. I guess the solution will be in the next beta (9).
Same issue here - my trackpad also stopped being recognized
I just installed Beta 12 and the problem with external monitors continues, at least in Intel models.
This is so annoying and I know Apple doesn't really care since this is Beta code but I have been forced back to using a Windows laptop (Yuck) because it supports an external display.
Where can you download beta 6? Same display issue.
Beta 9, released today (Wednesday, October 6th), apparently resolved all this issue. I just installed it over Beta 6 and everything went ok.
Same problem here BETA 12 - Dell monitor connected with DP
Beta 9 installed over Beta 8 still exhibits this problem for me.
Hi. Macbook pro 15" late-2016 owner, experiencing same bug with both my Dell, USB-C 4k P2721Q and my Thunderbolt display (with USB-C adapter), on Beta 8.
Just updated to Beta 9 (released today) and it's now fixed!
I had this problem with beta 8. None of my external monitors would work, and the "workaround" also didn't work. I just installed beta 9, and I'm back in business.
I still have the issue with Beta 10 now.
Same problem for me. I have MacBook Pro M1 and LG 4K connected with usb-c thunderbolt cable. No video on external display.
MacOS Monterey 12.0.1
Same for me. Downloaded Monterey 12.0.1 on an older (Intel based) MacBook Pro with a Thunderbolt connection to a Lenovo P27h-20 monitor. Used to work perfectly on the previous OS; however, this time it is the laptop screen only...
