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Anyone experiencing no signal output to the external monitor using USB-C after 1...
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Anyone experiencing no signal output to the external monitor using USB-C after 12.3 upgrade
I just upgraded to 12.3 OS for my 2019 Macbook Pro 15 inches, and before the upgrade, it worked well with my LG 49 inches monitor by USB-C. However, after the upgrade tonight, it is saying that there is no signal to the monitor by USB-C. I can only use HDMI for the external monitor. Is there anyone having the same problem?
Last edited: Yesterday at 5:29 PM
whatthedeuce
macrumors newbie
Mar 15, 2022
Yes, just registered for this site to complain about this issue.
However it's on a 2018 Mac Mini for me.
Was using USB-C to display port which worked fine before the update.
It's my only monitor and luckily I had an HDMI cable laying around so I can actually use my computer.
However the colours are completely wonky on HDMI compared to Display Port.
However it's on a 2018 Mac Mini for me.
Was using USB-C to display port which worked fine before the update.
It's my only monitor and luckily I had an HDMI cable laying around so I can actually use my computer.
However the colours are completely wonky on HDMI compared to Display Port.
Same issue for me on the 2018 MacMini. USB-C to DisplayPort adaptor to my LG Monitor. Zapped the PRAM and nothing. The "workaround" is that I use the blank screensaver(yeah I know, not the same thing). I hope that Apple fixes it... Anyone tried to downgrade a driver or a plist??
Yes, I also have this issue with a 2018 Mac mini - annoying!
Hopefully there is a x.x.1 fix coming...
Hopefully there is a x.x.1 fix coming...
What brand of monitor are you connecting?Yes, just registered for this site to complain about this issue.
However it's on a 2018 Mac Mini for me.
Was using USB-C to display port which worked fine before the update.
It's my only monitor and luckily I had an HDMI cable laying around so I can actually use my computer.
However the colours are completely wonky on HDMI compared to Display Port.
jjayr41
macrumors member
Sep 22, 2016
Yup mine is broke as well using a LG 32in USBC monitor, was working great this morning before I updated....using m1pro MacBook Pro
Did anyone make a change of the displayport version on the monitor to let the monitor work again with USB-C? I tried, but had no luck.
jjayr41
macrumors member
Sep 22, 2016
I tried going from 1.4 to 1.2, unhook the usbc, reboot etc and back to 1.4 and no luck as well.Did anyone make a change of the displayport version on the monitor to let the monitor work again with USB-C? I tried, but had no luck.
Mac mini (6 core i5) with LG 32UL950 (display port V1.1), thunderbolt connection.
Monitor no longer works with thunderbolt connection after 12.3 update.
Monitor works with HDMI connection.
Thunderbolt cable tested on other thunderbolt devices, cable OK.
Disconnected monitor from power for 10 minutes, thunderbolt connection now working.
Odd.
Monitor no longer works with thunderbolt connection after 12.3 update.
Monitor works with HDMI connection.
Thunderbolt cable tested on other thunderbolt devices, cable OK.
Disconnected monitor from power for 10 minutes, thunderbolt connection now working.
Odd.
knoepflasdruecker
macrumors newbie
Mar 16, 2022
After changing the OSD settings of my display (LG 27UN83A) from DP 1.4 to 1.2, it works again over USB-C. Many thanks for the hint!
whatthedeuce
macrumors newbie
Mar 15, 2022
Mine is a Samsung 28" 4k monitor.What brand of monitor are you connecting?
whatthedeuce
macrumors newbie
Mar 15, 2022
Interesting. Mine only supports 1.1 and 1.2 and is on 1.2 but doesn't work(but used to work). Tried changing it to 1.1 but doesn't work for me.After changing the OSD settings of my display (LG 27UN83A) from DP 1.4 to 1.2, it works again over USB-C. Many thanks for the hint!
Last edited: Yesterday at 4:43 AM
jjayr41
macrumors member
Sep 22, 2016
Really odd, so I gave up last night and just unplugged the power to my LG monitor overnight. Shut down my MacBook Pro as well. This AM, I plugged in the usbc cable to monitor and fired up the Mac...it works now. It even works on 1.4 or 1.2 now....I don't know what changed but looked like my display settings on the Mac was reset as the backgrounds changed etc.Mac mini (6 core i5) with LG 32UL950 (display port V1.1), thunderbolt connection.
Monitor no longer works with thunderbolt connection after 12.3 update.
Monitor works with HDMI connection.
Thunderbolt cable tested on other thunderbolt devices, cable OK.
Disconnected monitor from power for 10 minutes, thunderbolt connection now working.
Odd.
Reactions: Spanther
Spanther
macrumors regular
Dec 14, 2020
My external monitor support is already flakey with the 14 M1 Pro via USB-C.
Guess I'm skipping this update until a fix is released.
Guess I'm skipping this update until a fix is released.
ResPublica
macrumors regular
Jun 12, 2011
My old 24" monitor refused to start after the 12.3 update (no LED-light)... I though it was broken or that there was something wrong with my power cable. In the end, it started to work again on its own. But since it happened right after the update, it might be related to what people describe here.
Mygoodgomez
macrumors newbie
Oct 26, 2021
Yep, same problem here. LG 27UK850-W monitor via USB-C cable I've used for years to 2018 Mac mini stopped working after upgrading to 12.3. Switching to HDMI gets things to work but colors are off.
Akito
macrumors newbie
Mar 16, 2022
Same for me. Purchased a brand new cable and LG 27BL85U-W a few days ago and it's been working fine via USBC. Right after the update? nothing. It will recognize the MacBook is plugged in, but will shut off about 10 seconds later and reconnect. Same thing, over and over. 2020 M1 MacBook Pro. Oh, HDMI works just fine, but dammit, I've been spoiled by USB-C. A fix would be pretty great right about now.
Last edited: Today at 7:57 PM
bandits1
macrumors newbie
May 18, 2017
Same or at least similar on a 2018 Mac Mini + LG 27UK650 connected via StarTech USB-C to DisplayPort cable. Startup and login goes fine, type in my password and then blank, nothing. I hear my external HDDs spinning up and my desktop setting up like normal, but I can't see anything. Tried restarting twice, reset PRAM and still nothing. Swapped out USB-C for HDMI, restarted one more time and, except having to reset the monitor scaling back to 2560 x 1440, everything was good again.
I'm okay running with HDMI, just pissed about the $27.99 I spent on that certified cable 3.5 years ago haha.
I'm okay running with HDMI, just pissed about the $27.99 I spent on that certified cable 3.5 years ago haha.
Last edited: Today at 12:39 AM
Reactions: Mygoodgomez and Akito
iMac 2017. Have a type-C powered portable 15" 1080p display. Used to work 12.2 and before but with 12.3 it stops showing at all. The display OSD has no ability to change DisplayPort version, and then with just 1080p I doubt it is even using a modern DP version.
Oh well. Typical modern Apple software...
Oh well. Typical modern Apple software...
I connected the external monitor with my Macbook pro 2019 via DisplayPort now and it is working fine, and the USB c port is still not working. However, I still prefer using USB C as it can power the laptop with no use of the adapter coming with the it.
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