How to fix refresh rate Issues on Dell monitors after Sonoma update

Same problem here on a MacBook Air M1 2020.

Using a Philips PHL 272PV 27" display.

Using refresh rate 60 or 50 Hz no signal, 30, 25 and 24 Hz no problem.

Same issue here after the upgrade. Macbook Pro 15(Intel)'' -> CalDigit TS3Plus -> Gigabyte MU28. Works fine in 24hz, black screen in >= 60hz.

You don't have to use the built in cable. Just use a TB2 cable connected directly to one of the TB ports on the display.

same issue with Samsung 34 inch curved monitor. monitor is recognized for a second or two before disconnecting and this repeats. unfortunately monitor has only 50/60Hz options and monitor doesnt work in either settings.

Similar issue here any suggestions?

imac 27” 2020

thunderbolt display

for years they’ve worked flawlessly, after Sonoma upgrade every time my imac goes to sleep overnight and I wake it up the next day - the Thunderbolt Display is not recognized. I restart and everything works.

not ideal. :(

Same here.

My MacBook Pro with

Processor: 2,6 GHz 6-Core Intel Core i7

Graphics: Intel UHD Graphics 630 1536 MB

is unable to connect to the thunderbolt Display after the upgrade to Sonoma (14.0).

I can connect, but after a few seconds the display goes black. I tried restart with Option+Command+P+R key until 2 times restart sound (resetting NVRAM/PRAM), unplugging the power from the display and waiting 10 seconds. Nothing works.

I have an adaptor Hper that has two HDMI ports and before I installed Sonoma 14.1 in displays I could see my two external monitors and my mac pro 13in M1 2020 - the adaptor has a thunderbolt and plugs into one on the computer. After update and installation of Sonoma...on or in the displays I only see one monitor and my macbook...I have tried unplugging power and cords and sleep mode...etc...nothing changes...one screen is black and the other works....how can I fix this?

Yes same. Not a webcam here but an external hard drive… it won’t mount or dismounts or randomly ejects improperly the time since Sonoma 14.0 update. So frustrating I was fearing it would eventually cause the drive to go bad.

BUT…. Notes in Sonoma 14.1 say it fixes that issue. And so far a few days in after updating I think, it’s not ejected once. Crossing my fingers...

Wish I could same the same about my M2 Air, I upgraded from Ventura to Sonoma on my M2 Air and have had this problem ever since. Mater fact I discovered today that 14.1 has actually taken a step backwards. Not only does my monitor not work when I reboot but the webcam that is connected to the USB-A port on the monitor is no longer recognized at all. Nothing I do brings that back.

I thought a well designed HUB like Caldigit would help but I too am having issues with many third party devices particularly my Dell and LG monitors. I have four USB-C in my Intel MacMini so I am getting by but with my M1 MacMini I don't have the luxury and often have to reset my HP monitor by turning off and on for the M1 to recognize it.

2020 27” iMac and Apple 27” Thunderbolt Display

Wow. 14.1.1 just regressed. 🤦🏻‍♂️

14.0 was terrible. Apple Thunderbolt monitor would disconnect and my external hard drive would eject improperly daily.

14.1 both worked well. Did not happen at all. Monitor and Externals stayed connected

14.1.1 monitor and externals disconnecting randomly again.

awesome Apple. Great job, I’ve literally been using Mac since 2008. Leopard then Snow leopard and every major OS since I’ve updated instantly and really been seamless. UNTIL Sonoma.

What an absolute sh!+ sh0w

I've been running Mojave for 5yrs now, I use a Diamond DS3900PD external Triple display docking station with two LG displays. A third LG display is connected directly to my 2.7 MBP i7 . Yesterday I did a clean install to Sonoma and I am now experiencing display issues.

The display connected directly to my MBP works fine. The 2nd Display connected to the 4k HDMI port on the Diamond DS3900PD also works fine. Now the display connected to the 2k HDMI port on the Diamond DS3900PD stopped working. frustrating to say the least

What I found was that resolution is not coming up properly. For my hp27xq which supports 2560 X 1440 resolution is only able to give 1920 X 1080 resolution. SS attached.

also this was working fine before upgrading to Mac OS Sonoma.

If anyone can help with this, it would be much appreciated.

Thanks

Yes Sonoma is broken..I've been working with 3 external monitors for the past 5 years, Mojave has been solid. I also use Fusion to run a work Win10 image on a daily basis. This setup has been solid for me...well Sonoma has put a spin on things now.

Right I don’t get it. It’s clearly not a cable issue…. especially for me when my “APPLE THUNDERBOLT display” Thunderbolt cable literally cannot be removed from the display or replaced - it’s attached to the inside of the display by Apple. 😂

it’s just unbelievable it’s been this long and still no fix. This is a major issue and causing lots of issues for many home offices like mine.

27” iMac (2020)

27” Apple Thunderbolt Display

wish it would “just work” like it did for the past 4 years 🤷🏻‍♂️