So Your iMac has Thunderbolt Ports (type C) and I'm assuming your Monitor has a USB Type-C input. I don't know if I've been helpful, I only hope I was helpful. A temporary breaking of the non-video connections with an adapter cable will at least prove to you if the source of the problem is in the video signal or some other signal the USB-C cable carries. If you do care about these connections then that gets back to doing more investigation to the cause. If all you care about is the video signal to the display then there should be no issue in breaking these non-video connections. If a different cable resolves the issue then the problem is solved even if you don't know for sure what the problem was in the first place.Ī USB-C to DisplayPort (or whatever port) cable would break many connections between the computer and display, any of which could be the source of your problem. These cables aren't free, and I suspect you don't want to spend a lot of money on resolving this, but they aren't exactly expensive either. As an example if your display has a DisplayPort input then find a USB-C to DisplayPort cable to connect the computer to the display. It is possible there is some hardware issue in the display, cable, or computer that is causing this crash and if you workaround this issue you can keep using the display without crashing. If you have some other port on the display to connect to the computer then try that. If the display has a USB GPU then look to a driver issue as the cause of the crash. I have not seen a display with only a USB-C input except portable displays that use DisplayLink or some other USB GPU. I believe you need to do some more investigation into the cause and see what can be done to avoid the cause. Without knowing more about the monitor it's difficult (for me at least) to offer a resolution. Panicked task 0xffffffe199ffc630: 2882 pages, 189 threads: pid 0: kernel_task Here is one of the crash logs: panic(cpu 1 caller 0xfffffff023abfa08): x86 CPU CATERR detected So I wonder is there any other way I can use a second monitor apart from connecting it via USB-c? Is it possible to use a Bluetooth dongle to my second monitor? Are there any other ways? So support essentially is useless for me and I have to deal with it by myself. I know that this monitor works great with other computers and it's not the only monitor I tried with my iMac. I've been struggling with it for over 8 months and I know for a fact that it reboots only when I connect any 2nd monitor! Apple thinks I should go to the monitor's manufacturer or to Adobe (since I use Photoshop). Nobody at Apple is willing to admit that iMac has a malfunction. I've been through apple support so many times! I gave my iMac to Apple Genius etc. My iMac 2020 reboots when 2nd monitor is connected via USB-c.
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