@apspencer I’ve seen a variety of reports here about problems with macOS Monterey systems and Dell USB-C displays, including loss of USB data connectivity over the USB-C link. For people with systems that were originally running a previous OS, the issue occurred with the update and goes away if the system is rolled back. But the 2021 MBP can’t run anything older than Monterey. It’s not clear whose “fault” the issues are or who would be able to implement a fix/workaround since to my knowledge underlying cause hasn’t been identified.
But on the off chance that these problems have you considering a different display, fyi a 27” 4K display is a rather poor choice for a Mac, for reasons I described in the post marked as the answer in this thread. So you might want to consider a display with different specs at that point.
USB-A (particularly USB 2.0) through USB-C is a tricky beast, your cable has to support it. Has to include additional 4 wires specifically for USB 2.0. I have no clue how you can find out if the cable you see in a shop has it or not.
The original Dell cable supplied with the U2720Q has these wires.
I had "flickering" problem with my M1, I thought it was the cable. I bought Baseus, Hama cables (high-end ones) but they don't seem to include the needed wiring. So I lost USB-A functionality and the flickering wasn't gone completely either
I upgraded my Big Sur a couple of times, I think the newest update might have solved the problem, the flickering is gone (knock on hard wood...)
Now I went back to the original Dell cable, USB-A is back and the world is just beautiful.
jphughan
9 Legend
•
14K Posts
0
December 2nd, 2021 05:00
@apspencer I’ve seen a variety of reports here about problems with macOS Monterey systems and Dell USB-C displays, including loss of USB data connectivity over the USB-C link. For people with systems that were originally running a previous OS, the issue occurred with the update and goes away if the system is rolled back. But the 2021 MBP can’t run anything older than Monterey. It’s not clear whose “fault” the issues are or who would be able to implement a fix/workaround since to my knowledge underlying cause hasn’t been identified.
But on the off chance that these problems have you considering a different display, fyi a 27” 4K display is a rather poor choice for a Mac, for reasons I described in the post marked as the answer in this thread. So you might want to consider a display with different specs at that point.
TheAkosG
5 Posts
0
January 30th, 2022 09:00
USB-A (particularly USB 2.0) through USB-C is a tricky beast, your cable has to support it. Has to include additional 4 wires specifically for USB 2.0. I have no clue how you can find out if the cable you see in a shop has it or not.
The original Dell cable supplied with the U2720Q has these wires.
I had "flickering" problem with my M1, I thought it was the cable. I bought Baseus, Hama cables (high-end ones) but they don't seem to include the needed wiring.
So I lost USB-A functionality and the flickering wasn't gone completely either
I upgraded my Big Sur a couple of times, I think the newest update might have solved the problem, the flickering is gone (knock on hard wood...)
Now I went back to the original Dell cable, USB-A is back and the world is just beautiful.