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RookieDroid
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December 6th, 2021 01:00
U4021QW, MacBook Pro, Thunderbolt source no display signal
After a long time sleeping in my MacBook at night about 5-6Hr, in the morning I can't get the U4021QW to connect and can't send commands from the keyboard with a built-in monitor dock to wake up my MacBook.
My MacBook can get 90w charging from the Thunderbolt port and my keyboard can get charging from a USB Type-A port. But no display signal on the U4021QW monitor.
- Dell U4021QW firmware M2T102
- MacBook Pro 2019 with macOS Monterey 12.0.1
- Keychron K2 keyboard
I have turn it off/on the monitor and restart my MacBook, not work.
I have unplug the thunderbolt cable, not work.
I have unplug the monitor, it's all back on.
I have another problem. I can't change monitor volume control. I fixed this by installing eqMac or SkeakerAme app.
Are there any known fixes for this?
try this workaround from the above link. Fairly sure the M2T102 firmware update cripples the monitor using Thunderbolt (vs just USB-C via DP alt mode).
it’s popping up more and more on this forum and Reddit. See if my post’s suggestion (even if the symptoms are different) solves the issue.
RookieDroid
1 Rookie
•
2 Posts
1471
1
Posted December 6th, 2021 21:00
I change the Thunderbolt port config display from 1.4 to 1.2, it's not work
Now I found the solution to fix it after sleeping macOS for about 10m+ the display monitor does not have a display signal.
I have turned off Auto Select for Thunderbolt function from the monitor menu.
@DELL-Cares Please fix the next firmware.