USB-C Power Delivery charging issues with Dell U3818DW monitors

hm did you try this?

Disable sleep on the MacBook. Go to System Preferences > Energy Saver > Prevent monitor from sleeping automatically when the display is off.

It seems it worked here https://twitter.com/mraible/status/1246484066360119298

Hey there,

I just read through this thread and I think this issue has been solved with the latest firmware update for the Dell U3818DW monitor, which I just purchased.

There's a new option in the monitors menu now which says:

USB-C Charging : On During Power Off

I was reading through the user manual here:

https://www.bhphotovideo.com/lit_files/350153.pdf

but didn't find the description of this feature anywhere, because it was probably added by the firmware update which can be found here:

https://www.dell.com/support/home/en-is/drivers/driversdetails?driverid=ctf4v&oscode=wt32a&productcode=dell-u3818dw-monitor

I'm having zero problems with this monitor, but I do NOT have an apple computer ( and I know this post is about Macbook Pro machine ) but I just wanted to point this out. I have a Lenovo Thinkpad T490 machine (https://www.lenovo.com/us/en/laptops/thinkpad/thinkpad-t-series/T490/p/22TP2TT4900) and am using it connected through the USB-C cable which came with the monitor and using the KVM switch for this keyboard:

https://www.logitech.com/en-us/product/k860-split-ergonomic-keyboard

and this mouse

https://www.amazon.com/Logitech-Spectrum-Shifting-Personalized-Programmable/dp/B019OB663A

and the laptop wakes up and sleeps properly, using Windows 10.

Just wanted to comment about this, this firmware update was probably created to tackle stuff like being talked about in this thread

It seems it might be fixed on macOS 10.15.5

https://www.dell.com/support/article/en-us/sln318549/power-chime-noise-from-macbook-when-charging-via-usb-c-on-u3419w-or-u3818dw-monitors-while-the-macbook-is-in-sleep-mode?lang=en

Have you tried it?

I'm considering buying this monitor, but this issue is pushing me back. The HP Z38c seems to be a strong alternative, but the 65W power output also pushes me back.

I'm not experiencing this issue on macOS 10.15.5 / MacBook Pro (16-inch, 2019) with U3818DW. But I did configure "Prevent monitor from sleeping automatically when the display is off." as suggested here https://www.dell.com/support/article/en-us/sln318549/power-chime-noise-from-macbook-when-charging-via-usb-c-on-u3419w-or-u3818dw-monitors-while-the-macbook-is-in-sleep-mode?lang=en.

Sorry to hear that nvlashi. Then what does this firmware update do?

• I was hoping it would fix this problem you're having?

USB-C charging function when DC is off mode

https://www.dell.com/support/home/en-is/drivers/driversdetails?driverid=ctf4v&oscode=wt32a&productcode=dell-u3818dw-monitor

I'm in the same boat .. 16" MBP and in the market for this Dell. But as i read all the forum i should avoid it. But .. there is no good alternative? The lg-38wn95c is still not available. And for my work i would need a monitor in a few days. So i can't wait for another 1-2 months. Any advice?

Yeah, after researching Dell, Benq, LG, Samsung, today I just went with two 24” LG Ultrafine 4k monitors (as sold by Apple). Not an exciting purchase, but compatibility issues and error messages would really ruin the Dell widescreen experience for me.

So how does this work? is the CalDigit powered by the Dell .. and the CalDigit powers the Macbook again?

will any dockingstation do? as long as it's 100w in and out. Cause i don't need the extra ports.

This issue is only occurs in sleep mode right? Because i bought this monitor anyway (build march 2020) and using it with a macbook 16" and i don't see any issue with sleep mode.

When i put it into sleep mode:

• mac sleeps
• Monitor : Scanning for Signal
• Monitor: No Signal for USB-C
• Monitor: Going into Power Save Mode

And both the laptop and monitor stay off .. i'm a missing something? What do i need to do to force this bug in the hardware of the dell

I have the 16 inch mbp and worked fine with the 3818 for a while.. now since 1 week, I first had flickering issues and now it is dropping connections all the time.. went from bad to worse.. I cannnot understand that either apple of Dell cannot have a fix for this.. bloody expensive setup and does not work now

The exact wording in the on screen menus ("OSD") of the Dell U3818DW is: USB-C Charging {On During Power Off|Off During Power Off} and the meaning should be self explanatory. If one is connecting an Apple MacBook Pro (I have a Late 2016 15 inch model) by single cable video and power USB-C to USB-C one needs the option on. M3B106 doesn't solve the chime sound and display going in and out of sleep. Physically turning the monitor off at its power button isn't ideal because it disconnects it from the MacBook causing windows to move around if one is using the MacBook open for dual screen and access to the fingerprint reader for example.

Is it referring to Power on/off of the monitor itself?

I never ever turn my monitor off by actually pushing the on/off button ... so basically this setting doesn't make any difference to me I guess?

It's always charging my laptop through the usb-c, because I never turn the monitor completely off ... or does it stop charging when the *monitor* itself it goes to sleep mode when there's no signal from any of the connected devices?