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28826
July 24th, 2019 01:00
U3419W, MacBook, USB Type-C, sleep/wake issues
I recently got a u3419w. I connected my keyboard and mouse to the usb hub and switch inputs between my PC on DP and the Macbook on usb-c. When I am using the PC with the Mac connected, it eventually goes to sleep and despite being on the DP input, a "usb-c input disconnected" message appears. Mildly annoying but no big deal. However this apparently is enough to trigger a wake on the Macbook and a few seconds later I get a "usb-c connected" message. After a minute or two the Mac goes back to sleep and the cycle continues. As you can imagine, this becomes extremely annoying and I am forced to disconnect the Mac and stop it charging. There seems to be a number of posts around about similar issues with similar Dell monitors, although no one seems to mention that they see these annoying status messages for one input while using another. Any advice on how to fix this issue? Thanks
noafe
1 Message
0
December 2nd, 2019 12:00
I've found a solution for this, originally pointed out on the Apple forums.
The key is to go to Energy Saver preferences for the Power Adapter, disable Power Nap, and enable "Prevent computer from sleeping automatically...". This seemed to do the trick for me, no more power connected sound coming from my MacBook Pro except when I actually connect the computer to power.
zelyanovskyymdear
2 Posts
4
December 25th, 2019 19:00
That didn't work for me.
I've tried different combinations of the options:
No combination works for me - MacBook Pro (15-inch, 2017) wakes up right after I turn it off.
So there are three threads discussing the same issue now:
https://www.dell.com/community/forums/replypage/board-id/Monitors-Forum-f3529/message-id/122971
https://www.dell.com/community/Monitors/U3419W-scanning-for-signal-when-Apple-is-asleep/td-p/7254570
https://discussions.apple.com/thread/250477993?answerId=251481545022#251481545022
Any word from Dell? Should be a fix in the Monitor firmware.
3818owner
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6 Posts
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January 17th, 2020 11:00
The U3818DW running firmware M3B106 has a defect in the USB-C PD protocol that violates spec and causes similar sleep wake issues. This may be the same issue given M3B106 is the also the latest firmware for the U3419W and the symptoms are similar. See https://www.dell.com/community/Monitors/U3818DW-USB-Type-C-power-delivery-problem/td-p/7452974
If the U3419W is violating USB-C spec like the U3818DW is, it has nothing to do with Mac vs. PC and is a USB-C bug Dell needs to fix as they're advertising the monitor as supporting USB-C.