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November 7th, 2025 12:56
U4323QE, KVM/USB switching not working
I have two laptops connected to my monitor and I'm struggling to get the KVM/USB switching working. The main issue is when I try to switch via the OSD I get the message "USB Switch function is only available when pip pbp function is enabled" despite having PBP enabled and in use.
My Connections are:
MacBook -> USB-C1
Lenovo -> (DP1; DP2)+USB-C2
Thanks!
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encogneeto
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November 13th, 2025 15:06
Simply letting it sit over the weekend seemed to resolve the issue? It's working with the port replicator.
DELL-ChrisM2
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November 7th, 2025 13:39
Dell GHN (Get Help Now) chat technical support must verify the ownership and warranty status. Click the blue "Get Help Now" on the right to start a private live chat session. Share the private U4323QE Service Tag with them.
Using pages 11/12/50/53/58 in User's Guide. Check the settings and setup below and retest =
MacBook TB --> U4323QE 1.0 M USB-C to USB-C cable --> U4323QE #7 USB-C 1 upstream port
Lenovo DP --> U4323QE DP to DP cable --> U4323QE #5 DP in port
Lenovo USB-A --> U4323QE USB-A to USB-C cable --> U4323QE #9 USB-C 2 upstream port
U4323QE Menu --> Input Source --> Auto Select = Off
U4323QE Menu --> Display --> Dell Power Button Sync = Off
U4323QE Menu --> USB --> DP 1 assign to USB-C 2
encogneeto
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November 7th, 2025 14:07
@DELL-ChrisM2
Thanks for the quick reply.
There is actually a port replicator (Dell WD19) between the Lenovo and the U4323QE and I'm using a USB-C to USB-C cable for the WD19 to the monitor:
Lenovo TB --> Dell WD19 USB-C to USB-C cable --> U4323QE #9 USB-C 2 upstream port
Input Source is set to DP1; Auto Select and Auto Select for USB-C are greyed out
Display Dell Power Button Sync is greyed out
USB DP1 and PD2 are assigned to USB-C2
DELL-ChrisM2
Community Manager
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501 Posts
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November 7th, 2025 15:08
Please test without the port replicator and post the results.