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We reviewed the smaller model, and for $65, it wasn't a bad device at all. Hopefully Dell also sees this and figures out why or updates the app the show the "Enable display Matrix" always.ĭell P2419HC Dell Display Manager User’s GuideWalmart released two tablets under its 'Onn' tech brand last year, the Onn 8 and Onn 10. Found this totally by chance because I had the HDMI connected for the display and I was still using the USBC from the monitor to my laptop because the keyboard is connected to the monitor and then via the usbc to the laptop because when it was working I just had a single usbc cable to connect to my laptop for both display and keyboard. I connected both display outputs on the laptop to the same monitor which fooled "Display Manager" into thinking I had 3 displays, the laptop display a USBC display and an HDMI display. I've tested it and this option only appears on the "Basic" tab if "Dell Display Manager" thinks that there is more than one external monitor. NOTE: My USBC was connected as well as the HDMI on the laptop at the time. On the Basic Tab, right at the bottom mine showed a tick box that said something like "Enable display matrix control" It will display the summarized version, At the bottom click on "Open Dell Display Manager" Right click on desktop and Open "Dell Display Manager" (install it if you don't already have it) Today while I got it to work though so I wanted to share my solution that I found by chance:Ĭonnect another display OR two of the Monitor inputs eg, the USBC and the HDMI. I tried searching the net but didn't find a solution and opted to use the HDMI port which worked, I also tested the USBC with my iPad Pro which worked perfectly.

Hope it fixes your issue, I had this issue yesterday with my Dell Precision 5540 and Dell U3219Q monitor after a power outage where the display was previously working via the USB-C suddenly stopped.