I'm having this same problem with my Inspiron 7591 2-in-1 Black Edition. Obviously there has been some big bug in the BIOS for 9570 for quite some time already, and Dell is still not solving this problem. The solution (according to that post) is to go down to some really old BIOS version. This has been an issue for already quite some time, and there are few more posts about it. It doesn't happen if the external monitor is the only monitor (internal display is off), and it only happens when both displays are 4k, not when one of them is set to a lower resolution. It usually happens when after the boot or wake up from sleep/hibernate, but it can also happen when some apps are launched. That's not the whole problem because after that it often happens that some devices like audio don't work at all until the laptop is restarted.
The external display flickers and then goes gray for a minute, while the whole laptop is almost frozen, with System process consuming almost 100% of CPU. 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 GuideIs your external monitor 4k? I have the same issue with my external 4k monitor when the internal display on my 9570 is on as well. 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.
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