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U2722DE, U2722D daisy chain now not working, duplicate only
I am using the following monitor setup connected via the cables supplied with the monitors: PC Display Port output to U2722DE Display Port input, U2722DE Display Port output to U2722D Display Port input. I have also connected U2722DE USB-C upstream port to USB3 port on PC and sometimes connect a laptop to U2722DE USB-C Display Port. I am extending my desktop to the two monitors and sometimes I connect my laptop and extend to the two monitors (3 in total). KVM switching was setup correctly and works fine. A few days ago the monitor extension stopped working and Windows does not see U2722D monitor over the daisy chain through U2722DE both over Display Port and USB-C connections. If I connect the second monitor directly to another output on my PC I get extended display support as before, but not with daisy chain anymore. I have latest drivers installed for both monitors (D and DE) and latest firmware too. Latest driver for the graphics card is also installed. I tried restarting PC, laptop and monitors, reinstalling all drivers and firmware on both monitors, changing all cables, but nothing seems to help. I am out of ideas. I am looking for a suggestion I have somehow missed and haven't tried yet.
Chino de Oro
8 Wizard
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October 7th, 2024 13:58
Go through the monitor OSD menu and verify DP MST set to ON. Perform monitors reset if necessary.
Refer to monitor User Guide https://dl.dell.com/content/manual39176859-dell-u2722de-monitor-user-s-guide.pdf?language=en-us
ejn63
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October 7th, 2024 11:06
You've left out the system model, which is a critical piece of information for anyone formulating a suggested answer.
Penoff
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October 8th, 2024 08:17
@ejn63 system is Windows. Both laptop and PC work with Win10. One has Intel UHD630 integrated graphics card and the other has some newer integrated graphics again on Intel CPU. Both are HP (elitedesk and elitebook, but I haven't checked exact models).
@Chino de Oro a couple of hours after posting I found this settings and it seemed to work. No idea if it was enabled before and got disabled somehow on its own.