Second monitor showing as "No Monitor" after Sequoia 15.4.1 (24E263)
 

Second monitor showing as "No Monitor" after Sequoia 15.4.1 (24E263) - screenshot attached.

any ideas?

Hello paulosoaresf,

Could you share more information about the setup you have?

Please make sure that you have the latest version of DisplayLink Manager app installed.
You should also check if your second monitor is properly connected and if all the cables are working well.

I am having the same issue with my Mobile Pixels Duex Lite monitor. Worked just fine until I upgraded to Sequoia. I contacted Mobile Pixels support (NOT an easy thing to do) and they are trying to convince me it's the cable.

Hello pam@paragraphwriting.com,

Please ensure that you have the latest driver installed.
If your problem still occurs, please contact us here.

After updating to Sequoia 15.4.1 (24E263), my second monitor stopped working and now shows up as "No Monitor" under display settings. It was functioning perfectly before the update, so I’m fairly certain this is a compatibility or driver issue introduced in this version.

I’ve tried the usual fixes: unplugging and replugging the monitor, switching cables, restarting the system, and even resetting NVRAM/PRAM. Nothing seems to restore the second display. It’s incredibly frustrating, especially for those of us who rely on dual-monitor setups for work.

Hello Macron,

Have you tried using End-User Cleaner Tool and reinstalling the driver?
Here is more about how to install it.