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Just updated a few days ago and I can't get the second monitor to work properly. It just mirrors the laptop screen with the same dimensions & resolution. Going into System Settings > Displays doesn't show the external screen. Nothing turns up in Additional Drivers.

When I turn on the laptop with the monitor already connected, the monitor displays the boot options with the correct dimensions/resolution; it's only later at the login screen that it stops displaying correctly.

Thanks in advance for your help.

Edit: My touchpad click & two finger scroll don't work on some boots, this is also new with the update. Could these problems suggest a driver issue?

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  • Are you daisy-chaining the monitors through a display port connection. If so you may need to change some settings in your monitors themselves.
    – SunnyDaze
    Aug 23, 2017 at 22:24

1 Answer 1

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Is there a Mirror displays check-box under System Setting->Displays?

If there is, un-check it, and the second monitor should appear in the Displays window.

enter image description here

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  • The option is unchecked and greyed out as in your screenshot.
    – Slippy_K
    Aug 9, 2017 at 12:37

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