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What's DOS?
Posts: 3
Registered: ‎08-18-2009
Location: USA
Views: 131
Message 1 of 1

T420 Dual Display Temp Switch to Single Display then Back

T420, no docking station, with external monitor connected to VGA port. Windows 8.1 64-bit. Display driver up-to-date, Windows 8.1 up-to-date. Lenovo Syetm Update run and everything is up-to-date.


So occasionally it switches back to single display (laptop screen) then immediately switches back to dual display. Seems to do this randonly without warning.


I don't see any obvious issues, event log does not show any problems when the issue occurs.


I did reinstall the display driver but that did not help.


This is more of an annoyance then anything else. I just stop what I am doing and wait for it to switch back to dual display, as I use the external monitor as my primary desktop.

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