Article ID : S500016624 / Last Modified : 11/04/2018

Why does the screen resolution change to 640 x 480 when the dual display setting is enabled and the primary monitor is changed?

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The resolution changes to 640 x 480 when the dual display setting is enabled and the primary monitor settings are changed.

If the primary monitor changes when the dual display setting is enabled, the resolution will become 640 x 480.

Therefore, to change the primary monitor, please cancel the dual display setting first.
This will show the display to be used as a primary monitor with the Fn + F7 keys.