VIEWSONIC XG2560 25" 16:9 LCD Gaming Monitor - Manual (Page 21)

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To ensure auto-detection is successful, go to ‘Advanced Display
Settings’ under your system ‘Display Settings’ (screen resolution)
window. There you can verify your ViewSonic monitor has been
recognized by your PC in the ‘Color Management’ section of your
advanced settings.
XG2560 SERIES (default) XG2560 SERIES
If your PC has not auto-detected the monitor, but is still functioning,
you can download the driver from ViewSonic website and install it
then restart.your computer and follow the steps above again. It is
not imperative for your computer to detect the monitor for normal
use, but it is recommended.
If you encounter additional problems or have questions, please
contact Customer Support.