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RE: P2815Q, U2412M, Surface Pro 3 + Dock. Flickering U2412M

I doubt that the monitor is defective. Agree, sounds like a sync issue. Set the SP3 Power Management to High Performance. Read this. I wonder if the flicker is part of this issue? Sleep and redock both mean the sync has to happen.

"On waking from sleep, Surface sometimes has an issue reconnecting to an external display. To fix it, unplug and re-plug the monitor connector back into the MiniDisplay port. This issue can also affect multiple daisy-chained monitors."



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