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I used AMD CCC (administrative) to disable underscanning, but after reboot it underscans again, so I have to move the slider again after every reboot.

I tryed CCC non-administrative, but still have the same problem.

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What worked for me is opening AMD CCC non-administrative and adjusting the over scan to 0, then reboot and it works. For some reason the admin side doesn't persist but non-admin does.

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