I don't know what the equivalent is on Windows, or if you can even read/write the settings without using Catalyst. There is a way to directly tweak the underscan/overscan on Linux by modifying values in the "PCSDB" (Persistent Configuration Store Database). It also seems to be a fairly unique decision among graphics driver developers, as I can't reproduce the weirdness on a number of other non-AMD devices: Android tablets, Nvidia cards, and Intel on-chip graphics. I don't agree with the policy, but that's the way it is. So they are sticking to their guns on underscanning by default on HDMI to ensure that nobody gets stuck with a desktop that's too big for their screen (with UI elements hanging "off the screen"). ![]() The argument is that if the desktop is too large, then the user can't see where the Catalyst icon is or the start menu, and they therefore can't navigate the UI in order to make the appropriate change. The basic idea is that AMD would rather underscan some people whose HDMI displays don't overscan, and create too small of a picture (blank spaces around the picture), rather than not underscan and cause people whose displays always overscan (with no setting to change it and incorrect EDID information) to have the desktop display too large. ![]() I've had extensive discussion about the overscan/underscan dilemma with AMD developers who work on the Catalyst drivers.
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