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2 Click OK or Apply to save the changes.
Ratiometric Expansion
Your RADEON card offers ratiometric expansion (or
digital panel scaling as it is commonly known). This
expands a low resolution image to fill a higher
resolution panel. However, ratiometric expansion is
only available on the Primary display. Therefore, if
a flat panel display (FPD) is set as Secondary, the
Extended Desktop mode is disabled and the
resolution is less than the FPD’s native resolution.
This causes the FPD to default to center mode.