Prince of Persia: The Forgotten Sands Discussion
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HKEY_CURRENT_USER\Software\Ubisoft\Prince of Persia - The Forgotten Sands\1.0\Engine
You'll see screen res settings among other things which you might want to try altering, though as the game launcher didn't work for you (and it did for me), changing these directly might not do anything either. Could it be that a graphy driver update fixes it? Might want to check that.
(Also disables all game specific optimizations, advanced setting instead tries to be more aggressive and attempts to force Crossfire via alternate frame rendering mode.)
from Ubisoft's Forums
Open regedit, search for "AlternateVerticalSyncThreshold". Unless you have multiple Ubi games installed, it should immediately give you PoP's registry key. It should look something like Software->Ubisoft->Prince of Persia - The Forgotten Sands->1.000000000->Engine
Right-click the folder called 1.000000000 and rename it to 1.0.
Problem solved. Yeah, it's hilarious, I know. Way to go, Ubisoft.
Mine was named something like that, not sure on the exact number of zeros but renaming it to 1.0 completely solved the issue.
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