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Google Pixel 4’s 90Hz display only works at high brightnesses (by Tushar Mehta) https://ift.tt/32AIqaW
XDA Developers
[Update 2: Fix Rolling Out] Google Pixel 4’s 90Hz display only works at high brightnesses
The smooth display on the Google Pixel 4 and Pixel 4 XL reverts back from 90Hz refresh rate to 60Hz automatically when the brightness is at or below 75%.