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How can I use ADB to get the refresh rate of a device's screen?

For context: I'm working on a python script that is going to display how many dropped frames occurred while it was measuring. In order to calculate that, I need to know the expected refresh rate of the device's screen.

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You can get the refresh rate through this command:

adb shell dumpsys display | grep -i mphys | cut -d ',' -f 2

Note that dumpsys display mentions refresh rate at other places too.

Derived from chr0m4k3y's answer on Stack Overflow.

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