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Minor issue: fpslave CPU usage on lockscreen

asked 2019-08-11 08:07:41 +0300

mia
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On Xperia X: Wake up the device by pressing the power button, then don’t let go of the fingerprint reader. This results in fpslave continuously using close to 100% CPU time until the device returns to sleep or the finger is removed from the reader.

I think this could be more efficient. Is fpslave “polling” at a high frequency?

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answered 2019-08-12 09:53:44 +0300

spiiroin
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Well, at least in theory fpslave just initiates authentication and then waits notifications from android hal i.e. no polling at sfos sw level. Judging by logcat android fp hal in Xperia X is constantly doing something (and logging it too). Since hal is accessed via dynamic libraries/plugins, this activity gets attributed to fpslave process.

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Asked: 2019-08-11 08:07:41 +0300

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Last updated: Aug 12 '19

Minor issue: fpslave CPU usage on lockscreen

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