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bastiklee / java-simple-serial-connector

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Hundreds of wakeups per second wastes lots of power on small host system even with idle port (no datat flow) #67

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
What steps will reproduce the problem?
1. Open USB FTDI connection, eg to Arduino.
2. Looks at wakeups per second; now >> 500 (compared to normal ~40 for me) even 
with no data flow and control lines steady.

What is the expected output? What do you see instead?

May as much as double power consumption of entire host system.

What version of the product are you using? On what operating system?

Mac OS X, but also want to use with SheevaPlug or other small low-power system.

Please provide any additional information below.

Too many wakeups (and insufficient long/deep sleeps) wastes a lot of power, eg 
see powertop tool on Linux.

Original issue reported on code.google.com by d...@hd.org on 5 May 2014 at 2:00