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Nexus7 Power Measurement

Steve Conklin did an initial investigation on the power consumption on the Nexus7 by watching the I2C bus and doing some disassembly of the unit:

• Initial Nexus7 Power Investigation (ODP)

• git repo for tools mentioned in the above presentation: git@github.com:sconklin/nexus-tools.git

Identifying Issues

• Identifying Power Management Issues

• Measuring CPU usage is a good way to detect when your application is drawing too much power, kcachegrind and callgrind (part of Valgrind) are excellent tools.

Hardware Tools

The ARM Energy Probe is a hardware tool that is fairly cheap and can be used to measure power consumption. It uses a GPL software stack and offers command-line and HTML5+websockets interface. Here is an intro video on using the ARM Energy Probe.