Yubico Forum

Power consumption
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Author:  belette [ Wed May 18, 2016 7:27 pm ]
Post subject:  Power consumption


I am very surprise to see this... (my Nano consuming 8W! on a total of 10).
I guess I have an issue and would like to compare with you guys your powertop to see if there is any tunning to do to reduce it (it is consuming more than my 2K backlight!)
Many thanks

The battery reports a discharge rate of 10.3 W
System baseline power is estimated at 10.8 W

Power est. Usage Device name
8.77 W 100.0% USB device: Yubico Yubikey II (Yubico)
1.29 W 59.6% Display backlight
625 mW 4.4% DRAM
106 mW 4.4% CPU core
21.7 mW 4.4% CPU misc
8.41 mW 6.4 ops/s GPU core

Author:  Jakob [ Wed Jun 01, 2016 2:16 am ]
Post subject:  Re: Power consumption

The nominal power consumption of a Yubikey 2 is about 10mA at 5V, so this should be about 0.05W. If the power consumed in the Nano would in fact have been 8W, it would have been on fire for sure.

If the readings are correct, I guess this rather has to do with the power management in the computer. With a USB device attached, it may not be as aggressive in shutting down and larger parts of the USB subsystem may be enabled. Just a speculation.

However - 8W for the device itself is completely out of question, unless you see a plume of smoke coming out there.

Best regards,


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