Jetson/Jetson TK1 Power

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Revision as of 20:22, 6 June 2014 by Shervin.emami (talk | contribs) (Limiting power use: Rephrased the warning note.)
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Limiting power use

Note: Debugfs and non-upstream sysfs nodes aren't guaranteed to remain unchanged in future releases.

Reducing power if display isn't required

As root:

echo -1 > /sys/kernel/debug/tegra_hdmi/hotplug
echo 4 > /sys/class/graphics/fb0/blank

Restricting to low-power core only

Restricting the CPU to the low power companion core can significantly reduce peak power (if running on a power-limited battery pack, for example), though at lower performance. As root:

echo 0 > /sys/devices/system/cpu/cpuquiet/tegra_cpuquiet/enable
echo LP > /sys/kernel/cluster/active

Powering with a battery

Compatible plug

Slightly under-powered step-up converter

More powerful step-up converter

Both of these step-up converters will work either from a USB battery or directly off a LiPo battery. Note that most USB batteries can only produce 5V@2.1A ~= 10W at best, which is less than the TK1 draws at max power consumption.