PowerTOP Still Worthwhile For Extending Linux Battery Life In 2018
Written by Michael Larabel in Computers on 26 July 2018. Page 3 of 3. 14 Comments

During a 7-Zip compression benchmark, the X1 Carbon continued seeing about a half-Watt savings on average even under this load while the peak power draw was lower by about one Watt. The ASUS UX301LAA saw less savings and here the average power use was actually slightly higher while the minimum power draw achieved was lower by about 300 Milliwatts.

When running some basic OpenGL graphics tests on these Intel HD Graphics, the performance was about the same while the X1 Carbon saw about 300 Milliwatts lower power use on average and about a half-Watt savings in the peak power use. The ASUS UX301LAA saw about a 700 Milliwatt power-savings on the bottom end.

The ASUS UX301LAA Haswell laptop didn't see much of a change with its battery power consumption when under load, but during the idling periods it did see a measurable improvement. For the newer Lenovo ThinkPad X1 Carbon, its battery power usage dropped thanks to PowerTOP both during the idling phase as well as under many of the benchmarks executed. PowerTOP remains an easy way for Linux laptop users to tweak their system's power profile for trying to squeeze out slightly better power savings, assuming you don't have a particularly problematic system where some power tunables could cause adverse stability or issues when for example on suspend/resume.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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