andre_debian@... wrote: > My kernel version (Jessie) is 3.2.0-4-686-pae, > and I don't observe a good energy usage > of the battery, always very lower compared > to Windows and my desktop is recent (april 2015). > > Andr� There are many things I do manually as I have not found a way to do it via gui or so. CPU frequency GPU frequency Wireless power disks power display basically everything that consumes power and this power consumption can be reduced. I have done this on 2 notebooks and 1 pc. Non of them was configured properly after installation. I am not using windows on the recent notebook, so I don't know how long it lasts, but with wireless on with 10db power and display turned on most of the time (75%) it was holding for 5h. (Dell Latitude e5440) kernel was 4.1.6 last time I was on the road example i915.i915_enable_rc6=1 acpi_backlight=vendor in command line https://wiki.ubuntu.com/Kernel/PowerManagement/PowerSavingTweaks regards