On Sun, 13 May 2018, Ognjen Galic wrote: > +Battery force discharging > +-------------------------- > + > +There is also support for AC overriding. This means that you can force the > battery to discharge > +even when AC is attached. This is also exposed via the generic ACPI driver: > + > +/sys/class/power_supply/BATx/force_discharge [int, 1, 0] > + > +Setting it to 1 forces the battery to discharge on AC.
This is used to run a battery "fuel gauge" callibration cycle. One has to set the limits to 0,100 (i.e. disable the anti-wear limiters), trigger a force_discharge, and wait until it discharges to zero. At that point, the EC is supposed to reset the force_discharge bit by itself, and then you have to wait the battery to charge back to full. (and at least on older thinkpads, where you had to use SMAPI to do the above, it didn't need much help from the operating system. Once a couple years you could just set force_discharge on both batteries (with the thing connected to AC), shutdown the operating system, and go to sleep. By morning, it would be fully charged and both gauges calibrated, still powered off, ready to go :P ). -- Henrique Holschuh ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
