On Mon, May 14, 2018 at 09:03:02AM -0300, Henrique de Moraes Holschuh wrote: > 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. That's the intended use case for this patches via an upcoming program I am writing for userspace. > > (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 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
