El día Friday, January 20, 2017 a las 03:22:46AM -0700, Selene Scriven escribió:
> * Matthias Apitz <g...@unixarea.de> wrote:
> > What is the name of this process and does it have some log file
> > (maybe to avtivate) which would log the actual voltage and the
> > derived estimated percentage?
>
> There are entries for it in the kernel, but IIRC I think the UI
> probably uses upowerd. From what I recall, its log only has
> timestamps and percentages, but it has been a while since I
> checked.
I watched a while the upowerd with strace and it seems it reads the
voltage *and* capacity information from the kernel:
$ egrep 'open\(|read\(11' upowerd.tr | grep -v NOENT | grep -v '= 0'
open("/sys/devices/platform/battery/power_supply/battery/present",
O_RDONLY|O_LARGEFILE) = 11
read(11, "1\n", 4096) = 2
open("/sys/devices/platform/battery/power_supply/battery/voltage_max_design",
O_RDONLY|O_LARGEFILE) = 11
read(11, "4200000\n", 4096) = 8
open("/sys/devices/platform/battery/power_supply/battery/technology",
O_RDONLY|O_LARGEFILE) = 11
read(11, "Li-ion\n", 4096) = 7
open("/sys/devices/platform/battery/power_supply/battery/status",
O_RDONLY|O_LARGEFILE) = 11
read(11, "Discharging\n", 4096) = 12
open("/sys/devices/platform/battery/power_supply/battery/voltage_now",
O_RDONLY|O_LARGEFILE) = 11
read(11, "3735000\n", 4096) = 8
^^^^^^^^^^^^^^^^^^^^^^^^^^
open("/sys/devices/platform/battery/power_supply/battery/capacity",
O_RDONLY|O_LARGEFILE) = 11
read(11, "41\n", 4096) = 3
^^^^^^^^^^^^^^^^^^^^^^^^^^
open("/sys/devices/platform/battery/power_supply/battery/temp",
O_RDONLY|O_LARGEFILE) = 11
read(11, "240\n", 4096) = 4
having done this, it sends the assembled information to some connected client:
...
sendmsg(4, {msg_name(0)=NULL,
msg_iov(2)=[{"l\4\1\1p\2\0\0\6=\0\0\216\0\0\0\1\1o\0/\0\0\0/org/freedesktop/UPower/devices/battery_battery\0\2\1s\0\37\0\0\0org.freedesktop.DBus.Properties\0\3\1s\0\21\0\0\0PropertiesChanged\0\0\0\0\0\0\0\10\1g\0\10sa{sv}as\0\0\0",
160},
{"\35\0\0\0org.freedesktop.UPower.Device\0\0\0D\2\0\0\n\0\0\0Technology\0\1u\0\0\0\1\0\0\0\n\0\0\0EnergyFull\0\1d\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\v\0\0\0PowerSupply\0\1b\0\0\1\0\0\0\n\0\0\0HasHistory\0\1b\0\0\0\1\0\0\0\v\0\0\0TimeToEmpty\0\1x\0\0\0\0\0\0\0\0\0\0\0\0\0\0\5\0\0\0State\0\1u\0\0\0\0\2\0\0\0\0\0\0\0\16\0\0\0IsRechargeable\0\1b\0\0\0\1\0\0\0\0\0\0\0\6\0\0\0Vendor\0\1s\0\0\0\0\0\0\0\0\0\0\0"...,
624}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 784
i.e. the (Android-) kernel is providing the wrong capacity info.
matthias
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Matthias Apitz, ✉ g...@unixarea.de, ⌂ http://www.unixarea.de/ ☎
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