[ltp] Re: battery is gone?

[Claudius Hubig]

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Pascal Wittmann <PascalWittmann@gmx.net> wrote:
>On 10/12/2011 11:40 AM, Arno Trautmann wrote:
>> Hi all,
>>=20
>> again I have in interesting behaviour of my machine: It doesn't consume
>> any power!
>> At least if I beleave what it tells me: A few days ago, I could use
>>=20
>> cat: /proc/acpi/battery/BAT0/state
>>=20
>> to get information about the battery state. Also, powertop showed me an
>> acpi power usage estimate.
>>=20
>> Now, the file is just gone and I don't get any estimate. The machine
>> kind of claims there is no battery, but it runs fine without AC
>> connection. I can only notice that the battery is running low by the
>> orange LED instead of the green one.
>>=20
>> So =E2=80=A6 what's going on here and how can I restore the previous beh=
aviour?
>>=20
>> 3.0-ARCH #1 SMP PREEMPT Fri Oct 7 11:35:34 CEST 2011 x86_64 Intel(R)
>> Core(TM)2 Duo CPU L7500 @ 1.60GHz GenuineIntel GNU/Linux
>>=20
>> on a X61s.
>>=20
>
>I noticed the same behavior on a T61 with Archlinux, too. Maybe this is
>caused by a kernel update.
>
>In the meantime you can use:
>
>	/sys/class/power_supply/BAT0/
>
>there is no direct state, but you can calculate it something like that:
>
>	cd /sys/class/power_supply/BAT0/
>	current=3D$(cat energy_now)
>	full=3D$(cat energy_full)
>	echo $(echo "$current / $full" | bc -l)

In addition to that, you can get more details with tp-smapi (m-a a-i
tp-smapi on Debian) which presents the /sys/devices/platform/smapi/-
Interface when loaded, which contains, apart from others, the file
remaining_percent.

However, I wonder why powertop still appears to rely on the =E2=80=93 as far
as I can tell =E2=80=93 deprecated /proc/acpi instead of
using /sys/class/power_supply.

Best regards,

Claudius
--=20
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