[ltp] battery is gone?

[Pascal Wittmann]

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On 10/12/2011 11:40 AM, Arno Trautmann wrote:
> Hi all,
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> 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
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> cat: /proc/acpi/battery/BAT0/state
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> to get information about the battery state. Also, powertop showed me an=

> acpi power usage estimate.
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> 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.
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> So =E2=80=A6 what's going on here and how can I restore the previous be=
haviour?
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> 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
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> on a X61s.
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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)


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