/sys/class/power_supply/BAT0/ charge_ vs energy_

/sys/class/power_supply/BAT0/ charge_ vs energy_

[Jamie Kitson]

Hi,

I have an issue with my Arch installation on an X220 laptop.

Linux jamie-laptop 3.1.5-1-ARCH #1 SMP PREEMPT Sat Dec 10 14:43:09 CET
2011 x86_64 Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel
GNU/Linux

If I boot with AC plugged in the /sys/class/power_supply/BAT0/
directory is populated with charge_*, but if I boot on battery the
directory is populated with energy_*.

Disconnecting/connecting the power after boot does not effect the file names.

Is this a bug or a feature? It makes scripts harder to write than necessary.

Thanks, Jamie

/sys/class/power_supply/BAT0/ charge_ vs energy_

[Jamie Kitson]

Hi,

I have an issue with my Arch installation on an X220 laptop.

Linux jamie-laptop 3.1.5-1-ARCH #1 SMP PREEMPT Sat Dec 10 14:43:09 CET
2011 x86_64 Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz GenuineIntel
GNU/Linux

If I boot with AC plugged in the /sys/class/power_supply/BAT0/
directory is populated with charge_*, but if I boot on battery the
directory is populated with energy_*.

Disconnecting/connecting the power after boot does not effect the file names.

Is this a bug or a feature? It makes scripts harder to write than necessary.

Thanks, Jamie

ps, I really think
http://www.lesswatts.org/projects/acpi/mailing-lists.php needs
updating.

Re: /sys/class/power_supply/BAT0/ charge_ vs energy_

[Matthew Garrett]

On Mon, Jan 09, 2012 at 12:10:00PM +0000, Jamie Kitson wrote:

> If I boot with AC plugged in the /sys/class/power_supply/BAT0/
> directory is populated with charge_*, but if I boot on battery the
> directory is populated with energy_*.
> 
> Disconnecting/connecting the power after boot does not effect the file names.
> 
> Is this a bug or a feature? It makes scripts harder to write than necessary.

It's the way Lenovo's firmware works. It's not clear why.

-- 
Matthew Garrett | mjg59@srcf.ucam.org

Re: /sys/class/power_supply/BAT0/ charge_ vs energy_

[Jamie Kitson]

Thanks for your reply. Is this something that is likely to be fixed?

On 9 January 2012 13:37, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> On Mon, Jan 09, 2012 at 12:10:00PM +0000, Jamie Kitson wrote:
>
>> If I boot with AC plugged in the /sys/class/power_supply/BAT0/
>> directory is populated with charge_*, but if I boot on battery the
>> directory is populated with energy_*.
>>
>> Disconnecting/connecting the power after boot does not effect the file names.
>>
>> Is this a bug or a feature? It makes scripts harder to write than necessary.
>
> It's the way Lenovo's firmware works. It's not clear why.
>
> --
> Matthew Garrett | mjg59@srcf.ucam.org

Re: /sys/class/power_supply/BAT0/ charge_ vs energy_

[Matthew Garrett]

On Mon, Jan 09, 2012 at 09:36:34PM +0000, Jamie Kitson wrote:
> Thanks for your reply. Is this something that is likely to be fixed?

You'd have to ask Lenovo. We report the statistics that the firmware 
gives us.

-- 
Matthew Garrett | mjg59@srcf.ucam.org

Re: /sys/class/power_supply/BAT0/ charge_ vs energy_

[Jamie Kitson]

Could we not have a new generic file (or two) in the directory to
state battery level as a percentage, and perhaps another for warning
level as a percentage?

On 9 January 2012 21:39, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> On Mon, Jan 09, 2012 at 09:36:34PM +0000, Jamie Kitson wrote:
>> Thanks for your reply. Is this something that is likely to be fixed?
>
> You'd have to ask Lenovo. We report the statistics that the firmware
> gives us.
>
> --
> Matthew Garrett | mjg59@srcf.ucam.org

Re: /sys/class/power_supply/BAT0/charge_ vs energy_

[Yoshi Rokuko]

Jamie Kitson <jamie <at> kitten-x.com> writes:

> 
> Could we not have a new generic file (or two) in the directory to
> state battery level as a percentage, and perhaps another for warning
> level as a percentage?

that would be great indead! actually the first would suffice I think.
but this change of charge to energy and back is really a pain ...