incorrect battery design capacity

incorrect battery design capacity

[Jachym Cepicky]

Hi, 
if I'm in wrong mailing list, my apologizes, plese point me to the right
one.
 
It is truth, that my laptop is about 3 years old, and so, I can not
expect  miracles from my battery, however, I would call this an bug:

I have HP Compaq nx6125 and on the battery it is written, that it is
10.8V - 4.8 Ahr, which I understand, that capacity of my battery is 4800
mAh. 

However,  cat /proc/acpi/battery/C179/info 
present:                 yes
design capacity:         638 mAh
last full capacity:      638 mAh
battery technology:      rechargeable
design voltage:          11100 mV
design capacity warning: 32 mAh
design capacity low:     7 mAh
capacity granularity 1:  100 mAh
capacity granularity 2:  100 mAh
model number:            Primary
serial number:           03740 2006/01/12
battery type:            LIon
OEM info:                Hewlett-Packard

The last full/design capacity ratio is (after 3 years) impressive. But I
would expect the design capacity little bit (about 7.5x?) higher. 

Is it the bug of acpi? Kernel? Do I have to buy me a new battery?  Can I
set somehow design capacity by hand?

Linux kocour 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686
GNU/Linux
Ubuntu 8.10
acpi 1.1

Thanks

Jachym
-- 
Jachym Cepicky
e-mail: jachym.cepicky gmail com
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/pgp/JachymCepicky.pgp

Re: incorrect battery design capacity

[yakui_zhao]

On Mon, 2009-02-23 at 16:18 +0800, Jachym Cepicky wrote:
> Hi, 
> if I'm in wrong mailing list, my apologizes, plese point me to the right
> one.
>  
> It is truth, that my laptop is about 3 years old, and so, I can not
> expect  miracles from my battery, however, I would call this an bug:
> 
> I have HP Compaq nx6125 and on the battery it is written, that it is
> 10.8V - 4.8 Ahr, which I understand, that capacity of my battery is 4800
> mAh. 
> 
> However,  cat /proc/acpi/battery/C179/info 
> present:                 yes
> design capacity:         638 mAh
It seems that the design capacity is not very correct.
Will you please try the latest kernel and see whether the battery design
capacity can be reported correctly?
Of course please also attach the output of acpidump.
Thanks.
> last full capacity:      638 mAh
> battery technology:      rechargeable
> design voltage:          11100 mV
> design capacity warning: 32 mAh
> design capacity low:     7 mAh
> capacity granularity 1:  100 mAh
> capacity granularity 2:  100 mAh
> model number:            Primary
> serial number:           03740 2006/01/12
> battery type:            LIon
> OEM info:                Hewlett-Packard
> 
> The last full/design capacity ratio is (after 3 years) impressive. But I
> would expect the design capacity little bit (about 7.5x?) higher. 
> 
> Is it the bug of acpi? Kernel? Do I have to buy me a new battery?  Can I
> set somehow design capacity by hand?
> 
> Linux kocour 2.6.27-11-generic #1 SMP Thu Jan 29 19:24:39 UTC 2009 i686
> GNU/Linux
> Ubuntu 8.10
> acpi 1.1
> 
> Thanks
> 
> Jachym

Re: incorrect battery design capacity

[Jachym Cepicky]

Hi,
yakui_zhao píše v Po 23. 02. 2009 v 16:58 +0800:
> On Mon, 2009-02-23 at 16:18 +0800, Jachym Cepicky wrote:
> > Hi, 
> > if I'm in wrong mailing list, my apologizes, plese point me to the right
> > one.
> >  
> > It is truth, that my laptop is about 3 years old, and so, I can not
> > expect  miracles from my battery, however, I would call this an bug:
> > 
> > I have HP Compaq nx6125 and on the battery it is written, that it is
> > 10.8V - 4.8 Ahr, which I understand, that capacity of my battery is 4800
> > mAh. 
> > 
> > However,  cat /proc/acpi/battery/C179/info 
> > present:                 yes
> > design capacity:         638 mAh
> It seems that the design capacity is not very correct.
> Will you please try the latest kernel and see whether the battery design
> capacity can be reported correctly?
> Of course please also attach the output of acpidump.
> Thanks.

Sorry, I managed to compile (install) only current 2.6.28 version from
Ubuntu Jaunty (2.6.28.6, I guess) [1]. Compilation of linux-2.6.28.7
from kernel.org went fine, (fakeroot make-kpkg --initrd
--append-to-version=-custom kernel_image kernel_headers), but the
post-installation script did not work.

So, if it helps, I have 
Linux kocour 2.6.28-8-generic #24 SMP Mon Feb 23 15:29:17 CET 2009 i686
GNU/Linux, Ubuntu 8.10

cat /proc/acpi/battery/C179/info
present:                 yes
design capacity:         638 mAh
last full capacity:      638 mAh
battery technology:      rechargeable
design voltage:          11100 mV
design capacity warning: 32 mAh
design capacity low:     7 mAh
capacity granularity 1:  100 mAh
capacity granularity 2:  100 mAh
model number:            Primary
serial number:           03740 2006/01/12
battery type:            LIon
OEM info:                Hewlett-Packard

the output from acpidum can be found at [2], with --binary at [3]

I hope, it helps, thanks a lot

Jachym

[1] http://packages.ubuntu.com/jaunty/linux-image-2.6.28-8-generic
[2] http://les-ejk.cz/tmp/acpidump.txt
[3] http://les-ejk.cz/tmp/acpidump.bin
-- 
Jachym Cepicky
e-mail: jachym.cepicky gmail com
URL: http://les-ejk.cz
GPG: http://les-ejk.cz/pgp/JachymCepicky.pgp

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