Re: power management problems
On Fri, Sep 14, 2007 at 02:13:32AM +0530, Ritesh Raj Sarraf wrote:
> rrs@learner:~$ cat /proc/acpi/battery/BAT0/info
> present: yes
> design capacity: 4800 mAh
> last full capacity: 1003 mAh
> battery technology: rechargeable
> design voltage: 11100 mV
> design capacity warning: 480 mAh
> design capacity low: 145 mAh
> capacity granularity 1: 48 mAh
> capacity granularity 2: 48 mAh
> model number: DELL YF0806
> serial number: 2004
> battery type: LION
> OEM info: SMP
> > How long does your laptop actually run before the battery drops off?
> AFAIU, 5-10 minutes. I noticed is that when on battery, the battery monitor
> quickly starts draining from full to half. Once it is half, all of a sudden
> it goes to like 5% remaining and I get a warning. And then my machine tries
> to hibernate.
> If hibernate is disabled, it will wait for another minute and then just
> power off.
Your battery holds a charge of 1000 mAh, and sends a warning at 480 mAh.
That's consistent with changing to a warning mode at half power.
Maybe, in a fit of conservatism, the software that sends the warnings
calculates against the design charge?
My battery reports
design capacity: 6600 mAh
last full capacity: 2784 mAh
design capacity warning: 278 mAh
model number: DELL D0093
which seems more sensible. I'm running kernel 2.6.18-5-686. It may
be this is calculated onboard the battery; I don't know how to check.
At any rate, your battery is only holding 20% of its design charge.
Even if you fix this you may need a new battery soon. It might be
less headache just to buy one now.
Dept. of Physics & Astronomy
University of Tennessee phone: 865 207 2594
Knoxville, TN 37996 email: firstname.lastname@example.org