Re: [gpm] Unexpectedly low battery life

["simon zheng sun com" <Simon Zheng Sun COM>]

Steve,

Low-level HAL supplies two properties.

1. battery.charge_level.last_full (int)  

The maximum level of charge the device could hold the last time it was
full. Measured in "battery.charge_level.unit" units.

2. battery.reporting.design (int)  

The maximum level of charge the device was designed for, as reported by
the hardware. Measured in "battery.reporting.unit" units. 

In GPM, 
capacity = battery.charge_level.last_full/battery.reporting.design.

So lower capacity means your poorer battery performance. Value is
decided by battery hardware itself. I think this info is very useful.

-Simon


On Thu, 2008-05-15 at 22:44 +0100, Stephen Brandwood wrote:
> Hi,
> 
> I've noticed a large drop in battery life performance since I switched
> from Ubuntu 7.10 to a fresh install of Ubuntu 8.04 (both 32 bit and 64
> bit versions). The Power Manager tool has highlighted a massive problem
> with the battery capacity being capped at 59% (full stats are below). 
> 
> How is this number calculated? Is it possible something deep inside the
> OS is misreading the charge of my battery? The loss of capacity somewhat
> correlates with the drop in performance I have observed.
> 
> Thanks,
> Steve
>  
> Battery details after a full charge:
> Product: DELLUD2606
> Percentage Charge: 99%
> Vendor: Sanyo
> Technology: Lithium ion
> Model: DELLUD2606
> Capacity: 59% (Poor)
> Current Charge: 56.8 Wh
> Last full charge: 56.8 Wh
> Design charge: 95.5 Wh
> Charge rate: 33.0 W
> 
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