new powermanager and battery

Sebastian Kügler sebas at
Wed Aug 30 14:12:24 BST 2006

As you might have noticed, development of the new powermanagement tool is 
going quite well.

There are two issues, however, I'm currently running into:

* I do not own a second battery for the Ultrabay of my notebook, so I cannot 
  implement support for this unfortunately. If someone wants to help out, I 
  can assist with the code. If someone wants to send me a battery for the 
  Ultrabay, that welcome of course, too. :-)

* HAL supports two levels of 'batterypower is low', one's called 
  battery.charge_level.warning, the other one is battery.charge_level.low.
  From my measurements, the "warning" level is reached when 10 minutes of 
  battery life is left, "low" is reached when the lights will go out in less 
  than about half a minute. My configuration would hibernate at low level, but 
  it might not come that far due to measurement skew, or die while 
  hibernating. Therefore I'm pondering to not use the HAL provided values 
  here, but have the user set those values up. There, we're running into 
  another problem, of course. Using a treshold value of N minutes can be 
  inaccurate due to power consumption changing over time. Using HAL's   
  battery.charge_level.rate interpolates that a bit. Using a treshold of N mWh 
  is nice for geeks, but has little value to those that are not arithmetic 
  geniuses and know how much their hardware drains now and in the next 

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