Difference between revisions of "Talk:Laptop"

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(Udev Rule to Suspend System)
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== 2.8 Suggestions for saving power ==
 
All of these are applied/can be applied by laptopmode. I added a little note about it, but it's not enough. Some of the values are different from those applied by the default laptopmode config.
 
Redundant/could create issues. [[User:UNIVAC|UNIVAC]] 23:00, 24 September 2009 (EDT)
 
 
 
==Other tweaks ==
 
==Other tweaks ==
 
No explanations with these tweaks? What do these do? Is linking to the source enough or should we describe what we're doing in detail? I'm never too comfortable with "do this" type instructions without a "this is why" explanations.--[[User:Multiphrenic|Multiphrenic]] 09:05, 27 April 2011 (EDT)
 
No explanations with these tweaks? What do these do? Is linking to the source enough or should we describe what we're doing in detail? I'm never too comfortable with "do this" type instructions without a "this is why" explanations.--[[User:Multiphrenic|Multiphrenic]] 09:05, 27 April 2011 (EDT)
  
==Suggestions for saving power ==
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==Udev Rule to Suspend System==
I'd add a a little script for turning off the wlan-Hardware when not connected at startup...if not turned off, the wlan-Hardware will go on searching for an AP to connect to, although there might be no potential AP at all, thus wasting power.
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The udev rule could be edited to run a script that does polls the battery's capacity at regular interval when it's status changes to Discharging:
I regularly forgot to disable it when en route, having to save power without any need of my wlan - it may not be too much power to save, but it's also a very simple little script to execute at startup (maybe with a sleep of 60s) to save it:
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  ## SLEEP IF BATTERY IS LOW
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  SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", <s>ATTR{capacity}=="2", RUN+="/usr/bin/systemctl suspend</s> RUN+="/script/to/poll/battery/and/suspend/system.sh"
  #!/bin/bash
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There may also be a uevent that fires when the battery reaches an alarm state (when /sys/class/power_supply/BAT*/alarm is reached or changes).  I have not tested this on my own system yet or figured out just how that file works yet. [[User:Ego.abyssi|Ego.abyssi]] ([[User talk:Ego.abyssi|talk]]) 23:32, 3 March 2013 (UTC)
   
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essid="`iwconfig wlan0 | grep ESSID | awk {'print $4'}`"
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Strange, on my system battery sends "change" uevent each time battery is charged or discharged by 1%, so rule works perfectly and polling is an overcomplication.
if [ "$essid" == "ESSID:off/any" ] ; then
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--[[User:Eruditorum|Eruditorum]] ([[User talk:Eruditorum|talk]]) 06:48, 30 March 2013 (UTC)
sudo iwconfig wlan0 txpower off
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fi
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Revision as of 06:49, 30 March 2013

Other tweaks

No explanations with these tweaks? What do these do? Is linking to the source enough or should we describe what we're doing in detail? I'm never too comfortable with "do this" type instructions without a "this is why" explanations.--Multiphrenic 09:05, 27 April 2011 (EDT)

Udev Rule to Suspend System

The udev rule could be edited to run a script that does polls the battery's capacity at regular interval when it's status changes to Discharging:

## SLEEP IF BATTERY IS LOW
SUBSYSTEM=="power_supply", ATTR{status}=="Discharging", ATTR{capacity}=="2", RUN+="/usr/bin/systemctl suspend RUN+="/script/to/poll/battery/and/suspend/system.sh"

There may also be a uevent that fires when the battery reaches an alarm state (when /sys/class/power_supply/BAT*/alarm is reached or changes). I have not tested this on my own system yet or figured out just how that file works yet. Ego.abyssi (talk) 23:32, 3 March 2013 (UTC)

Strange, on my system battery sends "change" uevent each time battery is charged or discharged by 1%, so rule works perfectly and polling is an overcomplication. --Eruditorum (talk) 06:48, 30 March 2013 (UTC)