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rated 0 times [  19] [ 0]  / answers: 1 / hits: 12468  / 2 Years ago, sat, october 22, 2022, 8:20:14

My Asus EEE netbook performs a hard shutdown when it reaches low battery power, without giving any warning - i.e. the power just goes off, without any shutdown process. I can't find anything in the syslog, and no error messages are printed before it happens. I've had this problem on previous (K)Ubuntu versions, and hoped updating to Ubuntu Precise would help resolve the issue, but it hasn't.



The option in the Power application for "when power is critically low" is currently blank - the only options are a (grayed-out) hibernate and "Power off".



I have re-installed indicator-power to no effect. The time remaining reported by acpi is unstable, as is the time remaining reported by gnome-power-statistics. (For example, running acpi twice in succession, I got 2h16min, and then 3h21min remaining. These sorts of jumps in the remaining time are also in the gnome-power-statistics graphs.)



It might be possible to write a script to give me advance warning (as per @RanRag's comment below), but I would prefer to isolate why I don't get a critical battery notification from the system before this happens, so that I can take action as appropriate (suspend/shutdown/plug in power) when I get a notification.



Some additional information on the battery:



kroon@minia:~$ upower -i /org/freedesktop/UPower/devices/battery_BAT0

  native-path:          /sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/PNP0C0A:00/power_supply/BAT0

  vendor:               ASUS

  model:                1005P

  power supply:         yes

  updated:              Fri Aug 17 07:31:23 2012 (9 seconds ago)

  has history:          yes

  has statistics:       yes

  battery

    present:             yes

    rechargeable:        yes

    state:               charging

    energy:              33.966 Wh

    energy-empty:        0 Wh

    energy-full:         34.9272 Wh

    energy-full-design:  47.52 Wh

    energy-rate:         3.7692 W

    voltage:             12.61 V

    time to full:        15.3 minutes

    percentage:          97.248%

    capacity:            73.5%

    technology:          lithium-ion

  History (charge):

    1345181483  97.248  charging

    1345181453  97.155  charging

    1345181423  97.062  charging

    1345181393  96.970  charging

  History (rate):

    1345181483  3.769   charging

    1345181453  3.899   charging

    1345181423  4.061   charging

    1345181393  4.201   charging



kroon@minia:~$ cat /proc/acpi/battery/BAT0/state

present:                 yes

capacity state:          ok

charging state:          charging

present rate:            332 mA

remaining capacity:      3149 mAh

present voltage:         12612 mV

kroon@minia:~$ cat /proc/acpi/battery/BAT0/info

present:                 yes

design capacity:         4400 mAh

last full capacity:      3209 mAh

battery technology:      rechargeable

design voltage:          10800 mV

design capacity warning: 10 mAh

design capacity low:     5 mAh

cycle count:              0

capacity granularity 1:  44 mAh

capacity granularity 2:  44 mAh

model number:            1005P

serial number:            

battery type:            LION

OEM info:                ASUS

More From » power-management
 Answers
6

When a battery reaches to the point of time to take critical action taking level , Ubuntu won't warn you about this, instead it just perform the action required (such as suspend, hibernate, shutdown etc, based on your choice). This is the setting and it can't be changed. But Ubuntu should give you a warning, when battery reach low level and critical level.



By default, Ubuntu uses time remaining as a trigger of it's pre-defined action.




  • You will be given a low battery warning, before 1200 seconds (20 minutes) to be empty.

  • You will be given a critical battery warning, when it reaches 300 seconds (5 minutes) remaining

  • Battery critical action is performed when only 120 seconds (2 minutes) remaining.



The power statistics from your output suggests a bad/damaged battery. In these cases, it is hard for Ubuntu to measure actual time remaining data. Also the battery drains quickly between from 300 seconds to 120 seconds, so just try to shut down the PC which is configured in the settings.



I suggest you to do this,




  • First change the policy of trigger from time to percentage. 



    gsettings set org.gnome.settings-daemon.plugins.power use-time-for-policy false

  • Then raise the percentage required to give you a warning, the default is 10%. Change it to 30%.



    gsettings set org.gnome.settings-daemon.plugins.power percentage-low 30

  • Then raise the percentage required to be considered as critical to 20%, default is 3%.



    gsettings set org.gnome.settings-daemon.plugins.power percentage-critical 20

  • Then raise the percentage required to take the critical action, it is now 2%. change it to 15%



    gsettings set org.gnome.settings-daemon.plugins.power percentage-action 15

  • Then change the critical action to be taken to hibernate, instead of shutdown. You need to first enable the hibernate option.





    Then use this command to change it to hibernate.



    gsettings set org.gnome.settings-daemon.plugins.power critical-battery-action hibernate



I think, this should solve your problem. If you still have problems with level, raise the levels even higher.


[#36634] Sunday, October 23, 2022, 2 Years  [reply] [flag answer]
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