Public bug reported:
Hello.
I'm here to expose what I think is a bug somewhere on the Ubuntu distro.
I recently installed Ubuntu 12.04 on my Samsung N220, following the instruction
given by voria on his forum. Everything goes right.
Trying to save energy (and not liking being constantly given microwaves by my
laptop), I switched off the wifi. I was surprised to feel that doing this made
my battery last less time than with the wifi on and connected to a wireless
network.
To make sure it was not just an impression, I installed Powertop (which gives
the battery discharge rate in nearly real time). I found out that with the wifi
ON and connected, my idle discharge rate was nearly 5.2 Watts, and that with
the wifi OFF, my idle discharge rate didn't go under 6 Watts.
That is weird for sure.
To check if it is not a hardware problem, I rebooted using the preinstalled
Windows 7. And with windows, the discharge rate is about 5.2 Watts with the
wifi OFF, and 6 Watts, with the wifi ON, which seems quite normal to me.
What I did is unload the wifi module on linux (modprobe -r Ath9x) to see what
happens : well, with the module unloaded, the discharge rate is still 6 Watts.
I don't know how to explain all this. I thought it was worth reporting
it here. Maybe someone would have any idea on how to fix this weird
behaviour.
Thank you for your reading and your answers (I hope you will give me any
explanations).
Touil
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: battery discharge power wi-fi wifi
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https://bugs.launchpad.net/bugs/1011161
Title:
Turning wifi OFF increases the battery discharge rate
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