Re: [Libreboot] x60 battery seen empty, but fully charged.

[megagolgoth]

Please find my answer below :

Le 15/01/2016 16:52, Daniel Tarrero a écrit :
> Hi!
>
>  From your talk i have two theories you can give a try:
>
> 1.- Your Linux is not using "power save" features, so it drys your batt
> faster than windows (the most probabbly i think)
Fully charged battery provide me more than 2 hours with Lenovo BIOS, but 
less than 15 minutes with LibreBoot.
> 2.- Your Linux is miss-meassuring the battery (it thinks is empty, but
> have yet more power. More rare, but also seen.)

More probability for this type of issue.

> For the first theory (1), i will check if "laptop-mode-tools" and
> "pm-utils" packages are installed. In my Debian the first is on charge
> of spin down hard drives and send "powerdown" state for unused
> peripherials. The second are "power-management" tools
Both packages were installed, without improvement.
> Also take a look at some other tweaks you can perform:
> http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption
>
> Also interesting for you will be the "powertop" utility to set up
> powersaving setting and diagnose power consumption.
>
> I have found also a custom package claiming it handles "advanced power
> management" fot thinkpad laptops. If the "laptop-mode-tools" doesnt work
> for you, give it a try!
>
> In Debian you can tweak some stuff in kernel in order to save some
> power, the more interesting should be the laptop mode:
>
> $echo 5 > /proc/sys/vm/laptop_mode
>
> ... but you can also turn off unused ports, limit screen backlight, turn
> off the lasers (CD/DVD)
>
> For the second theory (2) i have no idea how to do that, but i remember
> a similar problem year ago, and someone got to cheat kernel to think it
> had more battery (and it worked). It had something to do with how many
> cells the system thought was available.
I prefer reading correctly the amount of power from the battery.

The battery is a Sony Li ion, FRU 95p5030.
> Take a look at the special files here, they store all information and
> parameters that the kernel has about your battery:
>
> $ls /sys/class/power_supply/BAT0/
>
> then you can "cat" to read values, like for example, full charge and
> current charge of battery installed:
>
> $cat /sys/class/power_supply/BAT0/charge_full
> $cat /sys/class/power_supply/BAT0/charge_now
>
>
> one last advice: do one change at a time, check resoults!
>
> Good luck and share you experiences! :)

Yep, thank you :)

> El vie, 01-01-2016 a las 16:56 +0100, megagolgoth escribió:
> > Hi,
> >
> > I've got a problem with the last build (20150518, and after a short
> > test today, also with the 20150208)) of Libreboot for x60 (fr
> > azerty keyb). The BIOS (and Ubuntu, too) see my battery empty
> > (orange bat light), after approximatively 10 minutes. The battery is fully 
> > charged
> > (with Lenovo external charger, or charged on the x60).
> >
> > With the Lenovo proprietary BIOS I've 3-4hours of autonomy, with
> > the same battery (without charging it another time, just flashing
> > back the Lenovo BIOS).
> >
> > Lenovo power application on Windows, with Lenovo proprietary BIOS see 214 
> > cycles for this battery.
> >
> > I don't know where to start to diagnose the problem... Is a known problem?
> >
> > Megagolgoth.