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Thread: How set battery charge limit in T420, T430, T430s, T430u, etc in Ubuntu 12.04

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    May 2013
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    Post How set battery charge limit in T420, T430, T430s, T430u, etc in Ubuntu 12.04

    You want to set charge limits for laptop batteries because this may lead to longer battery life in the long run. For old models of thinkpads, see tp_smapi: http://www.thinkwiki.org/wiki/Tp_smapi. "f you are installing on a recent Thinkpad that has an Ivy Bridge processor (X230, T430, T530, etc.), tp_smapi will not work." Below is how I successfully set the charge limits in T430u, using package tpacpi-bat.

    Briefly, (1) install acpi_call; (2) find the acpi location to modify; (3) install tpacpi-bat; (4) modify.


    (1) You can get acpi_call here: https://github.com/mkottman/acpi_call
    Extract and "cd" to that folder (in the terminal).

    sudo make
    sudo make install
    sudo depmod -a
    sudo modprobe acpi_call


    (2) install acpidump

    sudo apt-get acpidump
    sudo acpidump -b -t DSDT -o /tmp/dsdt.aml
    (maybe an error: Wrong checksum... I got it but it is ok)
    iasl -d /tmp/dsdt.aml
    cat /tmp/dsdt.dsl | grep \\\\_SB\.PCI.*HKEY -o | uniq
    Remember the output, mine is "\_SB.PCI0.LPCB.EC.HKEY" (thinkpad T430u)


    (3) Get tpacpi-bat here: https://github.com/teleshoes/tpacpi-bat

    Extract and "cd" to that folder (in the terminal).
    Open the tpacpi-bat file in the folder with gedit: (sudo) gedit tpacpi-bat
    Change "my $aslBases = ..." to what we got in (2). I changed all of them, default, W520, L430,... all.


    (4) Now you may follow the README, for example (at the tpacpi-bat folder):

    sudo ./tpacpi-bat -v -s ST 0 70
    is going to change the start threshold to 70%.

    sudo ./tpacpi-bat -v -s SP 0 90
    changes the stop at 90%.


    (5) Reboot.

    You WON'T notice difference in the battery icon in unity-indicator. But the voltage settles down when it is charged to 90%, for example.

    Let me know any mistakes I made.
    Last edited by tpmaxwell; May 24th, 2013 at 01:22 AM.

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