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I've been using the tlp utility for optimizing my battery settings on a ThinkPad 4th generation X1 Carbon running Ubuntu 16.04. I would like to set charging thresholds as follows:

$ sudo tlp setcharge 75 80
Error: ThinkPad extended battery functions not available.

Looking through the documentation it recommends installing the following:

sudo apt-get install tp-smapi-dkms acpi-call-dkms

Which I've already done. It also recommends looking at the recommendations under tlp-stat

+++ ThinkPad Extended Battery Functions
tp-smapi   = inactive (kernel module 'tp_smapi' load error)
tpacpi-bat = inactive (kernel module 'acpi_call' load error)

Perhaps hardware has changed? How can I further diagnose my problem? Are there alternatives that work for the hardware within the 4th gen X1 Carbon?

Update

Secure boot was still active. Going through the instructions below from @linrunner and also removing Secure UEFI Boot were sufficient to resolve the problem. It may have been that things would have been fine with just the secure boot change though.

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  1. Install TLP 0.9 from the PPA for better diagnostics on kernel modules.

  2. You may uninstall the tp-smapi-dkms package. tp-smapi is not supported on your hardware (0.9 will tell you this).

  3. See the FAQ how to load the acpi-call module manually and check the output for errors (add output to your question)

  4. When 3. is unsuccessful try to reinstall the package, check (and add) the output too:

    sudo apt-get install --reinstall acpi-call-dkms

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