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I'm setting up my old MacBook Pro as a Time Machine Server with ubuntu, and was wondering whether someone managed to do charge limiting on a Mac. This thread has some answers, none of them are Mac-specific though, and I believe this is a hardware-specific thing...

Thank you in advance!

KielRiefe
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  • The battery is 100% managed by the UEFI on Intel-based Apple hardware, and only MacOS can interface with the UEFI APIs to make changes – matigo Mar 06 '23 at 02:31

2 Answers2

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I've accidentally solved this by setting a charge limit using bclm before installing Ubuntu. After the installation, the macOS partition is wiped, but the charge limit persists (in the MacBook's SMC) - at 80% capacity, Ubuntu tells me my battery is full and won't charge!

I can't change the charge limit anymore, but I want the laptop to run on the charger anyway ;)

Now let's hope the SMC doesn't get reset...

KielRiefe
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Have a look at this kernel module. It supports intel based macbook.

https://github.com/c---/applesmc-next

If applesmc-next is compatible and it works, you will be able to set threshold using command-line and gnome shell extension.

Command line

echo '60' > /sys/class/power_supply/BAT0/charge_control_end_threshold

Gnome shell extension Battery Health Charging

https://extensions.gnome.org/extension/5724/battery-health-charging/

Some information https://maniacx.github.io/Battery-Health-Charging/device-compatibility/apple-intel-series

Max
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