Longer life for batteries

[micmarluc]

The problem you're addressing (if any)
Currently, it is not possible to limit the battery charge when the computer is plugged into the mains (for all users)

Describe the solution you'd like
Add a firmware option (if possible) to limit the battery charge for example to 80% - with the possibility to go back to 100% if necessary.

Where is the value to a user, and who might that user be?
More savings and less pollution for everyone

Describe alternatives you've considered

Additional context

[macpijan]

Hello @micmarluc
Thanks for the report. It would be nice to provide more details on what device are you referring to.
I assume it is one of the NovaCustom laptops.

[micmarluc]

Hello @macpijan
Sorry for forgetting !
Indeed, it is a NovaCustom laptop : NS70.

[micmarluc]

Hello @macpijan
1/ More details about my laptop : NovaCustom NS70MU i5-1135G7
2/ Please, can you add the label "enhancement", I did not understand how to do it. I searched in the GitHub documentation (managing labels), but I can’t find any right sidebar that gives me access to the settings. Thank you

[pietrushnic]

@micmarluc I guess that only organization members can add labels.

[UndeadDevel]

This seems like a duplicate of #246 but FWIW having this option is indeed very much desired; I'm using Heads from NitroKey and on their 2.1 release (~June 2023) the system exposed /sys/class/power_supply/BAT0/charge_control_end_threshold and /sys/class/power_supply/BAT0/charge_control_start_threshold, which allowed to manually set the charge limits. Now I upgraded to version 2.4 (based on coreboot 1.7.2) and those files have disappeared such that now there doesn't seem to be the possibility of setting charge limits any more.

[pietrushnic]

Now I upgraded to version 2.4 (based on coreboot 1.7.2) and those files have disappeared such that now there doesn't seem to be the possibility of setting charge limits any more.

Currently, we do not support Dasharo (coreboot+Heads) on Novacustom. Saying that issues regarding Nitrokey releases should go to the Nitrokey repository.

Of course, we are working on enabling Dasharo (coreboot+Heads) and hope to deliver this month. I'm not sure what else we can do right now. @macpijan cc

[UndeadDevel]

Ok, I already reported it at their issue tracker; I just thought that this is probably an upstream issue with coreboot, but I could be wrong about that.

[wessel-novacustom]

This has been developed now, I think the issue can be closed. @macpijan

[wessel-novacustom]

@micmarluc The feature has been implemented. Could you close the issue, please?

[tlaurion]

@macpijan @wessel-novacustom closed too soon? Seems like EC not discovered by coreboot with system76_acpi kernel driver not loading, so BAT0 thresholds not avail me for tlp? Not sure what Heads can do here.

linuxboot/heads#1647 (comment)

[tlaurion]

Should reopen until #820 fixed

[macpijan]

It was implemented in the firmware (edk2 talking to EC) for the UEFI firmware variant.