BIOS guide

Great! better to be on the backlog than nowhere


Is there runit equivalent command for that systemd command to get into bios?

PS: I hate to have to reboot and repeatedly press, sometimes if missed you have wasted like 1-2 mins xd (don’t take PS seriously btw, funky language use though, but its quite annoying).

I did a fair bit of searching and didn’t come up with a good alternative.

What kills laptop batteries fast is having it sit at 100% SoC (~4.2v per cell) for long periods of time, and is exacerbated by higher temperatures (typical inside a laptop). “Disconnecting” a battery will do nothing unless it’s at a lower SoC. I vote for a selectable charge threshold. If you set your SoC to 70-80% you can massively extend the life of the battery. I’ve run 80% on my current Lenovo X1 (6th) and the battery has only experienced a few percent degradation.


Hmm, I wrote a script myself.


# /usr/local/bin/reboot-firmware
if [[ $EUID -ne 0 ]]; then
  >&2 echo "This script must be run as root"
  exit 1


[ -f $OS_INDICATION_SUPPORTED_FILE ] && [ "$(( $(cat $OS_INDICATION_SUPPORTED_FILE | od -An -t u8 --read-bytes=8 --skip-bytes=4) & 1))" -eq 1 ] || {
  >&2 echo "OsIndications is not supported"
  exit 1

DATA="$([ -f $OS_INDICATION_FILE ] && cat $OS_INDICATION_FILE | od -An -t u8 --read-bytes=8 --skip-bytes=4 || echo '0')"

BUFFER="$(printf '%08x' $BUFFER_ATTR | sed -r -e 's/(..)(..)(..)(..)/\\x\4\\x\3\\x\2\\x\1/')$(printf '%016x' $DATA | sed -r -e 's/(..)(..)(..)(..)(..)(..)(..)(..)/\\x\8\\x\7\\x\6\\x\5\\x\4\\x\3\\x\2\\x\1/')"

RUnit does actually do its own job, to be an init system but not a exit system :slight_smile:. It does follow the unix philosophy.


You can set thresholds using tlp which forwards the setting to EC of the laptop Battery Charge Thresholds — TLP 1.3.1 documentation (


@Animesh_Sahu Do you have those thresholds working on Framework? The docs seem to say they only work on certain Lenovos but maybe they are out of date?

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I did not got hands on framework till now, its neither in my country nor my parents (I’m a student) can afford it until my current laptop goes out completely, but I’m sure my next laptop is going to be 100% framework…

The officials have confirmed that the EC is exposed, and I’d guess it should work without any problem on framework.

As pointed out, it is based on chromium-ec which was probably used in old lenovo thinkpads as well (zephyr framework appeared in 2016), even if sources might be different it would be easy to integrate as can take inspiration from old tlp sources and adjust accordingly for framework.

Add a new forum page if it does not work, implementation should be quick, unfortunately can’t test it out from my side :^(

I tried to set battery thresholds and it does not work with the defaults settings anyway.

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@Kieran_Levin, is there any documentation regarding the Framework’s EC implementation available to the community?

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Yeah, if we could get documentation, we could easily patch TLP for the Framework EC.


Does anyone know how I can set the battery charging thresholds in Windows?

@RandomUser I’m not sure it’s exposed to the software yet. The Framework team has already alluded to the fact that adding that configuration to the BIOS is on their roadmap, until then Windows can’t do anything about charging thresholds. There is freeware that’ll alarm you when certain thresholds are met, but those are hacky and require you to unplug and replug manually anyways.
I’m not sure what it will look like when the Framework team gets around to that, whether it’ll be setting charge percentages in BIOS like I’ve seen on a recent-generation Dell laptop, or whether they’ll give a utility to be able to control charge levels through a tool like Asus and Lenovo provide.

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Crediting John Lombardo’s post here since he posted another quite literally hacky solution, but one that seems much more functional than the normally available utilities.

According to framework, and assuming I didn’t misread, the EC is exposed! So it should be possible to use rweverything to set the charge limit, much like controlling a fan.


Have not heard of that utility, I’ll have to try it out soon. If someone doesn’t beat me to it I’ll post what my experience was

Yeah, that’s what I’ve read as well. But didn’t get the details as to where on the EC.

Also, regarding fan speed, does anyone have the EC details for that too?


Re F2 to enter the BIOS and F12 to enter the one-time boot override, I’ve only gotten it to work if I also press the Fn key:


Which might be obvious since that’s how you get the function keys, but might be worth mentioning for those of us who don’t know :slight_smile:


Have you enabled the FnLk before (Fn + Esc)? It’s a persistent function lock. (Persistent across reboots and OS)

OOTB default is that the FnLk is off. I’m wondering if that’s why you need to do Fn-F2 and Fn-F12.


That’s good to know as well!