[TRACKING] Battery flipping between charging and discharging / Draws from battery even on AC

Yes it is, or rather, it was. I’ve bumped it up to 100% and I’ll see what happens over the course of the day. I’ve run two CPU intensive builds so far without a problem, so it’s looking promising.

EDIT: I’ve had a few hours of thunderbolt stability now. So I’m fairly confident that the workaround of setting the charge limit to 100% works.


I really hope this gets addressed in a Framework firmware update.
That’s sad to have to slowly destroy the battery (keeping it plugged for long durations with a 100% limit) in order to gain stability.

The problem is even worse with a Nvidia eGPU, because the nvidia kernel modules do not support hot-unplug, and each disconnection leads to system instability and to a freeze a few minutes later.


There may still be other options to try which better preserve the health of the battery.
I have similar problems however on an 11 gen with a Thunderbolt 3 dock. A reason for this seems to be that charging does not really stop when the charge limit is reached. The laptop is constantly switching between charging and discharging.
But I have not seen any disconnects since I started forcing the charging current to
zero with fw-ectool using this command:

sudo ectool chargecurrentlimit 0

If you don’t need the full bandwidth to your docking station you also may consider downgrading the connection. In my case it also helps to force the connection to USB 3 instead of Thunderbolt 3 by using an USB 3 cable.

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What does this do? I’m guessing it prevents the battery from charging, so effectively it’s running on external power.

I see the same with a CalDigit TS4, on a 12th generation, BIOS 3.04.

One way to reproduce this is (assuming battery level is >30% and <99%):

while true
      date ; sudo ectool fwchargelimit 30 ; sudo ectool console | grep "Battery\|Charge Limit" ; sleep 60 ; date ; sudo ectool fwchargelimit 99 ; sudo ectool console | grep "Battery\|Charge Limit" ;  sleep 10

The dock disconnects basically every time when issuing fwchargelimit 30. The sleeping time in between is necessary. When running watch ectool battery in parallel, and looking at the numbers, it seems that the disconnects are triggered by switching from high charging current to 0. (The sleeps ensure that some high enough charging current builds up before forcing it to 0 again.)

I’ve also once observed a disconnect in the other direction, i.e., when switching from 0 to high charging current.

I wrote a small daemon that works around this:

The idea is to use ectool chargecurrentlimit to set the charge current slowly to a low value when above 60%, and I’ve set the firmware charge limit in the BIOS to 65%. This makes sure that whenever I’m close to 65%, only a low charge current is applied.

I haven’t experienced any disconnects with that daemon.

This really appears to be a hardware issue. There are multiple threads about this, reproducing this with different generations, different BIOS versions, different OS, and different docks:

cc @Matt_Hartley

This is related to [TRACKING] Battery flipping between charging and discharging / Draws from battery even on AC . See my comments there.


I’d be lying if I said that I’ve been tracking it since I stopped responding, It wore me out trying to debug it so I haven’t dealt with it since the first 3 months. But this sounds like it has a great chance of being the issue, I will test it once I have replaced my display (stepped on it a couple months ago and decided to wait for the Matt displays before purchase). Mine has been set to charge to a max of 60% since day one for battery longevity. While proving that the issue is gone could take weeks since it didn’t happen reliably frequently for me, The fact you think you have identified the root cause and provided a script to reliably trigger it means that all the work for STR has been done and I just have to verify it! I must say I am very hopeful that my expansion bays don’t work.

And seeing the reason given for closing my thread, I would like to note that although I originally plan to run an OS on it, It didn’t work as a media bay either once I gave up on that. All the hours I spent testing it were done with the OS on an NVME an expansion card being used for media files or just as a drive to write and read random data from for testing. I knew it was a hardware issue isolated to the framework itself since the cards (I bought a second one just to verify the first one wasn’t the issue) worked perfectly fine in other systems. This would finally explain why, and we can move on to resolving the actual issue of true! (Oh hell, you even provided a temporary work around! Literally all the work! Pre-emptive thank you!)

Oh also note that I’ve had issues with my display port card the few times I’ve used it. Unlike with my storage card, I didn’t notice that much since the issue would resolve itself. A disconnects for a few milliseconds causing a display to flicker off and then back on required me to be actively looking at the screen. Storage card couldn’t resolve itself since the colonel would assign it a new name in the file system would remount the old version as read only. I have not, however, ever had an issue with the usba card… But I also never used it after initial install which I didn’t do plugged in.

I can’t remember if I ever tested anything while unplugged, It just takes so long for the issue to reliably appear without knowing the trigger that leaving it unplugged couldn’t actually prove the issue was no longer present before the battery died. Only thing I can do while I’m not plug is prove that it’s not a charging related issue since the other way around isn’t an option with occasional 4days between random disconnects. We will see… Now that there is hope and direction I will gladly test again. Hopefully this time I won’t go insane doing so!

On an off note, I had a 50-50 chance of my Wi-Fi disconnecting at the same time as the card stopped working. Turning wifi off and back on with the wifi/Bluetooth button resolved the issue. I could never figure out if they were related, and the issue happens without the card in as well So I was assuming it was a bad router… But perhaps the power issue extends beyond the expansion bay and may affect some other modules as well. But I’m getting ahead of myself here. We can come back around to explore the full scope of this issue after getting the community to test and hopefully prove the root cause with expansion cards. How many people have tried both your STR to prove it, and your work around thus far that you know about? And how many days or weeks or months have people gone without issue since implementing your work around?

@Matt_Hartley I have done 0 testing since my screen is broken ATM but I think this is probably it! Finally an explanation not just why my card works reliably with other computers but not the framework, but also an explanation on why there’s also a split in the community as to whether or not there’s a problem with cards with some even running distros off of it. Distros, running off of it, btw is normal, fine for usb. Completely should not be a problem. Something we kinda wanted to do. An what more something the product page itself advertises as a feature since what else would you need this speed for. I understand the thread was going nowhere, but that bull doesn’t pass as a response, it’s not 2005 anymore and your 1tb card supports it fine as advertised, the laptop however does not under some not yet understood conditions.

Most people don’t configure charge limits, if the vast majority of the people who had issues did… Everything starts to make sense. If you guys are able to reproduce the issue using the script he provided, You should probably also poll those who reported having issues and ask if they set the charging threshold limit. My knowledge you haven’t yet identify the root cause of the issue, and it’s way too frequent oven issue for those of us who have the issue on only your laptops to hand wavingly say you shouldn’t trust in USB… Again, it’s not 2005, and your expansion cards are not 5usd Walmart USB sticks

Off today, so will make this short.

Looks like someone above has a script to address this.

As stated in multiple other threads, please see this kb article, dock vs expansion card section.

Some docks have shown to be successful, others have had mixed results.

This remains unchanged.

This looks promising for those docks that present this problem and may offer some help here.


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Hi @Neil_Green,

I think what @real_or_random said, already answers your question.

But you’re right, sudo ectool chargecurrentlimit 0 cuts off the charging current. I only use it, when connected to the dock, from which the laptop gets external power. The idea was actually to reduce the flipping between relatively high charge currents and discharging that I always observed shortly after disconnects. So I suspected this to be the cause of the problem.

If the battery is below the charging limit and I want to charge it I often use sudo ectool chargecurrentlimit 300 or other low limits instead. This extends the charging time. And I’ve never seen disconnects while charging. It also appears that the charge current limit does not need to be set to 0. A low charge current limit seems to be sufficient, even if the battery has reached the ‘fwchargelimit’.

Right, and that’s what my script does in fact. I edited the description above.

Just me so far, but I’ve been using it for a few weeks now.

Indeed. I’d still appreciate it if you could confirm the possibility that this is a hardware or a firmware problem, and forward it to whoever is responsible and can take a look. Here’s a possible explanation:

The logic in Blaming EmbeddedController/baseboard/fwk/battery.c at 72748b7d0aa4ac18204f00608ed61451b10314a3 · FrameworkComputer/EmbeddedController · GitHub (this code is custom to the Framework!) sets the charging mode to CHARGE_CONTROL_IDLE when the set charge threshold is reached. If the charge current happens to be high at this point, it’s suddenly reduced to 0, and this is precisely what causes disconnects in my experiments.

Note that CHARGE_CONTROL_IDLE is even set if the max threshold is 100% (i.e., the default), but still, it seems that only users with a threshold <100% seem to suffer from disconnects. I suspect that is because the other parts of the charging logic make sure that the charge current is low when close to 100%. And when a low current is suddenly set to 0, this does not result in a disconnect according to my experiments.

All of this is speculation until tested, but it seems plausible that this is the cause. A second reason to investigate this code further is that it may be the reason for the flipping between charging and discharging.


Thanks for this.

I finally got round to setting it up yesterday, and today’s result so far look very promising. I’ve set the charge limit to 60% and, with the appropriate tweak to the shell script, I’ve not seen any disconnects so far while the laptop is charged to the limit.

I would be happy to escalate to engineering. Do we have an active ticket open for this?


No. Would that be a strict requirement to escalate it? My write-up above has everything that I know about this issue.

It would be better as it gets into an official queue.

I have just opened a ticket. (But I don’t have a ticket number that I could point you to. The title is “Thunderbolt disconnects sporadically with AC connected when battery level close to threshold and threshold < 100%”)


I got some more questions from support in the ticket a while ago, but to be honest, I’m not keen on replying and going through this entire ticket process, which involves getting more questions and running experiments over and over again.

I believe in this specific case, it’s mostly a waste of time. There’s good evidence to believe that this a firmware bug, and everything needed to understand it is in this thread. I spent a lot of time on this already: I wrote specific instructions to reproduce the issue, and I even wrote a workaround. Now it’s Framework’s responsibility to spend more time on it and look into the details.

I’m happy to open an issue at GitHub - FrameworkComputer/EmbeddedController: Embedded Controller firmware for the Framework Laptop if this gets it to the relevant developers quicker, but I believe the better way forward is that somehow (e.g., @Matt_Hartley) escalates it to engineering.

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Just pinging here for other randos who might be routed here:

The ectool mentioned here is built from GitHub - FrameworkComputer/EmbeddedController: Embedded Controller firmware for the Framework Laptop - clone current main branch (hx20-hx30)

make utils
sudo cp build/bds/util/ectool /usr/local/bin

you (might?) also need to disable secure boot.

I just set this up under the same conditions. Been seeing this under ubuntu. Will report back if it seems to fix my monitor disconnecting.

Related to the thread: The core problem is the usb-c port resetting when power changes rapidly, which happens with the official brick and nothing else plugged in. I think support is getting confused when we say “Dock” or “monitor” or whatever. They want to troubleshoot all the dock things but unless the power is stable with the official supply these docks are never going to work right.

Thanks for the daemon and investigation! This thread was very hard to find.

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I’m using the version from GitHub - DHowett/framework-ec: Embedded Controller firmware for the Framework Laptop, see Exploring the Embedded Controller.

As I wrote here, I don’t think that’s true. The connection to the charger is stable with (and without) the official charger. It’s the EC firmware that decides not to draw power, and this can cause USB-C/thunderbolt disconnects.

@real_or_random Troubleshooting is not fast, it’s a process. Please continue with the ticket, even if you don’t feel it’s worth it.

Part of the process is escalation as needed.

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Merging this as multiple threads for a related issue simply makes our job that much more difficult to track.

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