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linrunner / TLP

TLP - Optimize Linux Laptop Battery Life
https://linrunner.de/tlp
GNU General Public License v2.0
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T480 battery hot swap causes sudden shutdown #690

Closed vdbash closed 1 year ago

vdbash commented 1 year ago

I have a Lenovo T480 with ubuntu 22.04 with main(internal or BAT0) and auxiliary batteries (BAT1). When the device using the external battery (BAT1 discharging), if I remove it I expect the power source automatically switch to main battery and device stays on. But the what actually happens is that the device looses the power and shuts down. Then I can restart the laptop with internal battery. Now if I add the external battery again it does not recognized and tlp-stat tells me that only BAT0 is available.

linrunner commented 1 year ago

Which battery is discharged is solely up to Lenovo's embedded controller (EC) firmware, TLP has no control over this.

I recommend resetting the EC using the emergency reset hole on the bottom (refer to the hardware maintenance manual). If this does not help, there is a hardware problem (battery or system board).

vdbash commented 1 year ago

Hi The problem is not which battery discharging, the problem is that it is not doing a hot swap. When I remove the external battery while the internal battery has 80% charge, the laptop shouldn't lose power and go off. Anyway, you can consider it a bug report if you like since you already closed the thread. I have uninstalled TLP and now I can hot swap

linrunner commented 1 year ago

Oh yes, we are talking about the same thing.

The moment you remove the active, i.e. just discharging, external battery (BAT1) to "hot swap" i.e. change it, the EC must switch to the internal battery (BAT0) to commence discharging it and thus operate the ThinkPad. All this is controlled by the EC and TLP has no influence on it, because there is simply no API for it from Lenovo.

I think it is likely that the problem will reoccur even without TLP. Especially this ThinkPad generation is quite prone to EC malfunctions, see e.g.

Of course, I can't completely rule out the unlikely possibility of a side effect of TLP, but I haven't the slightest idea how to narrow down your problem. Even after 13 years of intensive work on the subject, I still don't know everything about it.

Good luck.

vdbash commented 1 year ago

Thanks. Appreciate it.

On Fri, May 12, 2023 at 11:06 AM linrunner @.***> wrote:

Oh yes, we are talking about the same thing.

The moment you remove the active, i.e. just discharging, external battery (BAT1) to "hot swap" i.e. change it, the EC must switch to the internal battery (BAT0) to commence discharging it and thus operate the ThinkPad. All this is controlled by the EC and TLP has no influence on it, because there is simply no API for it from Lenovo.

I think it is likely that the problem will reoccur even without TLP. This ThinkPad generation is prone quite to EC malfunctions, see e.g.

- https://linrunner.de/tlp/faq/battery.html#disabling-the-charge-thresholds-does-not-work

Of course, I can't completely rule out the unlikely possibility of a side effect of TLP, but I haven't the slightest idea how to narrow down your problem. Even after 13 years of intensive work on the subject, I still don't know everything about it.

Good luck.

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