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#1 2020-12-14 13:36:53

Registered: 2020-12-11
Posts: 3

[SOLVED] ThinkPad X1 Carbon (Gen 8) - Second Battery not detected

Do have a brand new X1 Carbon Gen 8, and installed Vanilla Arch with dwm on it.
Initially, it showed 14h of battery life. Yet after an update, two batteries were detected.

acpi returns:
Battery 0: Discharging, 0%, rate information unavailable
Battery 1: Unknown, 99%

This seems to result only one of the built-in batteries to be loaded, while the rest either stay dormant, or won't be used.

I tried solving the problem with:
1. Hardware reset (let it run dry, keep on-switched pressed for a minute, then reboot)
2. All kinds of variations in battery settings in BIOS
3. Checking fwupd for updates - none found
4. installing tlp
5. installing tlp_smapi (returned some error Failed To Start Load Kernel Modules - systemctl status systemd-modules-load.service indicated that the hardware wasn't recognised, so I deinstalled it)
6. installing acpi_call (didn't help - so I deinstalled it since it's deprecated)
7. Trying various life disks from other, more n00b-oriented distributions (Ubuntu, Manjaro) without success
8. Bringing sacrifices to the machine spirit and prayers unto the Omnissiah - yet futile, the tech priests from Mount Olympus won't come to help smile

I'd be grateful for any kind of help or suggestions. Thank you!

Last edited by romero (2020-12-15 02:37:05)


#2 2020-12-14 15:46:29

Registered: 2020-12-11
Posts: 3

Re: [SOLVED] ThinkPad X1 Carbon (Gen 8) - Second Battery not detected

OK - that was super embarrassing.

After Battery 1 appeared once or twice when changing rooms, I looked into /sys/class/power_supply/ and found a battery with a different designation.

cat /sys/class/power_supply/hidpp_battery_3/uevent   returns:

POWER_SUPPLY_MODEL_NAME=Wireless Mouse MX Master 3

So that was the culprit - the battery of my MX 3 mouse (connected with bluez) is considered to be a system battery by acpi.

Most likely, the vast drop in battery lifetime comes from something else (to be found out).

Sorry for the disturbance...

(marked SOLVED)

Last edited by romero (2020-12-15 02:37:23)


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