https://bugzilla.kernel.org/show_bug.cgi?id=219638
Bug ID: 219638
Summary: Battery Not Detected on Boot When Running on Battery
Power
Product: ACPI
Version: 2.5
Hardware: Intel
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Power-Battery
Assignee: acpi_power-batt...@kernel-bugs.osdl.org
Reporter: sylvain.mosn...@gmx.fr
Regression: No
On a Samsung Ultra Book 4 running Ubuntu 24.04 with kernel version
6.8.0-51-generic, the battery fails to be detected when the system boots on
battery power. No directory is created under /sys/class/power_supply/BAT1.
However, if the system boots while connected to a power source, the battery is
detected correctly.
Steps to Reproduce:
Power off the laptop.
Disconnect the charger and boot the system on battery power.
Observe that /sys/class/power_supply/BAT1 is missing.
Additional Details:
Running acpidbg shows the battery is correctly handled by ACPI in both
states (on battery or plugged in), suggesting an issue with the kernel's
battery initialization during boot when on battery power.
Expected Behavior: The battery should be detected and
/sys/class/power_supply/BAT1 should be created regardless of whether the system
is booted on battery or connected to a power source.
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