https://bugzilla.kernel.org/show_bug.cgi?id=218767
Bug ID: 218767
Summary: Battery trip point default is design capacity of
warning but should be design capacity of low
Product: ACPI
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Power-Battery
Assignee: acpi_power-batt...@kernel-bugs.osdl.org
Reporter: snafu...@gmail.com
Regression: No
The default battery trip point is set to design capacity of warning:
https://github.com/torvalds/linux/blob/9d1ddab261f3e2af7c384dc02238784ce0cf9f98/drivers/acpi/battery.c#L654
There are two issues:
1. ACPI spec says design capacity of warning should trigger OS notification
through the UI. It says nothing about the system doing anything or triggering
sleep, so this value should be irrelevant as far as kernel behaviour is
concerned.
2. Windows ignores design capacity of warning. If Windows ignores it OEMs will
inevitably not test it properly. Source:
https://learn.microsoft.com/en-us/windows-hardware/design/component-guidelines/acpi-battery-and-power-subsystem-firmware-implementation
Setting battery trip point to design capacity of low matches ACPI spec and
aligns to Windows so is more likely properly tested by OEMs.
Supporting point 2 is this note:
https://github.com/torvalds/linux/blob/9d1ddab261f3e2af7c384dc02238784ce0cf9f98/drivers/acpi/battery.c#L509-L510
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