Public bug reported:
Steps:
1) install Ubuntu 12.04 LTS
2) dump asl from the system to confirm _BIX is not presented and thus battery
trip point is not supported.
3) cat /proc/acpi/battery/BAT*/alarm (or /sys/class/power_supply/BAT*/alarm)
4) return "unsupported" (or 0)
5) write a value to /proc/acpi/battery/BAT*/alarm (or
/sys/class/power_supply/BAT*/alarm)
6) cat /proc/acpi/battery/BAT*/alarm (or /sys/class/power_supply/BAT*/alarm)
Expected result: "alarm" stays as "unsupported" (or 0)
Actual result: "alarm" returns the written value
** Affects: linux (Ubuntu)
Importance: Medium
Status: In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1001885
Title:
battery trip point (alarm) can be updated when it is not supported by
firmware
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