Public bug reported:
Although many laptops and netbooks don't support _BTP, it is probably
worth implementing a _BTP sanity check to test that battery trip points
work. The ACPI user space interface exists in
/proc/acpi/battery/*/alarm
Conceptually:
Set alarm to a level just below current level, unplug AC adapter, soak
CPUs to drain battery, watch for battery event when we drop below the
trip point.
See: 10.2.2.7 _BTP (Battery Trip Point) of ACPI specification.
Tests: Does _BTP exist? If so, can we set it? Does it generate an event?
Can we cancel it by writing a zero to the /proc interface?
** Affects: fwts (Ubuntu)
Importance: Wishlist
Status: New
** Changed in: fwts (Ubuntu)
Importance: Undecided => Low
** Changed in: fwts (Ubuntu)
Importance: Low => Wishlist
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https://bugs.launchpad.net/bugs/853875
Title:
fwts: battery test should sanity check _BTP via
/proc/acpi/battery/*/alarm
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