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[0/4] Improvements to ACPI battery handling over s2idle

Message ID 20250208162210.3929473-1-superm1@kernel.org
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Series Improvements to ACPI battery handling over s2idle | expand

Message

Mario Limonciello Feb. 8, 2025, 4:22 p.m. UTC 
From: Mario Limonciello <mario.limonciello@amd.com>

On Windows the system wakes up when connected or disconnected from an
AC adapter. On Linux the system will momentarily wake up but immediately
go back into suspend.

This difference in behavior can potentially expose lower level platform
firmware bugs. For example entering/exiting HW sleep rapidly might not
work properly [1]. It's also inconsistent in that plugging in a dock
might not wake up a system when it should.

This series most notably adjusts that behavior. It also adds a new sysfs
file to determine how much battery was lost over the last sleep cycle
which could aid in userspace statistics and in debugging high power
consumption over s2idle.

[1] https://gitlab.freedesktop.org/drm/amd/-/issues/3929

Mario Limonciello (4):
  PM: Add sysfs file for energy consumed over sleep cycle
  ACPI: battery: Save and report battery capacity over suspend
  ACPI: battery: Refactor wakeup reasons in acpi_battery_update()
  ACPI: battery: Wake system on AC plug or unplug in over s2idle

 Documentation/ABI/testing/sysfs-power |  8 ++++
 drivers/acpi/battery.c                | 62 ++++++++++++++++++++++-----
 include/linux/suspend.h               |  2 +
 kernel/power/main.c                   | 10 +++++
 4 files changed, 71 insertions(+), 11 deletions(-)