It seems that some batteries (noticed on DELL JYPJ136) assume capacity_now = design_capacity when fully charged. This causes reported capacity to suddenly jump to >full_charge_capacity (and that means capacity reported to userspace is >100% and incorrect) values after 99%. This patch attempts to detect this bug and trims capacity_now properly. --- diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c index e48fc98..3338dd5 100644 --- a/drivers/acpi/battery.c +++ b/drivers/acpi/battery.c @@ -532,6 +532,14 @@ static int acpi_battery_get_state(struct acpi_battery *battery) " invalid.\n"); } + /* When fully charged, some batteries wrongly report + * capacity_now = design_capacity instead of = full_charge_capacity + */ + if (battery->capacity_now == battery->design_capacity && + battery->full_charge_capacity != ACPI_BATTERY_VALUE_UNKNOWN) + battery->capacity_now = battery->full_charge_capacity; + + if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) && battery->capacity_now >= 0 && battery->capacity_now <= 100) battery->capacity_now = (battery->capacity_now * -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
