Re: [PATCH] platform/x86: asus-wmi: do not enforce a battery charge threshold

["Derek J. Clark" <derekjohn.clark@gmail.com>]

On March 4, 2026 5:26:08 AM PST, Denis Benato <denis.benato@linux.dev> wrote:
>Users are complaining for the battery limit being reset at 100% during
>the boot process while the general consensus appears to not apply
>unsolecited hardware changes, therefore stop resetting the battery
>charge limit at boot and return -ENODATA on charge_end_threshold to
>signal for an unknown limit.
>
>Suggested-by: Antheas Kapenekakis <lkml@antheas.dev>
>Suggested-by: Derek J. Clark <derekjohn.clark@gmail.com>
>Signed-off-by: Denis Benato <denis.benato@linux.dev>

Hi Denis,

LGTM.

Reviewed-by: Derek J. Clark <derekjohn.clark@gmail.com>

- Derek
>---
> drivers/platform/x86/asus-wmi.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
>index 6ba49bd375df..dc330a8ee2f2 100644
>--- a/drivers/platform/x86/asus-wmi.c
>+++ b/drivers/platform/x86/asus-wmi.c
>@@ -1557,7 +1557,10 @@ static ssize_t charge_control_end_threshold_show(struct device *device,
> 						 struct device_attribute *attr,
> 						 char *buf)
> {
>-	return sysfs_emit(buf, "%d\n", charge_end_threshold);
>+	if ((charge_end_threshold >= 0) && (charge_end_threshold <= 100))
>+		return sysfs_emit(buf, "%d\n", charge_end_threshold);
>+
>+	return -ENODATA;
> }
> 
> static DEVICE_ATTR_RW(charge_control_end_threshold);
>@@ -1580,11 +1583,11 @@ static int asus_wmi_battery_add(struct power_supply *battery, struct acpi_batter
> 		return -ENODEV;
> 
> 	/* The charge threshold is only reset when the system is power cycled,
>-	 * and we can't get the current threshold so let set it to 100% when
>-	 * a battery is added.
>+	 * and we can't read the current threshold, however the majority of
>+	 * platforms retains it, therefore signal the threshold as unknown
>+	 * until user explicitly sets it to a new value.
> 	 */
>-	asus_wmi_set_devstate(ASUS_WMI_DEVID_RSOC, 100, NULL);
>-	charge_end_threshold = 100;
>+	charge_end_threshold = -1;
> 
> 	return 0;
> }