Re: Regression: ACPI battery status incorrectly reported as Not charging after bb1256e0ddc7

[Rafael J. Wysocki (Intel)]

On Sun, Jul 5, 2026 at 11:28 AM golne tree <lrepper@xxxxxxxxxx> wrote:
>
> Dear ACPI maintainers,
>
> I would like to report a regression caused by commit:
>
> bb1256e0ddc7 ("ACPI: battery: fix incorrect charging status when current is zero")
>
> The commit fixes a real issue on Huawei laptops, but it appears to introduce a regression on my system.
>
> Hardware:
>
> Manufacturer: Default string
> Product: Default string
> Laptop: Denver NID-14106SSDDE
> Kernel: 7.0.11-1-cachyos
> The same issue is also present with the unmodified Fedora Workstation kernel.
>
> Observed behavior:
>
> When the AC adapter is connected, the battery is actually charging. The battery percentage increases
>
> However, the kernel reports:
>
> POWER_SUPPLY_STATUS=Not charging
> POWER_SUPPLY_POWER_NOW=0
>
> Relevant values from /sys/class/power_supply/BAT0/uevent:
>
> POWER_SUPPLY_STATUS=Not charging
> POWER_SUPPLY_POWER_NOW=0
> POWER_SUPPLY_VOLTAGE_NOW=7400000
> POWER_SUPPLY_ENERGY_NOW=24760000
> POWER_SUPPLY_CAPACITY=84
>
> The battery does not provide current_now, and DMI information is unfortunately only:
>
> system-manufacturer: Default string
> system-product-name: Default string
>
> Looking at commit bb1256e0ddc7, the following logic was introduced:
>
> if (battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
>     battery->rate_now == 0)
>         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
>
> On my system, rate_now is always reported as zero even while the battery is clearly charging. As a result, userspace always receives Not charging, although the battery level continues to increase.
>
> This suggests that some firmware reports an incorrect rate_now value while still charging, making the new heuristic unsuitable for all systems.
>
> Please let me know if you need additional information (acpidump, DSDT, debug logs, etc.). I would be happy to provide them.
>
> Thank you for your time.

Here's a patch for you to try and let me know if it makes any difference:

https://lore.kernel.org/linux-acpi/6283544.lOV4Wx5bFT@rafael.j.wysocki/

Note that if you don't report back, I have no reason to make any
changes to address this problem.

Thanks!