Re: [PATCH] ACPI: battery: Fix bogus cycle count values on systems without _BIX

[Rafael J. Wysocki (Intel)]

On Tue, Sep 1, 2026 at 10:18 PM Armin Wolf <W_Armin@xxxxxx> wrote:
>
> Am 01.09.26 um 22:16 schrieb Rafael J. Wysocki (Intel):
>
> > On Tue, Sep 1, 2026 at 10:11 PM Armin Wolf <W_Armin@xxxxxx> wrote:
> >> Am 07.08.26 um 01:38 schrieb Armin Wolf:
> >>
> >>> Devices supporting only the legacy _BIF ACPI control method cannot
> >>> know the cycle count of the associated battery, so cycle_count always
> >>> remains 0. Claiming support for POWER_SUPPLY_PROP_CYCLE_COUNT on
> >>> such devices can thus mislead userspace applications and prevents
> >>> power supply extensions from supplying correct cycle count values.
> >>>
> >>> Fix this by not claiming support for POWER_SUPPLY_PROP_CYCLE_COUNT
> >>> on devices without _BIX.
> >> Any thoughts on this? I tested it on my device, and so far everything seems
> >> to work flawlessly.
> > It looks good overall, but it is quite substantial, which is why it
> > didn't make it into 7.3-rc1.
> >
> > I'm planning to apply it for 7.4.
>
> Alright, that works for me.

And so applied.

Sashiko has a comment on the _BIX failing case:

https://sashiko.dev/#/patchset/20260806233817.622975-1-W_Armin%40gmx.de

but this can be addressed on top of the current patch IMV.

If you think that it's worth addressing, please send a follow-up one for that.

Thanks!