[Bug 220722] Non existent battery reporting for a laptop with touchscreen MSI

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220722

--- Comment #12 from ggrundik@gmail.com ---
Isn't this a GNOME problem, not a kernel one?

Current PCs can have quite a lot of battery-powered devices, apart of PC
itself: wireless controllers, mices, keyboards, pens, VR headsets, headphones,
etc. Most of them can report their battery status. If a desktop environment
cant separate them apart, and dont understand which is PC itself and which is
not... Its clearly fault of desktop environment, since its quite a common case.
KDE, for example, has no problems with that. This bug should be reported in
GNOME, not in kernel.

Blocking some device metrics in a kernel, just because some specific userspace
program incorrectly handles that in a weird way does not seems like a wise
solution. It is a perfectly functional, correct and useful metric.

This touchscreen is has two sensor layers: one for fingers plus one for stylus,
and it does report battery status of stylus. Communications between stylus and
the drawing surface can happen only when stylus is in range of touchscreen, its
a hardware limitation. So touchscreen does not have any information about
stylus until this communication happens at least once, but this does not means
that there are no stylus at all, or it is never in use. But after this
communication happens, touchscreen remembers last known status, and its
correctly shown as a battery level.

Before this change was made, this touchscreen was working as good as hardware
could. Now there are no pen battery status not only in GNOME, but nowhere.

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