[Bug 215799] apple-mfi-fastcharge causes automatic pm hibernation entry, when iPhone gets attached

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215799

Manuel Ullmann (labre@posteo.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #4 from Manuel Ullmann (labre@posteo.de) ---
(In reply to Oliver Neukum from comment #2)
> Working theory:
> 
> You are misinterpreting the system's reaction. The hibernation is not done
> automatically by the kernel. Instead the kernel reports a charger as a
> battery. That battery, being a charger, reports a charge of zero. User space
> monitors this and does as it should if its only known power source is a
> battery at zero charge: it hibernates the system.

Your theory is correct. The laptop-mode-tools auto-hibernation facility causes
the hibernation. This happens even with the patch, because laptop-mode-tools
fails to check, whether a battery has battery-like nodes or whether there are
just chargers in /sys/class/power_supply. [1]

> Please test this patch

Thank you for looking into this and for the patch. laptop-mode-tools is in
Bash, so I can send the PR myself. It would be nice, if it could be backported,
since it fixes a bug, but laptop-mode-tools could also use a better check for
battery nodes.

[1]:
https://github.com/rickysarraf/laptop-mode-tools/blob/25496b668d597f947a7d65e7c2d4712e8f77692e/usr/sbin/laptop_mode#L486

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