Julien was talking to me on IRC, and got me some clarifications:

 - The "invalid bit mask" thing is something else, and nothing to worry
about.

 - In the original bug report, both devices were "present", whereas in
my remote ssh testing they are both "offline". That's because these
devices power down after some minutes of inactivity, which is plausible
because the person owning this device is asleep right now, and I only
have ssh access.

 - You can't read charge levels or much else from powered down devices.
However, that's not the bug here as even in the original report, where
both devices are online, the percentage is 0%

 - Julien only wrote support for the HID 1.0 protocol, but on that
machine they are using HID++ 2.0.

So we are back to the original problem that upower should not claim a 0%
percentage if its actually unable to read the percentage.

Also, it seems that the refactoring patch broke these devices entirely,
but that might also just be fallout from the powered down devices
somehow, and thus I'd rather let Julien test it again on master.

Thanks!

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https://bugs.launchpad.net/bugs/1103064

Title:
  power indicator shows Logitech wireless keyboard and mouse batteries
  with 0%

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