kernel patches for exposing HID++ power information through the normal power interfaces are queued for 4.8. See https://patchwork.kernel.org/patch/9204665/ Once this is in it requires a change in upower to drop the userspace handling of unifying devices and instead use the kernel-provided info. Filename is prefixed as hidpp_battery_%d, just in case that matters.
Has this patch been applied?
No, it hasn't. *** This bug has been marked as a duplicate of bug 100359 ***
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