Created attachment 145820 [details]
KDE Bluetooth - apple magic keyboard's names

SUMMARY

Either this product/component or it should go into powerdevil/frameworks-solid/bluedevil.

Apple Magic Keyboard is a Bluetooth-only device, and after pairing with a Linux system (either desktop or Android) it can be renamed in system/Bluetooth settings. Such renaming apparently only affects the operating system; while the device continues to identify itself as before (in my case it's supposedly the name of its previous owner -- I got a second-hand keyboard after all). It is said[1] that it can only be truly renamed from an OS X system, which I currently don't have at my disposal.

Both names may be visible on screen at the same time e.g. if you expand the list item in a Bluetooth applet, or just request info from `bluetoothctl`:

❯ bluetoothctl info 90:**:**:**:**:CD
Device 90:**:**:**:**:CD (public)
        Name: denis - клавиатура
        Alias: tragic keyboard
        Class: 0x00002540
        Icon: input-keyboard
        Paired: yes
        Trusted: yes
        Blocked: no
        Connected: yes
        WakeAllowed: yes
        LegacyPairing: no
        UUID: Human Interface Device... (00001124-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        Modalias: usb:v05ACp0239d0050

The problem is that «Battery and Brightness» applet always displays the "Name" field, not a given "Alias". In the "powermanagement" Plasma data engine there are three naming fields per battery:
- Vendor
- Product
- Pretty Name

For instance, my laptop's battery is represented as

> { Vendor: "ASUSTeK", Product: "ASUS Battery", "Pretty Name": "Battery" }

but the poor tragic keyboard has both Product and Pretty Name equal to the same "device's remote name", even without vendor:

> { Vendor: <empty>, Product: "denis - клавиатура", "Pretty Name": "denis - клавиатура" }

On a closer look into kernel objects at /sys/bus/usb/devices/... it seems that the name is coming from HID_NAME in uevent data. Vendor data could've been extracted from HID_ID (like USB VID), but it's just not happening. AFAICT there's no API to directly tell HID device to change its name, which is probably why the system is resorting to "local" aliases.

STEPS TO REPRODUCE
1. Pair Appleⓡ Magic Keyboard™ with your system.
2. Rename it in System Settings.
3. Open up «Battery and Brightness» applet.

OBSERVED RESULT
You are seeing the "old" name, the HID name of a device.

EXPECTED RESULT
Since a proper renaming of this keyboard is not possible anywhere except on OS X, I'd at least expected to see an alias name in the applet.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel Version: 5.16.2-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970M/PCIe/SSE2

bluez: 5.63-1
bluedevil: 1:5.23.5-1

ADDITIONAL INFORMATION

[1]: https://discussions.apple.com/thread/250109852