Arch Linux

Description:
I have an HP Spectre x360, which comes with a touchscreen and an stylus pen. ACPI detects the touchscreen as a battery. Below you will find:
* the output of acpi command, with two batteries
* the output of upower -d, where you can see the device ELAN0732:00 04F3:22E1 detected as a battery
* the output of xinput, where you can see ELAN0732:00 04F3:22E1 (the touchscreen) and ELAN0732:00 04F3:22E1 Pen (the pen)
* the output of uname -a

Please, let me know if you need further information.

$ acpi -i
Battery 0: Unknown, 0%, rate information unavailable
Battery 1: Charging, 61%, rate information unavailable
Battery 1: design capacity 4832 mAh, last full capacity 4832 mAh = 100%


$ upower -d
Device: /org/freedesktop/UPower/devices/line_power_ADP1
native-path: ADP1
power supply: yes
updated: Sat 03 Mar 2018 10:12:50 AM -03 (576 seconds ago)
has history: no
has statistics: no
line-power
warning-level: none
online: yes
icon-name: 'ac-adapter-symbolic'



Device: /org/freedesktop/UPower/devices/battery_BAT0
native-path: BAT0
vendor: Hewlett-Packard
model: Primary
power supply: yes
updated: Sat 03 Mar 2018 10:20:50 AM -03 (96 seconds ago)
has history: yes
has statistics: yes
battery
present: yes
rechargeable: yes
state: charging
warning-level: none
energy: 23.2848 Wh
energy-empty: 0 Wh
energy-full: 55.8096 Wh
energy-full-design: 55.8096 Wh
energy-rate: 28.512 W
voltage: 12.185 V
time to full: 1.1 hours
percentage: 41%
capacity: 100%
technology: lithium-ion
icon-name: 'battery-good-charging-symbolic'
History (charge):
1520083250 41.000 charging
History (rate):
1520083250 28.512 charging

Device: /org/freedesktop/UPower/devices/keyboard_hid_0018o04F3o22E1x0001_battery
native-path: hid-0018:04F3:22E1.0001-battery
model: ELAN0732:00 04F3:22E1
power supply: no
updated: Sat 03 Mar 2018 10:20:50 AM -03 (96 seconds ago)
has history: yes
has statistics: yes
keyboard
present: yes
rechargeable: yes
state: unknown
warning-level: none
percentage: 0%
icon-name: 'battery-missing-symbolic'

Device: /org/freedesktop/UPower/devices/DisplayDevice
power supply: yes
updated: Sat 03 Mar 2018 10:20:50 AM -03 (96 seconds ago)
has history: no
has statistics: no
battery
present: yes
state: charging
warning-level: none
energy: 23.2848 Wh
energy-full: 55.8096 Wh
energy-rate: 28.512 W
time to full: 1.1 hours
percentage: 41%
icon-name: 'battery-good-charging-symbolic'

Daemon:
daemon-version: 0.99.7
on-battery: no
lid-is-closed: no
lid-is-present: yes
critical-action: HybridSleep


$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ELAN0732:00 04F3:22E1 id=10 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=14 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ HP TrueVision FHD RGB-IR: HP Tr id=9 [slave keyboard (3)]
↳ ELAN0732:00 04F3:22E1 Pen id=11 [slave keyboard (3)]
↳ Intel Virtual Button driver id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
↳ HP Wireless hotkeys id=15 [slave keyboard (3)]
↳ HP WMI hotkeys id=16 [slave keyboard (3)]

$ uname -a
Linux behemoth 4.15.6-1-ARCH #1 SMP PREEMPT Sun Feb 25 12:53:23 UTC 2018 x86_64 GNU/Linux