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I have the Wacom Intuos Pro (model PTH660). I plugged it into a USB port and it immediately worked. The stylus selects any UI element and I can draw in Gimp, Krita, etc., with pressure sensitivity using the stylus. Touch input also works. So that's a good start. However, the tablet to screen aspect ratios need to be fixed, and I want to assign suitable actions to the various buttons.
My first step was to install xf86-input-wacom and kcm-wacomtablet. (I'm running KDE.) However, after installing those packages and rebooting, the stylus barely functions. It's hard to say what it is doing because it does a few random things occasionally, but it will no longer draw. Mostly it became non-functional. Interestingly, touch input continues to work correctly.
I tried adjusting all the various settings I found in kcm-wacomtablet, but nothing resolved the stylus problems. I uninstalled xf86-input-wacom and kcm-wacomtablet and I'm back to where I started -- a properly working stylus, less the buttons and an aspect ratio that needs to be fixed. I'm running dual monitors.
I am aware of Wacom tablet - ArchWiki https://wiki.archlinux.org/index.php/Wacom_tablet. However, I'm not sure where to start because what I'm experiencing does not seem to be addressed there. Would it be best to move forward without the xf86-input-wacom package? Or, if the package is recommended, any thoughts on why I'm seeing this strange behavior?
$ uname -a
4.17.11-arch1 #1 SMP PREEMPT Sun Jul 29 10:11:16 UTC 2018 x86_64 GNU/Linux
lsusb | grep -i wacom
Bus 001 Device 012: ID 056a:0357 Wacom Co., Ltd PTH-660 [Intuos Pro (M)]
Bus 001 Device 010: ID 056a:509f Wacom Co., Ltd
ls /etc/X11/xorg.conf
ls: cannot access '/etc/X11/xorg.conf': No such file or directory
ls /etc/X11/xorg.conf.d/
total 0
drwxr-xr-x 1 root root 0 Feb 13 2017 .
drwxr-xr-x 1 root root 32 Feb 23 2017 ..
$ dmesg | grep -i wacom
[ 3.281367] usb 1-10: Manufacturer: Wacom Co.,Ltd.
[ 3.284826] input: Wacom Co.,Ltd. Pen and multitouch sensor as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:056A:509F.0006/input/input9
[ 3.284892] hid-generic 0003:056A:509F.0006: input,hiddev2,hidraw5: USB HID v1.11 Device [Wacom Co.,Ltd. Pen and multitouch sensor] on usb-0000:00:14.0-10/input0
[ 3.286490] input: Wacom Co.,Ltd. Pen and multitouch sensor as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:056A:509F.0007/input/input10
[ 3.286524] hid-generic 0003:056A:509F.0007: input,hiddev3,hidraw6: USB HID v1.11 Mouse [Wacom Co.,Ltd. Pen and multitouch sensor] on usb-0000:00:14.0-10/input1
[ 5.533156] input: Wacom Pen and multitouch sensor Finger as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:056A:509F.0006/input/input17
[ 5.535711] wacom 0003:056A:509F.0006: hidraw5: USB HID v1.11 Device [Wacom Co.,Ltd. Pen and multitouch sensor] on usb-0000:00:14.0-10/input0
[ 5.611679] input: Wacom Pen and multitouch sensor Pen as /devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:056A:509F.0007/input/input27
[ 5.611808] wacom 0003:056A:509F.0007: hidraw6: USB HID v1.11 Mouse [Wacom Co.,Ltd. Pen and multitouch sensor] on usb-0000:00:14.0-10/input1
[ 57.792208] usb 1-3: Product: Wacom Intuos Pro M
[ 57.792212] usb 1-3: Manufacturer: Wacom Co.,Ltd.
[ 57.805685] input: Wacom Intuos Pro M Pen as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:056A:0357.000B/input/input31
[ 57.806100] input: Wacom Intuos Pro M Pad as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:056A:0357.000B/input/input33
[ 57.806728] wacom 0003:056A:0357.000B: hidraw7: USB HID v1.10 Mouse [Wacom Co.,Ltd. Wacom Intuos Pro M] on usb-0000:00:14.0-3/input0
[ 57.809541] input: Wacom Intuos Pro M Finger as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2/0003:056A:0357.000C/input/input35
[ 57.809790] wacom 0003:056A:0357.000C: hidraw8: USB HID v1.10 Device [Wacom Co.,Ltd. Wacom Intuos Pro M] on usb-0000:00:14.0-3/input2
[ 58.827721] scsi 0:0:0:0: Direct-Access Wacom Intuos Pro M 1.36 PQ: 0 ANSI: 2
I: Bus=0003 Vendor=056a Product=509f Version=0111
N: Name="Wacom Pen and multitouch sensor Finger"
P: Phys=usb-0000:00:14.0-10/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.0/0003:056A:509F.0006/input/input17
U: Uniq=
H: Handlers=event8 mouse1
B: PROP=2
B: EV=b
B: KEY=400 0 0 0 0 0
B: ABS=260800000000003
I: Bus=0003 Vendor=056a Product=509f Version=0111
N: Name="Wacom Pen and multitouch sensor Pen"
P: Phys=usb-0000:00:14.0-10/input1
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-10/1-10:1.1/0003:056A:509F.0007/input/input27
U: Uniq=
H: Handlers=event22 mouse2
B: PROP=2
B: EV=1b
B: KEY=1e03 0 0 0 0 0
B: ABS=10001000003
B: MSC=1
I: Bus=0003 Vendor=056a Product=0357 Version=0110
N: Name="Wacom Intuos Pro M Pen"
P: Phys=usb-0000:00:14.0-3/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:056A:0357.000B/input/input31
U: Uniq=
H: Handlers=event24 mouse5
B: PROP=1
B: EV=1b
B: KEY=1edf 0 0 0 0 0
B: ABS=1000f000107
B: MSC=1
I: Bus=0003 Vendor=056a Product=0357 Version=0110
N: Name="Wacom Intuos Pro M Pad"
P: Phys=usb-0000:00:14.0-3/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:056A:0357.000B/input/input33
U: Uniq=
H: Handlers=event25 js0
B: PROP=0
B: EV=b
B: KEY=800 1ff 0 0 0 0
B: ABS=10000000103
I: Bus=0003 Vendor=056a Product=0357 Version=0110
N: Name="Wacom Intuos Pro M Finger"
P: Phys=usb-0000:00:14.0-3/input2
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.2/0003:056A:0357.000C/input/input35
U: Uniq=
H: Handlers=event26 mouse6
B: PROP=1
B: EV=2b
B: KEY=e520 0 0 0 0 0
B: ABS=273800000000003
B: SW=4000
ls /usr/share/X11/xorg.conf.d/
total 12
drwxr-xr-x 1 root root 94 Jul 31 23:43 .
drwxr-xr-x 1 root root 96 Mar 5 2017 ..
-rw-r--r-- 1 root root 1350 Jun 18 11:12 10-quirks.conf
-rw-r--r-- 1 root root 945 Jul 11 13:06 40-libinput.conf
-rw-r--r-- 1 root root 1753 Jun 3 06:10 70-synaptics.conf
cat /usr/share/X11/xorg.conf.d/40-libinput.conf
Section "InputClass"
Identifier "libinput tablet catchall"
MatchIsTablet "on"
MatchDevicePath "/dev/input/event*"
Driver "libinput"Offline