https://bugs.winehq.org/show_bug.cgi?id=29871
--- Comment #50 from Jay Hilliard jaydhilliard@gmail.com --- Woohoo! I think I finally found the cause.
# xsetwacom --list Wacom Intuos Pro M Finger touch id: 13 type: TOUCH Wacom Intuos Pro M Pen stylus id: 14 type: STYLUS Wacom Intuos Pro M Pen eraser id: 15 type: ERASER Wacom Intuos Pro M Pen cursor id: 16 type: CURSOR Wacom Intuos Pro M Pen pad id: 17 type: PAD
# xsetwacom --get 14 all
Hmmm, why does my stylus have a TapTime of 250?
# xsetwacom --set 14 TapTime 0
Now photoshop painting is fluid and pressure sensitivity works. The previously mentioned brush-tip "spacing" option can use default settings now.