It's not a kernel bug. Multitouch works under Wayland but not under
Xorg.
The multitouch can work with libinput:
Section "InputClass"
Identifier "Wacom USB touchscreen class"
MatchUSBID "056a:490a"
MatchDevicePath "/dev/input/event*"
MatchIsTouchscreen "true"
Driver "libinput"
EndSection
So we may need to change 70-wacom.conf.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Also affects: xf86-input-wacom (Ubuntu)
Importance: Undecided
Status: New
** Also affects: xserver-xorg-input-libinput (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xf86-input-wacom in Ubuntu.
https://bugs.launchpad.net/bugs/1823581
Title:
Multi-touch screen test of checkbox failed on Disco 19.04
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