Thanks for offering to help! The 43F5 digitizer is another revision of
the same touchscreen, so this is very likely the same bug. Before you
install anything, could you run these four commands in a terminal and
paste the output here?

  cat /sys/class/dmi/id/board_name /sys/class/dmi/id/bios_version
  grep ELAN /proc/interrupts; sleep 1; grep ELAN /proc/interrupts
  mokutil --sb-state
  uname -r

(Keep your hands off the touchscreen while the second line runs.)

What I am looking for: if the ELAN number in the second command jumps
by several hundred within that one second, you have the same bug. The
third line tells us whether Secure Boot is enabled, which decides which
fix you can use. With Secure Boot off, there is a tool you can install
in a few minutes; with Secure Boot on, the kernel fix is the way, and
yes, once it is accepted upstream it will arrive in Kubuntu's normal
kernel updates.

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https://bugs.launchpad.net/bugs/2142384

Title:
  ELAN2514:00 (04F3:4428) stylus report rate extremely low (~10–25 Hz)
  on Ubuntu 24.04 kernel 6.17

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