[Bug 1897553] Re: [ALPS i2c Touchpads] Palm detect pressure is too easy to trigger so that the cursor stalled

[Timo Aaltonen]

Hello Kai-Chuan, or anyone else affected,

Accepted libinput into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/libinput/1.15.5-1ubuntu0.1 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1897553

Title:
  [ALPS i2c Touchpads] Palm detect pressure is too easy to trigger so
  that the cursor stalled

Status in OEM Priority Project:
  New
Status in libinput package in Ubuntu:
  Fix Released
Status in libinput source package in Focal:
  Fix Committed

Bug description:
  [Impact]

   * ALPS new i2c touchpads have capabilities for reporting ABS_PRESSURE and
     ABS_MT_PRESSURE event, However, it is very easy to over the default
     palm detect by pressure threshold 130. When the threshold is achieved,
     the cursor will be stalled, and not be able to keep following the
     finger's movement.

  [Test Case]

   * For touchpad vid 0488, and have pressure capabilities.

     The pressure capability can be easily obtain by evtest tool, there 
     should be ABS_PRESSURE and ABS_MT_PRESSURE event in ABS event type.

     Test step:
     Install libinput-tools
     1. $ sudo apt install libinput-tools
     2. $ sudo libinput measure touchpad-pressure
     3. Generally move the finger, the pressure max should not exceed the
        palm pressure detect threshold

  [Regression Potential]

   * It only impacts ALPS i2c models
   * It won't impact the touchpad without capability to report pressure event.
   * For those touchpad with pressure capability will make the palm detect 
     pressure be less sensitive. However, ALPS said its firmware can support 
     firmware labeling palm detection, so it is okay that the palm detect 
     pressure become less sensitive.

  [Other Info]

   * The upstream commit has merged
     https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/505

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