Public bug reported: [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, check the ABS event type. There should be ABS_PRESSURE and ABS_MT_PRESSURE event. 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 ** Affects: libinput (Ubuntu) Importance: Undecided Status: New ** Description changed: [Impact] - * ALPS new i2c touchpads has 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. + * 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 with vid is 0488, and have pressure capabilities. - - The pressure capability can be easily obtain by evtest tool, check the ABS event type. There - should be ABS_PRESSURE and ABS_MT_PRESSURE event. - - 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 + * For touchpad with vid is 0488, and have pressure capabilities. + + The pressure capability can be easily obtain by evtest tool, check the ABS event type. There + should be ABS_PRESSURE and ABS_MT_PRESSURE event. + + 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, most firmware can support firmware labeling palm detection, so it is - okay that the palm detect pressure become less sensitive. + * 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, most 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 + + * The upstream commit has merged + https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/505 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libinput in Ubuntu. https://bugs.launchpad.net/bugs/1897553 Title: Palm detect pressure is too easy to trigger so that the cursor stalled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1897553/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
