Public bug reported: I port Ubuntu Touch to LG L90 Dual. When I press a button below the screen (it's the touch button and is part of the touch screen), then slide the finger up, a letter will repeatedly appear in any text field selected (for instance, if the button is a menu button, letter 'e' will appear repeatedly). Using evtest with the touch screen device, I can see what happened:
Event: time 75.605520, type 1 (EV_KEY), code 139 (KEY_MENU), value 1 Event: time 75.605525, -------------- EV_SYN ------------ Event: time 75.707065, type 1 (EV_KEY), code 139 (KEY_MENU), value 255 (See the full log here: http://paste.ubuntu.com/15112114/) When I place the finger down, touch screen will send an event with type 1 (EV_KEY), code 139 (KEY_MENU), and value 1, indicating that the button is placed. And when I move the finger away from the button, touch screen will send an event with type 1 (EV_KEY), code 139 (KEY_MENU), and value 255. Digging in kernel code reveals that this is defined as "BUTTON_CANCLED". Looking in libevent code, it seems that it always assume that anything that is not 0 will be considered as pressed, which makes it looks like the button is hold. ** Affects: libinput (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1547864 Title: libevent doesn't handle EV_KEY event with a value of 255 (BUTTON_CANCLED) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1547864/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
