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On Dell i2c touchpads, the controller appears to go to sleep after about 1s of inactivity on the touchpad. The wakeup takes a while so on the next touch, we may see a pointer jump, specifially on the third event (i.e. touch down, event, event+jump). The MSC_TIMESTAMP value carries a hint for what's happening here, the event sequence for a touchpad with scanout intervals 7300µs is: ... MSC_TIMESTAMP 0 SYN_REPORT ... MSC_TIMESTAMP 7300 SYN_REPORT +2ms ... MSC_TIMESTAMP 123456 SYN_REPORT +7ms ... MSC_TIMESTAMP 123456+7300 SYN_REPORT +8ms Note how the SYN_REPORT timestamps don't reflect the MSC_TIMESTAMPS. This patch adds a quirk activate MSC_TIMESTAMP watching. When we do so, we monitor for a 0 MSC_TIMESTAMP. Let's assume that the first event after that is the interval, then check the third event. If that third event's timestamp is too large rewrite the touches' motion history to reflect the correct timestamps, i.e. instead of the SYN_REPORT timestamps the motion history now uses "third-event SYN_REPORT timestamps minus MSC_TIMESTAMP values". The pointer accel filter code uses absolute timestamps (#123) so we have to restart the pointer acceleration filter when we detect this jump. This allows us to reset the 0 time for the filter to the previous event's MSC_TIMESTAMP time, so that our new large delta has the correct time delta too. This calculates the acceleration correctly for that window. The result is that the pointer is still delayed by the wake-up window (not fixable in libinput) but at least it ends up where it should've. There are a few side-effects: thumb, gesture, and hysteresis all still use the unmodified SYN_REPORT time. There is a potential for false detection of either of these now, but we'll have to fix those as they come up. Fixes #36 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> |
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libinput
libinput is a library that provides a full input stack for display servers and other applications that need to handle input devices provided by the kernel.
libinput provides device detection, event handling and abstraction so minimize the amount of custom input code the user of libinput need to provide the common set of functionality that users expect. Input event processing includes scaling touch coordinates, generating relative pointer events from touchpads, pointer acceleration, etc.
User documentation
Documentation explaining features available in libinput is available here.
This includes the FAQ and the instructions on reporting bugs.
Source code
The source code of libinput can be found at: https://gitlab.freedesktop.org/libinput/libinput
For a list of current and past releases visit: https://www.freedesktop.org/wiki/Software/libinput/
Build instructions: https://wayland.freedesktop.org/libinput/doc/latest/building_libinput.html
Reporting Bugs
Bugs can be filed on freedesktop.org GitLab: https://gitlab.freedesktop.org/libinput/libinput/issues/
Where possible, please provide the libinput record output
of the input device and/or the event sequence in question.
See https://wayland.freedesktop.org/libinput/doc/latest/reporting-bugs.html for more info.
Documentation
- Developer API documentation: https://wayland.freedesktop.org/libinput/doc/latest/modules.html
- High-level documentation about libinput's features: https://wayland.freedesktop.org/libinput/doc/latest/pages.html
- Build instructions: https://wayland.freedesktop.org/libinput/doc/latest/building_libinput.html
- Documentation for previous versions of libinput: https://wayland.freedesktop.org/libinput/doc/
Examples of how to use libinput are the debugging tools in the libinput repository. Developers are encouraged to look at those tools for a real-world (yet simple) example on how to use libinput.
- A commandline debugging tool: https://gitlab.freedesktop.org/libinput/libinput/tree/master/tools/libinput-debug-events.c
- A GTK application that draws cursor/touch/tablet positions: https://gitlab.freedesktop.org/libinput/libinput/tree/master/tools/libinput-debug-gui.c
License
libinput is licensed under the MIT license.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: [...]
See the COPYING file for the full license information.
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