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3c7e3a1973
400 used to be the default DPI for many mice but it it's not anymore. A survey of mice shows that 400 is still common as one of the pre-configured settings in switchable multi-resolution gaming mice, but devices with a single resolution mostly favor 1000 dpi. Let's make that switch now so that any future changes to the pointer acceleration code assumes that resolution as a default. For the touchpad, this has a bad side-effect, caused by our expectation of mouse vs touchpad behaviours: our acceleration code ignores device type and provides the same acceleration for the same physical movement. Unfortunately, we expect touchpads to be significantly slower than mice. The previous 400 DPI worked because it caused an acceptable slowdown on input. e.g. on the T440 with a res of 42 units/mm, the scale coefficient was 0.37. For 1000 DPI as default, this now results in 0.94, i.e. speeding up the touchpad by a factor of 2.5. That is way too fast. Adding touchpad-specific filter code is a bigger project, so let's just add a fixme for now and scale the coefficient back to what it was before the DPI default change. Effect: touchpad behaves as before. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com> |
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libinput libinput is a library that handles input devices for display servers and other applications that need to directly deal with input devices. It provides device detection, device handling, input device event processing 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 pointer events from touchpads, pointer acceleration, etc. libinput originates from weston, the Wayland reference compositor. The source code of libinput can be found at: http://cgit.freedesktop.org/wayland/libinput For more information, visit: http://www.freedesktop.org/wiki/Software/libinput/