File U_man-add-a-warning-that-wheel-emu-inertia-must-be-set-and-it-isn-t-inertia.patch of Package xf86-input-evdev
From: Peter Hutterer <peter.hutterer@who-t.net> Date: Thu Jan 14 11:18:56 2016 +1000 Subject: [PATCH]man: add a warning that wheel emu inertia must be set and it isn't inertia Patch-mainline: Upstream Git-repo: git://anongit.freedesktop.org/git/xorg/driver/xf86-input-evdev Git-commit: ce7d8fdebc0123227be91ba5d89126a36f089ff5 References: FATE#320263 Signed-off-by: Egbert Eich <eich@suse.com> First, it's not actually inertia, it's simply the scroll distance, yay for the misnomer. And it needs to be set for any device that is more fine-grained than a mouse, especially absolute devices. For example the VirtualBox device has an abs max of 32767, so a simple motion may have a delta of to 2000 units and that results in 200 scroll events. That's a bit excessive. Related to: https://bugs.freedesktop.org/show_bug.cgi?id=93617 Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> --- man/evdev.man | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/man/evdev.man b/man/evdev.man index e70ae1f..8d84364 100644 --- a/man/evdev.man +++ b/man/evdev.man @@ -125,6 +125,19 @@ Property: "Evdev Wheel Emulation Button". Specifies how far (in pixels) the pointer must move to generate button press/release events in wheel emulation mode. Default: 10. Property: "Evdev Wheel Emulation Inertia". +.IP +This value must be set for any device does not resemble a standard mouse. +Specifically, on absolute devices such as tablets the value should be set to +a reasonable fraction of the expected movement to avoid excess scroll events. +.IP +.B WARNING: +the name \*qinertia\*q is a misnomer. This option defines the distance +required to generate one scroll event similar to the +.B VertScrollDelta +and +.B HorizScrollDelta +options. It does not enable inertia in the +physical sense, scrolling stops immediately once the movement has stopped. .TP 7 .BI "Option \*qEmulateWheelTimeout\*q \*q" integer \*q Specifies the time in milliseconds the
