Bug 49966

Summary: Coasting Direction is incorrect for negative VertScrollDelta/HorizScrollDelta
Product: xorg Reporter: Chun Yang <Chuck.Yang>
Component: Input/synapticsAssignee: Peter Hutterer <peter.hutterer>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Patch to fix wrong coasting direction none

Description Chun Yang 2012-05-15 13:03:02 UTC 
Overview:
Coasting is in the wrong direction for negative VertScrollDelta/HorizScrollDelta.

Steps to Reproduce:
1) Set VertScrollDelta to -25 in xorg.conf (Option "VertScrollDelta" "-25") or via synclient (`synclient VertScrollDelta=-25`).
2) Enable coasting (try CoastingSpeed=20, CoastingFriction=10)
2) Scroll down a long webpage and try to activate coasting

Actual Results:
Scrolling temporarily stops after releasing fingers from touchpad, then scrolls in reverse direction before stopping.

Expected Results:
Scrolling coasts in the same direction as original scroll for a while and eventually slows and stops.

Build Operating System: Linux 3.3.2-1-ARCH x86_64
Build Date: 15 April 2012  09:55:35AM
Comment 1 Chun Yang 2012-05-15 13:11:51 UTC 
Created attachment 61691 [details] [review]
Patch to fix wrong coasting direction
Comment 2 Peter Hutterer 2012-05-15 18:48:08 UTC 
thanks, pushed.

commit 53557a5cab1e253dc8f4393207954ae0fe76068f
Author: Chun Yang <Chuck.Yang@gmail.com>
Date:   Tue May 15 14:51:42 2012 -0500

    Fix coasting for negative ScrollDelta

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