Bug 477726

Summary:	Synaptics kernel driver exports wrong multifinger option
Product:	[Fedora] Fedora	Reporter:	Peter Hutterer <peter.hutterer>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	low
Version:	10	CC:	kernel-maint
Target Milestone:	---
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Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2009-07-31 00:09:50 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Peter Hutterer 2008-12-23 04:09:39 UTC

Description of problem:
The synaptics driver exports the wrong multifinger option for some devices. 

The multifinger support is hardcoded without checking the hardware first and all touchpads thus announce capabilities for two-finger or three-finger touch. The xorg-x11-drv-synaptics driver (version 1.0) relies on the multifinger capabilities to set up two-finger or edge scrolling. If the information is wrong, the driver will setup two-finger scrolling only - even though the touchpad can't actually do it. As a result, scrolling is broken.

This bug has been in the kernel since at least the import into git.  
A patch has been provided: http://lkml.org/lkml/2008/11/19/376
The patch was in -mm and is now in linux-next. It'd be good if we can pull this patch into F10 and rawhide to allow the upgrade to xorg-x11-drv-synaptics 1.0 when it comes out.

Version-Release number of selected component (if applicable):
All up to 2.6.27

How reproducible:
Use a Lenovo T61, run evtest against the synaptics device. The synaptics pretends to have multi-finger capabilities even though it can't actually detect multi-finger touches.

Comment 1 Peter Hutterer 2009-07-31 00:09:50 UTC

Works in F11.