Red Hat Bugzilla – Bug 477726
Synaptics kernel driver exports wrong multifinger option
Last modified: 2009-07-30 20:09:50 EDT
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
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.
Works in F11.