#10417 NORM Future : Enable Synaptics mode for CL1A/CL1B/CL1C touchpad

Zarro Boogs per Child bugtracker at laptop.org
Sat Nov 12 12:14:27 EST 2011

#10417: Enable Synaptics mode for CL1A/CL1B/CL1C touchpad
           Reporter:  martin.langhoff  |       Owner:  cjb           
               Type:  enhancement      |      Status:  new           
           Priority:  normal           |   Milestone:  Future Release
          Component:  distro           |     Version:  not specified 
         Resolution:                   |    Keywords:                
        Next_action:  never set        |    Verified:  0             
Deployment_affected:                   |   Blockedby:                
           Blocking:                   |  

Comment(by dsd):

 Synaptics confirmed that Relative mode is more appropriate for us - as an
 embedded system we want to avoid such a heavy stream of data.

 Patches have been accepted into the upstream kernel that add a
 "SynRelPS/2" protocol as part of the synaptics driver. This puts the mouse
 in relative mode but exposes the hardware tap-to-click control (which
 defaults to tap-to-click disabled in hardware, like it does in absolute
 mode). This is being handled in #11383 (for 12.1.0).

 As noted in #8901 the sensitivity issue with Synaptics mode is because the
 driver reports packets while the finger is close to the pad. Old versions
 of xf86-input-evdev were interpreting these as mouse movements; this
 caused dilinger to disable the mode at the kernel level for OLPC. However,
 the xf86-input-evdev version included in F16 fixes this as it ignores
 evdev events from the kernel which do not state that the finger is on the

 The EC bug (in that it falls to its knees in the presence of the synaptics
 absolute mode packet flood) is still present and can continue to be
 diagnosed on this ticket and in #8901.

Ticket URL: <http://dev.laptop.org/ticket/10417#comment:22>
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