Openmoko Bug #1194: Touchscreen Jitter

Openmoko Public Trac bugs at
Sat Nov 29 05:32:25 CET 2008

#1194: Touchscreen Jitter
    Reporter:  mickey@…             |        Owner:  openmoko-kernel
        Type:  defect               |       Status:  in_testing     
    Priority:  high                 |    Milestone:                 
   Component:  System Software      |      Version:  unspecified    
    Severity:  normal               |   Resolution:                 
    Keywords:                       |     Haspatch:  0              
   Blockedby:                       |    Estimated:                 
 Patchreview:                       |     Blocking:                 
Reproducible:                       |  

Comment(by safire):

 Replying to [comment:21 arhuaco]:
 > > I will update this ticket as soon as I'm done to see if it also helps.
 > Mmm. The filter is ready. It helps ignoring the last point.

 I tested the "skip" filter, but *not* with any modified kernel.

 What I find is that the combination of the lowpass and the skip filters
 makes for a nice click input event and stable hold.  I agree that using
 nhead=1 is better than 0.

 Here's my ts.conf:

 module_raw input
 module pthres pmin=1
 module skip nhead=1 ntail=1
 module variance delta=30
 module dejitter delta=100
 module lowpass
 module linear

 Haven't been playing with different kernels with Debian yet...not sure the
 compatibility there.

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