#7788 BLOC 8.2.0 (: Touchpad behavior deteriorates under joyride-2212, joyride-2230

[Zarro Boogs per Child]

#7788: Touchpad behavior deteriorates under joyride-2212, joyride-2230
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   Reporter:  tvoverbeek  |       Owner:  dilinger             
       Type:  defect      |      Status:  new                  
   Priority:  blocker     |   Milestone:  8.2.0 (was Update.2) 
  Component:  kernel      |     Version:  olpc-3               
 Resolution:              |    Keywords:  8.2.0:? blocks?:8.2.0
Next_action:  diagnose    |    Verified:  0                    
  Blockedby:              |    Blocking:                       
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Comment(by tvoverbeek):

 Here are todays (Aug 17) log files. There are again 3 runs on both
 Update.1 (708) and joyride-2302.
 Each run again with 2 log files as yesterday. [[BR]]
 The first run felt pretty good, even on joyride-2302.[[BR]]
 The second run after a battery recharge was pretty lousy. Needed the
 4-finger salute.[[BR]]
 Even the 3rd run was not very good. Even in Update.1 there were jumps.
 Some of them were caught in the dmesg708-3.1.log file: there are regularly
 2 consecutive packets with x=0, y=0 in between 'normal' packets. The
 following 2302 run started very bad. After the 4 finger salute everything
 worked nicely again. The turning on tpdebug made things worse again.[[BR]]

 Especially the last run makes me believe that we have an issue with timing
 between the EC firmware and the driver. In 2203 the packet frequency is
 twice the one in 708. So 2302 is more sensitive to correct timing, which
 would explain the worse initial results in 2302 in the 3rd run.

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Ticket URL: <http://dev.laptop.org/ticket/7788#comment:19>
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