#11550 NORM 11.3.1: XO-1.5 finger rolling on touchpad causes cursor position jumps

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#11550: XO-1.5 finger rolling on touchpad causes cursor position jumps
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           Reporter:  martin.langhoff  |       Owner:  reuben                                 
               Type:  defect           |      Status:  new                                    
           Priority:  normal           |   Milestone:  11.3.1                                 
          Component:  hardware         |     Version:  1.5/1.0 Software Build os860 aka 10.1.3
         Resolution:                   |    Keywords:                                         
        Next_action:  diagnose         |    Verified:  0                                      
Deployment_affected:                   |   Blockedby:                                         
           Blocking:                   |  
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Comment(by avatar):

 Replying to [comment:15 sridhar]:
 > avatar, please explain how to set the boot parameter. I can't find any
 info on this anywhere.

 Use ctrl-alt-f2 to switch to text mode and press ENTER to login as root.
 Then edit /bootpart/boot/olpc.fth and replace the following line(should be
 close to the end of this file):

 {{{
    \ " extra kernel parameters here" to boot-file
 }}}

 with:
 {{{
   " olpc_keyboard.debug=1 log_buf_len=2M " to boot-file
 }}}

 Next time you reboot with the updated olpc.fth, dmesg should include
 verbose olpc_kbd_pad_{write,rx} messages such like:
 {{{
 .
 .
 .
 [    8.553676] olpc_keyboard: olpc_kbd_pad_write which=100 val=f5
 [    8.555976] olpc_keyboard: olpc_input_rx 1fa
 [    8.556038] olpc_keyboard: olpc_kbd_pad_write which=100 val=f3
 [    8.558328] olpc_keyboard: olpc_input_rx 1fa
 [    8.558346] olpc_keyboard: olpc_kbd_pad_write which=100 val=66
 [    8.560695] olpc_keyboard: olpc_input_rx 1fe
 [    8.560711] olpc_keyboard: olpc_kbd_pad_write which=100 val=88
 [    8.562960] olpc_keyboard: olpc_input_rx 1fc
 [    8.563047] olpc_keyboard: olpc_kbd_pad_write which=100 val=f3
 [    8.564895] olpc_keyboard: olpc_input_rx 1fa
 .
 .
 .
 }}}

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Ticket URL: <http://dev.laptop.org/ticket/11550#comment:16>
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