Openmoko Bug #1267: Strong echo when calling a Neo from another phone

Openmoko Public Trac bugs at
Wed Oct 8 23:20:44 CEST 2008

#1267: Strong echo when calling a Neo from another phone
    Reporter:  mail at  |        Owner:  sean_chiang
        Type:  defect             |       Status:  assigned   
    Priority:  high               |    Milestone:             
   Component:  Audio              |      Version:  unspecified
    Severity:  normal             |   Resolution:             
    Keywords:  audio, echo        |    Blockedby:             
Reproducible:                     |     Blocking:             

Comment(by michael):

 Daniel Nöthen reports, and Angus Ainslie confirms, a pattern which might
 debug this issue. Full email at:


 1. Boot the freerunner
 2. Make a call -> no echo
 3. Hang up
 4. Make a call -> echo
 5. Hang up
 6. /etc/init.d/xserver-nodm restart
 7. Make a call -> no echo
 8. Hang up
 9. Make a call -> echo

 With the above state file I was able to bring up the "Speaker" volume up
 without hearing any echo on step 2 and 7.
 The volumes on both sides were very good.
 On step 4 and 9 I could only bring up the "Speaker" volume to 79%.
 Above 79% the echo came back.

 So it seems that the echo suppression command (AT%N0187) gets reset after
 every call.

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