Opened 10 years ago

Closed 10 years ago

Last modified 20 months ago

#541 closed defect (fixed)

Internal microphone not working

Reported by: Nat Owned by: wad
Priority: high Milestone:
Component: hardware Version:
Keywords: relnote Cc:
Blocked By: Blocking:
Deployments affected: Action Needed:
Verified: no


On build 193 I can't seem to make the built-in microphone work.
In alsamixer, I can choose between mic1 and mic2. mic1 works fine when I plug an external microphone, but the internal microphone doesn't seem to work wether I'm set on mic1 or mic2.

Change History (8)

comment:1 Changed 10 years ago by mfoster

  • Status changed from new to assigned

comment:2 Changed 10 years ago by Nat

It appears that both the internal and external microphone are linked to the mic1 entry in alsamixer, however, there is a huge hum (ground loop ?) when using the internal microphone. If I tap on the microphone with a finger I can hear it using headphones, but it doesn't work at all in TamTam when I try to record.

comment:3 Changed 10 years ago by mfoster

This is a fundamental I.D. problem, which places the mic too close to the right speaker, and causes feedback. If you disable the right speaker, the microphone works well. We will attempt to relocate the mic either for the B2 or B3 builds.

comment:4 in reply to: ↑ description Changed 10 years ago by Jason Liu

Replying to Nat:

Regarding the internal microphone can't work well issue ,We find the internal microphone cable was reversed ,

so we need swap the two wire cable .
The AC'97Codec mic1 for internal and external microphone input .


comment:5 Changed 10 years ago by jg

  • Keywords relnote added
  • Owner changed from mfoster to wad
  • Status changed from assigned to new

Need to get in the release notes.

Need to verify the cabling is fixed in B3.

Also, IIRC, the default ALSA settings are wrong, causing feedback.

comment:6 Changed 10 years ago by jg

  • Milestone changed from BTest-2 to BTest-3

Investigated carefully. One vendor's mike is bad, and there are bias problem.

comment:7 Changed 10 years ago by wad

  • Resolution set to fixed
  • Status changed from new to closed
  • Verified unset

Significant changes have been made between the filing of this bug and the B3 build, including moving the microphone and providing it with a nice short, shielded cable.

This bug is closed, to allow newer, more relevant microphone bugs to be logged separately.

comment:8 Changed 20 months ago by Quozl

  • Milestone BTest-4 deleted

Milestone BTest-4 deleted

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