Opened 5 years ago

Closed 5 years ago

Last modified 21 months ago

#11575 closed defect (fixed)

XO-1.75 kernel audio driver lacks an ALSA Mic Bias control

Reported by: Quozl Owned by: saadia
Priority: normal Milestone:
Component: kernel Version: Development build as of this date
Keywords: Cc:
Blocked By: Blocking:
Deployments affected: Action Needed: no action
Verified: no


Measure locates a Mic Bias control and turns it off for certain operations. The kernel for XO-1.75 lacks a Mic Bias control.

With the Mic Bias on, DC mode input data is offset by the bias voltage.

Change History (5)

comment:1 Changed 5 years ago by saadia

  • Owner set to saadia

comment:2 Changed 5 years ago by saadia

  • Action Needed changed from diagnose to add to build

This has been fixed as of commit b82a7902 in arm-3.0-wip. The Mic BIAS control refers to what is internally known as Mic 1.

comment:3 Changed 5 years ago by martin.langhoff

  • Action Needed changed from add to build to test in build

Please test in OS28

comment:4 Changed 5 years ago by greenfeld

  • Action Needed changed from test in build to no action
  • Resolution set to fixed
  • Status changed from new to closed

There is a Mic bias control in 11.3.1 os28 that has a visible result on the voltage Bias when measured by another XO using Measure in DC mode.

However this does not fix #11602 & #11603, so changing between Resistance and Voltage modes in Measure has no effect as Measure-34 does not seem to be altering the new control.

comment:5 Changed 21 months ago by Quozl

  • Milestone 1.75-software deleted

Milestone 1.75-software deleted

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