Ticket #11575 (closed defect: fixed)

Opened 3 years ago

Last modified 3 years ago

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

Reported by: Quozl Owned by: saadia
Priority: normal Milestone: 1.75-software
Component: kernel Version: Development build as of this date
Keywords: Cc:
Action Needed: no action Verified: no
Deployments affected: Blocked By:


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

Changed 3 years ago by saadia

  • owner set to saadia

Changed 3 years ago by saadia

  • next_action 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.

Changed 3 years ago by martin.langhoff

  • next_action changed from add to build to test in build

Please test in OS28

Changed 3 years ago by greenfeld

  • status changed from new to closed
  • next_action changed from test in build to no action
  • resolution set to fixed

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.

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