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4e60b4f830
The microphone input on the back panel (pink connector) stopped operating correctly after an upgrade from 2.6.35 to 2.6.38; the actual problem manifests itself as a lack of microphone bias voltage (VREF_HIZ) on node 0x17. With AD1988_6STACK_DIG the maximum bias voltage (VREF_80) is applied and the headset operates correctly. Signed-off-by: Tony Vroon <tony@linx.net> Tested-by: Doug Redlich <pbrigade@nxltech.net> Signed-off-by: Takashi Iwai <tiwai@suse.de>