G'day,

I've a mixer control for "Analog Mic Boost" which appears twice in alsamixer --view all, and once in amixer. How do I cause it to appear only once in alsamixer?

amixer shows both Playback and Capture channels for the control:

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Simple mixer control 'Analog Mic Boost',0 Capabilities: volume volume-joined Playback channels: Mono Capture channels: Mono Limits: 0 - 8 Mono: 8 [100%]

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The control is declared with:

/* {0, +20, +24, +30, +35, +40, +44, +50, +52}dB */ static unsigned int mic_bst_tlv[] = { TLV_DB_RANGE_HEAD(7), 0, 0, TLV_DB_SCALE_ITEM(0, 0, 0), 1, 1, TLV_DB_SCALE_ITEM(2000, 0, 0), 2, 2, TLV_DB_SCALE_ITEM(2400, 0, 0), 3, 5, TLV_DB_SCALE_ITEM(3000, 500, 0), 6, 6, TLV_DB_SCALE_ITEM(4400, 0, 0), 7, 7, TLV_DB_SCALE_ITEM(5000, 0, 0), 8, 8, TLV_DB_SCALE_ITEM(5200, 0, 0), };

static const struct snd_kcontrol_new rt5631_snd_controls[] = { ... SOC_SINGLE_TLV("Analog Mic Boost", RT5631_MIC_CTRL_2, RT5631_MIC1_BOOST_SHIFT, 8, 0, mic_bst_tlv), ... }

I'm working on alc5631/rt5631 in a local branch of either 3.0 or 3.5 for the OLPC XO-1.75 and XO-4. But the declaration seems no different in 4.2, apart from the name of the control.

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/sound/s...

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/sound/s...