Commit a9224f26 authored by Cássio Gabriel's avatar Cássio Gabriel Committed by Takashi Iwai
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ALSA: usb-audio: Fix Audio Advantage Micro II SPDIF switch 



snd_microii_spdif_switch_put() returns 0 when the requested
vendor register value differs from the cached one.

This comparison was inverted by the resume-support conversion,
so real SPDIF switch toggles are ignored while no-op writes still
issue SET_CUR and report success.

Return early only when the requested value matches the cached one.

Fixes: 288673be ("ALSA: usb-audio: Add resume support for MicroII SPDIF ctls")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarCássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260421-microii-spdif-switch-fix-v1-1-5c50dc28b88f@gmail.com


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent fca9c850

sound/usb/mixer_quirks.c

+1 −1
Original line number Diff line number Diff line
@@ -2027,7 +2027,7 @@ static int snd_microii_spdif_switch_put(struct snd_kcontrol *kcontrol, 
	int err;



	reg = ucontrol->value.integer.value[0] ? 0x28 : 0x2a;

	if (reg != list->kctl->private_value)

	if (reg == list->kctl->private_value)

		return 0;



	kcontrol->private_value = reg;