ALSA: usb-audio: skip the broken mute control on AVerMedia GC553Pro

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Skip the nonfunctional master mute control on the AVerMedia Live Gamer
ULTRA S GC553Pro (07ca:1553).

USB tracing shows that GET_CUR returns zero bytes instead of the required
one-byte value, both through usbfs and during ALSA initialization.
SET_CUR succeeds, but switching capture off does not mute HDMI audio.

Before the change, the driver exposed a misleading PCM Capture Switch
and logged: 3:2: failed to get current value for ch 0 (-22)

With the patch applied, the switch and warning are absent. A ten-second
sound recording through PipeWire confirmed that stereo 48 kHz, 16-bit
capture still works.

Tested on NixOS with the patched 7.3.0-rc3 kernel. The USB audio driver
object builds with Clang and W=1; sparse and strict checkpatch pass.

Signed-off-by: Asai Neko <sugar@sne.moe>
Link: https://patch.msgid.link/20260914-avermedia-gc553pro-alsa-v1-1-4c694e8b0cd5@sne.moe
Signed-off-by: Takashi Iwai <tiwai@suse.de>

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Asai Neko 2026-09-14 18:58:29 +08:00 • committed by Takashi Iwai

parent 1c4f620287

commit 5ab3dc6477

1 changed files with 13 additions and 0 deletions

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sound/usb/mixer_maps.c

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