Re: [PATCH] ALSA: usb-audio: skip the broken mute control on AVerMedia GC553Pro

[Takashi Iwai]

On Mon, 14 Sep 2026 12:58:29 +0200,
Asai Neko wrote:
> 
> 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@xxxxxxx>

Applied now.  Thanks.


Takashi