Re: [PATCH] ALSA: dummy: Report a change when one capture switch channel moves

[Takashi Iwai]

On Tue, 01 Sep 2026 17:39:21 +0200,
HyeongJun An wrote:
> 
> The snd_dummy_capsrc_put() builds its change flag with &&, so it reports
> a change only when both channels move at once.  Writing a single channel
> stores the new value and returns 0, the control core then sends no
> SNDRV_CTL_EVENT_MASK_VALUE, and a second reader keeps showing the old
> setting until it polls again.
> 
> The volume put a few lines above compares the same pair of channels with
> ||.
> 
> The mixer selftest already reports this.  With snd-dummy loaded it fails
> event_missing on all five capture switches:
> 
>   # CD Capture Switch.1 orig 0 read 1, is_volatile 0
>   not ok 13 event_missing.Dummy.9
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Assisted-by: Claude:claude-opus-5
> Signed-off-by: HyeongJun An <sammiee5311@xxxxxxxxx>

Applied now.  Thanks.


Takashi