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83162eeaf7
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: 1da177e4c3 ("Linux-2.6.12-rc2")
Assisted-by: Claude:claude-opus-5
Signed-off-by: HyeongJun An <sammiee5311@gmail.com>
Link: https://patch.msgid.link/20260901153921.3971-1-sammiee5311@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
1208 lines
32 KiB
1208 lines
32 KiB