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| author | Olivier Kaloudoff <olivier.kaloudoff@gmail.com> | 2026-10-09 01:08:44 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2026-10-09 15:06:38 +0200 |
| commit | 874323b68c93c6808e034dc0113681e822e6fb42 (patch) | |
| tree | a794abbceaa3cd11b10ecb9f74d7aa837f6cf742 /tools/lib/python | |
| parent | b83b78df0e53d9dd872d24e49a99658815b12770 (diff) | |
ALSA: usb-audio: Add mic resolution quirk for Logitech Webcam C200
The C200 (046d:0802) reports a mic capture volume range of
1536..7680 with a resolution of 1 (6144 steps), triggering
"Warning! Unlikely big volume step count (=6144), linear volume or
wrong cval->res?" at probe and exposing a uselessly fine-grained
mixer control. This is the same firmware behavior as the other
UVC-era Logitech webcams already carrying QUIRK_FLAG_MIC_RES_384
(C500, C600, C210, C270, C310, C510, C525, ...), so apply the same
quirk: CTL_MSG_DELAY_1M (which the Logitech VENDOR_FLG would provide
if the device-specific entry did not short-circuit the lookup) plus
MIC_RES_384.
Verified on real hardware: with the quirk the warning disappears and
the driver logs "set resolution quirk: cval->res = 384".
Signed-off-by: Olivier Kaloudoff <olivier.kaloudoff@gmail.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261008230844.11246-1-olivier.kaloudoff@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'tools/lib/python')
0 files changed, 0 insertions, 0 deletions