Re: [PATCH v4] ALSA: usb-audio: Add quirk for Logitech PRO X 2 LIGHTSPEED

[Antheas Kapenekakis]

On Fri, 31 Jul 2026 at 05:13, Brian van den Berg <faxuser@xxxxxxxxx> wrote:
>
> The UAC mixer of Logitech PRO X 2 LIGHTSPEED works fine except that its
> volume GET_CUR method returns sticky values.
>
> Since commit 86aa1ea1f15c
> ("ALSA: usb-audio: Do not expose sticky mixers"), the sticky check
> considers the mixer to be sticky and unnecessarily disables the mixer.
>
> Add QUIRK_FLAG_MIXER_GET_CUR_BROKEN for Logitech PRO X 2 LIGHTSPEED
> (046d:0af7) to address this.
>
> Compiled and tested on 7.2-rc5

There is a first time for everything. Happy to have helped with your
first submission. The description still seems a bit vague to me as I
do not have the mixer. Maybe there is a better way to phrase it. But I
will leave this up to Takashi and Jaroslav. Hopefully next time you
get most things right on the V1 ;)

Reviewed-by: Antheas Kapenekakis <lkml@xxxxxxxxxxx>

> Signed-off-by: Brian van den Berg <faxuser@xxxxxxxxx>
> ---
> Output with quirk enabled:
>
>   usb 3-2.1: New USB device found, idVendor=046d, idProduct=0af7, bcdDevice= 1.00
>   usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
>   usb 3-2.1: Product: PRO X 2 LIGHTSPEED
>   usb 3-2.1: Manufacturer: Logitech
>   usb 3-2.1: SerialNumber: 0000000000000000
>   input: Logitech PRO X 2 LIGHTSPEED Consumer Control as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:046D:0AF7.0003/input/input6
>   input: Logitech PRO X 2 LIGHTSPEED as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:046D:0AF7.0003/input/input7
>   input: Logitech PRO X 2 LIGHTSPEED as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb3/3-2/3-2.1/3-2.1:1.3/0003:046D:0AF7.0003/input/input8
>   usb 3-2.1: 2:0: broken mixer GET_CUR (-18944/0/256 => -2662)
>   usb 3-2.1: 6:0: broken mixer GET_CUR (-18944/0/256 => 0)
>
> Changes in v2:
> - Commmit message missed the version I compiled and tested it on.
> - I forgot to add v2 to the patch.
> Changes in v3:
> - I included the wrong patchfile in which I forgot a comma.
> I did compile the correct fix but just to be sure I recompiled
> and tested the change again.
> Changes in v4:
> I don't know how that file deletion was added to the patch.
> I removed it, recompiled and tested again.
> Hopefully this is okay now.
> ---
>  sound/usb/quirks.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 0de7c9d94259..3bd66094863d 100644
> --- a/sound/usb/quirks.c
> +++ b/sound/usb/quirks.c
> @@ -2251,6 +2251,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
>         DEVICE_FLG(0x046d, 0x0a8f, /* Logitech H390 headset */
>                    QUIRK_FLAG_CTL_MSG_DELAY_1M |
>                    QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
> +       DEVICE_FLG(0x046d, 0x0af7, /* Logitech PRO X 2 LIGHTSPEED */
> +                  QUIRK_FLAG_MIXER_GET_CUR_BROKEN),
>         DEVICE_FLG(0x0499, 0x1506, /* Yamaha THR5 */
>                    QUIRK_FLAG_GENERIC_IMPLICIT_FB),
>         DEVICE_FLG(0x0499, 0x1509, /* Steinberg UR22 */
>
> base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff
> --
> 2.55.0
>
>
>