[lkml]   [2021]   [Mar]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] ALSA: usb-audio: Apply sample rate quirk to Logitech Connect
On Wed, 24 Mar 2021 13:03:14 +0100,
Ikjoon Jang wrote:
> On Wed, Mar 24, 2021, 7:16 PM Joakim Tjernlund <>
> wrote:
> On Wed, 2021-03-24 at 18:51 +0800, Ikjoon Jang wrote:
> > Logitech ConferenceCam Connect is a compound USB device with UVC and
> > UAC. Not 100% reproducible but sometimes it keeps responding STALL to
> > every control transfer once it receives get_freq request.
> >
> > This patch adds 046d:0x084c to a snd_usb_get_sample_rate_quirk list.
> >
> > Bugzilla:
> > Signed-off-by: Ikjoon Jang <>
> Most Logitech USB headset I got needs a delay in snd_usb_ctl_msg_quirk()
> Have you tried to add say 20 ms delay in there?
> I didn't try that. But it sounds reasonable to me.
> let me try that quirk here. If that is the case, HID might need that delay
> also. Logitech Group webcam had a similar problem on control xfer of
> get_report from an another interface for HID.

The Logitech devices with 046d:* should be covered generally in
snd_usb_ctl_msg_quirk(), so I guess it's a different problem.
But please check it first.

> And 20ms can be too long if it's applied to every control transfer. I will
> test the device with shorter delay if you didn't try it before.

Actually the delay applied to Logitech devices is from 1 to 2ms, not
20ms. The 20ms delay is applied for some other devices. But if
extending the delay fixes the problem, we need to reconsider the delay


 \ /
  Last update: 2021-03-24 13:50    [W:0.072 / U:2.296 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site