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User-Agent: Mozilla Thunderbird Content-Language: de-DE To: linux-hotplug@vger.kernel.org From: =?UTF-8?Q?Hans_J=C3=B6rg_Paliege?= Subject: potential bug or quirk in the linux kernel usb subsystem, usb microphone sampling rate resolution rate Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:IQgJBY9nkiQzo0ZFY8YMY7eTXUsaHLoqekTr9AJH7iOArKNPYAK DW6xsxVeBs+WAuUsE8uDBvrJDr/G+oifdu4dKRMve+ol70so3TFLpqbSA83QbOIFnq+HGvc d8kN12oYhhw7yoJUhBkbdABvrJtf4e/z1XerDzkcJlSBbiGJxus3Eo54c+sYzE7WLclpjTM CY5tS5/EHAkr1MkXtDcfw== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:zQthOkBGU/4=;1z4ipHeLe2njo9RINvD4dvJwDT+ MDtBeDBRA3RbwE9MwAhQ1FvimfJhpTGKOCKzywcAi7aq/eyqVPRSSd/esqkFYjUkPcXGuL+Xp AORr9D0a0oP3Ns4HZ6+tu0d/xPagnCroO35ojJ/yrFffmuW4vP5TRI+NmKxOoQrwjHaUorNzQ LTWHlU1EiEnHuo6EqQRjslCI5nKY5ztLDvwEiiE31vGfYe+kU5MwhODHnrgmr0qF1+FvVM+s1 sAwR77r1oArka/IdLRr3Ha2/asz1iAZdNiKfoit2sBO00A0Z/V/YQkGUQrLCDnZ8KcenXjlny 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tIgDAX/AMz4lEjcedt6OrZ/L9cUnYkRz72IopsnJK6+ad90L+CZVr7gIs36Jw5SseNyWKiwy5 T/qiTHQeYw0JqVBBsjWX2BuR9yPOIkiXXTMCUcXvZamUhIelMT1k+02PXR3g+YJWE2IE8wyMG 1Kc5k2BWrECEcVmO9dVcaWOpOVOCDh6TBElXOLVyuUvNtqzcJHugO9AdBdcWY0hnjROn2N70H LYaAG4320aTIyrdVSagyCGemMTQnxnwg0RbpIhCKZd2iv3d+HsQ== Hello Mr. Kroah-Hartman, my name is Hans Paliege and i am a longtime Linux user, but i came=20 across a potential peculiar quirk or bug in the usb subsystem that may need your attention. According to the kernel documentation i=20 should contact You as the main developer directly. I am using a debian unstable amd64 build that is updated daily, and=20 during boot for about two weeks now the audio frequency sample rate of my logitech C270 usb webcam is no=20 longer initialized correctly. As a result the webcam only delivers video but no audio. The webcam=20 microphone is as a audio device recognized by the webbrowser but the input is null. During boot the dmesg error messages are: [ +0,007125] usb 3-1: current rate 24000 is different from the runtime=20 rate 16000 [ +0,002572] usb 3-1: 3:3: cannot set freq 24000 to ep 0x82 After manual usbreset of the logitech C270 webcam the dmesg error=20 messages are: [M=C3=A4r 2 22:13] usb 3-6.2: reset full-speed USB device number 7 using x= hci_hcd [ +12,959814] usb 3-1: reset high-speed USB device number 2 using xhci_hcd [ +0,288046] uvcvideo 3-1:1.0: Found UVC 1.00 device C270 HD WEBCAM=20 (046d:0825) [ +0,036940] usb 3-1: current rate 16000 is different from the runtime=20 rate 32000 [ +0,063995] usb 3-1: current rate 24000 is different from the runtime=20 rate 16000 [ +0,061679] usb 3-1: 3:3: cannot set freq 24000 to ep 0x82 [ +0,213449] usb 3-1: set resolution quirk: cval->res =3D 384 After some internet search i could not find any specific command,=20 application or grub boot parameter to manually set the rate to the=20 runtime rate of 16000 or 32000. The quirk seems to be, that the sampling rate is automatically set to=20 the value of 24000, while the actual working runtime rates are ignored. Any subsequent pipewire-alsa related audio volume and input/output works= =20 fine, and i have to use a really old ZOOM H2 usb microphone at 44100=20 that works for now. Maybe a recent change in the linux kernel or the usb subsytem caused=20 this. It would be great if you could take a closer look at it and fix it. Thank you very much. Best regards Hans Paliege