Re: ezcap401 needs USB_QUIRK_NO_BOS to function on 10gbs usb speed

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Mar 13, 2026 at 03:36:38PM +0300, Vyacheslav Vahnenko wrote:
> Add USB_QUIRK_NO_BOS for ezcap401 capture card, without it dmesg will show
> "unable to get BOS descriptor or descriptor too short"
> and "unable to read config index 0 descriptor/start: -71" errors
> and device will not able to work at full speed at 10gbs
> 
> Signed-off-by: Vyacheslav Vahnenko <vahnenko2003@gmail.com>
> ---
>  drivers/usb/core/quirks.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
> index 9e7e49712..0010f41a3 100644
> --- a/drivers/usb/core/quirks.c
> +++ b/drivers/usb/core/quirks.c
> @@ -574,6 +574,9 @@ static const struct usb_device_id usb_quirk_list[] = {
>  	/* Alcor Link AK9563 SC Reader used in 2022 Lenovo ThinkPads */
>  	{ USB_DEVICE(0x2ce3, 0x9563), .driver_info = USB_QUIRK_NO_LPM },
>  
> +	/* ezcap401 - BOS descriptor fetch hangs at SuperSpeed Plus */
> +	{ USB_DEVICE(0x32ed, 0x0401), .driver_info = USB_QUIRK_NO_BOS },
> +
>  	/* DELL USB GEN2 */
>  	{ USB_DEVICE(0x413c, 0xb062), .driver_info = USB_QUIRK_NO_LPM | USB_QUIRK_RESET_RESUME },
>  
> -- 
> 2.53.0
> 
> Thanks Greg for your patience, I'm not familiar with email stuff let alone kernel maintenance :)

Not a problem.  There was some minor issues with this one (prefix of
subject, and no v2 information), but I've fixed it up and applied it
now, thanks!

greg k-h