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From: Vyacheslav Vahnenko <vahnenko2003@gmail.com>
To: gregkh@linuxfoundation.org
Cc: linux-usb@vger.kernel.org, vahnenko2003@gmail.com
Subject: ezcap401 needs USB_QUIRK_NO_BOS to function on 10gbs usb speed
Date: Fri, 13 Mar 2026 15:36:38 +0300	[thread overview]
Message-ID: <20260313123638.20481-1-vahnenko2003@gmail.com> (raw)
In-Reply-To: <2026031332-askew-policy-c4ec@gregkh>

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 :)

Vyacheslav

  reply	other threads:[~2026-03-13 12:36 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-12 18:10 ezcap401 needs USB_QUIRK_NO_BOS to function on 10gbs usb speed CaTaTo
2026-03-13  7:08 ` Greg KH
2026-03-13  9:54   ` CaTaTo
2026-03-13 10:11     ` Greg KH
2026-03-13 11:01       ` Vyacheslav Vahnenko
2026-03-13 12:04         ` Greg KH
2026-03-13 12:36           ` Vyacheslav Vahnenko [this message]
2026-03-13 17:20             ` ezcap401 needs USB_QUIRK_NO_BOS to function on 10gbs usb speed Greg KH

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