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[97.137.122.73]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8c90c35cdb1sm793836d6.46.2026.05.13.10.14.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2026 10:14:20 -0700 (PDT) From: "Stephen J. Fuhry" To: gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, "Stephen J. Fuhry" Subject: [PATCH] USB: quirks: add NO_LPM for Lenovo ThinkPad USB-C Dock Gen2 hub controllers Date: Wed, 13 May 2026 13:14:19 -0400 Message-ID: <20260513171419.44849-1-fuhrysteve@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The Lenovo ThinkPad USB-C Dock Gen2 (17ef:a391, 17ef:a392) hub controllers exhibit link instability when USB Link Power Management is enabled, similar to the dock's Ethernet adapter (17ef:a387) which already carries USB_QUIRK_NO_LPM. When the dock reconnects after a transient disconnect, the hub controllers enter LPM states between re-enumeration retries, causing repeated disconnect/reconnect cycles lasting up to two minutes. Disabling LPM for these devices restores stable enumeration. Signed-off-by: Stephen J. Fuhry --- drivers/usb/core/quirks.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 0ffdaefba..87810eff9 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -513,6 +513,10 @@ static const struct usb_device_id usb_quirk_list[] =3D= { /* Lenovo ThinkPad USB-C Dock Gen2 Ethernet (RTL8153 GigE) */ { USB_DEVICE(0x17ef, 0xa387), .driver_info =3D USB_QUIRK_NO_LPM }, =20 + /* Lenovo ThinkPad USB-C Dock Gen2 USB 3.1 and USB 2.0 hub controllers */ + { USB_DEVICE(0x17ef, 0xa391), .driver_info =3D USB_QUIRK_NO_LPM }, + { USB_DEVICE(0x17ef, 0xa392), .driver_info =3D USB_QUIRK_NO_LPM }, + /* BUILDWIN Photo Frame */ { USB_DEVICE(0x1908, 0x1315), .driver_info =3D USB_QUIRK_HONOR_BNUMINTERFACES }, --=20 2.47.3