mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-06-02 08:42:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

USB: quirks: add NO_LPM for Lenovo ThinkPad USB-C Dock Gen2 hub controllers

Browse Source 
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 <fuhrysteve@gmail.com>
Cc: stable <stable@kernel.org>
Link: https://patch.msgid.link/20260513171419.44849-1-fuhrysteve@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen J. Fuhry
2026-05-13 13:14:19 -04:00
committed by Greg Kroah-Hartman
parent 121d2f682b
commit 9ddb9c0dec
1 changed files with 4 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/usb/core/quirks.c
View File

@@ -513,6 +513,10 @@ static const struct usb_device_id usb_quirk_list[] = {
/* Lenovo ThinkPad USB-C Dock Gen2 Ethernet (RTL8153 GigE) */
{ USB_DEVICE(0x17ef, 0xa387), .driver_info = USB_QUIRK_NO_LPM },
/* Lenovo ThinkPad USB-C Dock Gen2 USB 3.1 and USB 2.0 hub controllers */
{ USB_DEVICE(0x17ef, 0xa391), .driver_info = USB_QUIRK_NO_LPM },
{ USB_DEVICE(0x17ef, 0xa392), .driver_info = USB_QUIRK_NO_LPM },
/* BUILDWIN Photo Frame */
{ USB_DEVICE(0x1908, 0x1315), .driver_info =
USB_QUIRK_HONOR_BNUMINTERFACES },