[PATCH] USB: quirks: add USB_QUIRK_NO_LPM for ELECOM DEFT Pro TrackBall

[PATCH] USB: quirks: add USB_QUIRK_NO_LPM for ELECOM DEFT Pro TrackBall

[David Pieters]

The 2.4GHz wireless USB receiver of the ELECOM DEFT Pro TrackBall
(056e:0132) and its wired counterpart (056e:0131) fail to handle USB
Link Power Management (LPM / USB 2.0 L1 sleep states) during initial
enumeration on modern USB host controllers. When LPM negotiation occurs
at boot, the device stalls and fails to register any input events until
it is physically unplugged and replugged.

Applying USB_QUIRK_NO_LPM prevents LPM negotiation and allows the device
to initialize properly at system boot.

Signed-off-by: David Pieters <davidpieters1978@gmail.com>
---
 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 1234567..89abcdef 100644
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -350,6 +350,10 @@ static const struct usb_device_id usb_quirk_list[] = {
 	/* Corsair Strafe RGB */
 	{ USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT },

+	/* ELECOM DEFT Pro TrackBall (fails on USB Link Power Management) */
+	{ USB_DEVICE(0x056e, 0x0131), .driver_info = USB_QUIRK_NO_LPM },
+	{ USB_DEVICE(0x056e, 0x0132), .driver_info = USB_QUIRK_NO_LPM },
+
 	{ }  /* terminating entry must be last */
 };

-- 
2.43.0

Re: [PATCH] USB: quirks: add USB_QUIRK_NO_LPM for ELECOM DEFT Pro TrackBall

[Greg Kroah-Hartman]

On Wed, Sep 30, 2026 at 02:40:34AM -0700, David Pieters wrote:
> The 2.4GHz wireless USB receiver of the ELECOM DEFT Pro TrackBall
> (056e:0132) and its wired counterpart (056e:0131) fail to handle USB
> Link Power Management (LPM / USB 2.0 L1 sleep states) during initial
> enumeration on modern USB host controllers. When LPM negotiation occurs
> at boot, the device stalls and fails to register any input events until
> it is physically unplugged and replugged.
> 
> Applying USB_QUIRK_NO_LPM prevents LPM negotiation and allows the device
> to initialize properly at system boot.
> 
> Signed-off-by: David Pieters <davidpieters1978@gmail.com>
> ---
>  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 1234567..89abcdef 100644
> --- a/drivers/usb/core/quirks.c
> +++ b/drivers/usb/core/quirks.c
> @@ -350,6 +350,10 @@ static const struct usb_device_id usb_quirk_list[] = {
>  	/* Corsair Strafe RGB */
>  	{ USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT },
> 
> +	/* ELECOM DEFT Pro TrackBall (fails on USB Link Power Management) */
> +	{ USB_DEVICE(0x056e, 0x0131), .driver_info = USB_QUIRK_NO_LPM },
> +	{ USB_DEVICE(0x056e, 0x0132), .driver_info = USB_QUIRK_NO_LPM },

Shouldn't this be in sorted order?

And isn't this a v2 patch?

thanks,

greg k-h

[PATCH v2] USB: quirks: add USB_QUIRK_NO_LPM for ELECOM DEFT Pro TrackBall

[David Pieters]

The 2.4GHz wireless USB receiver of the ELECOM DEFT Pro TrackBall
(056e:0132) and its wired counterpart (056e:0131) fail to handle USB
Link Power Management (LPM / USB 2.0 L1 sleep states) during initial
enumeration on modern USB host controllers. When LPM negotiation occurs
at boot, the device stalls and fails to register any input events until
it is physically unplugged and replugged.

Applying USB_QUIRK_NO_LPM prevents LPM negotiation and allows the device
to initialize properly at system boot.

Signed-off-by: David Pieters <davidpieters1978@gmail.com>
---
v2:
 - Insert entries in sorted numerical order by Vendor ID / Product ID
   in usb_quirk_list, as requested by Greg Kroah-Hartman.

--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -329,6 +329,10 @@
 	{ USB_DEVICE(0x04f3, 0x21b8), .driver_info =
 			USB_QUIRK_DEVICE_QUALIFIER },

+	/* ELECOM DEFT Pro TrackBall */
+	{ USB_DEVICE(0x056e, 0x0131), .driver_info = USB_QUIRK_NO_LPM },
+	{ USB_DEVICE(0x056e, 0x0132), .driver_info = USB_QUIRK_NO_LPM },
+
 	/* Roland SC-8820 */
 	{ USB_DEVICE(0x0582, 0x0007), .driver_info = USB_QUIRK_RESET_RESUME },

Re: [PATCH] USB: quirks: add USB_QUIRK_NO_LPM for ELECOM DEFT Pro TrackBall

[Greg KH]

On Wed, Sep 30, 2026 at 08:39:06AM +0200, David Pieters wrote:
> The 2.4GHz wireless USB receiver of the ELECOM DEFT Pro TrackBall
> (056e:0132) and its wired counterpart (056e:0131) fail to handle USB
> Link Power Management (LPM / USB 2.0 L1 sleep states) during initial
> enumeration on modern USB host controllers. When LPM negotiation occurs
> at boot, the device stalls and fails to register any input events until
> it is physically unplugged and replugged.
> 
> Applying USB_QUIRK_NO_LPM prevents LPM negotiation and allows the device
> to initialize properly at system boot.
> 
> Signed-off-by: David Pieters <davidpieters1978@gmail.com>
> ---
>  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 8923a10e7b41..0f34e819b22a 100644
> --- a/drivers/usb/core/quirks.c
> +++ b/drivers/usb/core/quirks.c
> @@ -350,6 +350,10 @@ static const struct usb_device_id usb_quirk_list[] = {
>   /* Corsair Strafe RGB */
>   { USB_DEVICE(0x1b1c, 0x1b20), .driver_info = USB_QUIRK_DELAY_INIT },
> 
> + /* ELECOM DEFT Pro TrackBall (fails on USB Link Power Management) */
> + { USB_DEVICE(0x056e, 0x0131), .driver_info = USB_QUIRK_NO_LPM },
> + { USB_DEVICE(0x056e, 0x0132), .driver_info = USB_QUIRK_NO_LPM },
> +
>   { }  /* terminating entry must be last */
>  };
> 
> -- 
> 2.43.0

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
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thanks,

greg k-h's patch email bot