Hi,

Somewhere between: v3.5-rc6-196-gfdb1335 and v3.6-rc1-355-gddf343f my usb 
keyboard/trackpoint combination stopped working. At first I thought that would 
be some early merge related issue and waited (yeayea, sorry), but up to v3.6-
rc3-177-gc182ae4 its still not working.
Since then no relevant commits seem to have gone in.

Interestingly the keyboard/mouse is successfully recognized and shows up in 
lsub.

With a quick grep I just discovered that a new driver for this (or similar?) 
keyboards has been added. I have *not* compiled this in though:
+# CONFIG_HID_LENOVO_TPKBD is not set

Is the new, unconditional, entry in the hid_have_special_driver struct the 
problem?
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 8e3a6b2..f695680 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1544,6 +1544,7 @@ static const struct hid_device_id 
hid_have_special_driver[] = {
    { HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_EASYPEN_M610X) },
    { HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, 
USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD) },
    { HID_USB_DEVICE(USB_VENDOR_ID_LCPOWER, USB_DEVICE_ID_LCPOWER_LC1000 ) },
+   { HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPKBD) },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
    { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER_2) },

Other entries seem to be protected via things like:
#if IS_ENABLED(CONFIG_HID_LOGITECH_DJ)

I have somewhat obsoleted my original line of thought in this email, but hell. 
Will try this and send a patch if it works.

Greetings,

Andres