Default [Q] lost otg for slimbean with m-kernel

hey buddies there

i flashed my n7 2012 to the latest slimbean.its rly and smooth
and i use the m-kernel

but i lately found i can't use the otg not sure whether its becuz of the slimbean or m-kernel.i can ensure it works when i use the stock rom with the stickmout.but now when i connect the otg cable with the usb storage,the stickmout can't recognize it,and in the storage section of the setting,its empty in the area of the removable disks,let alone whether i can see the content of the usb disk thro the explorer...

it would be thankful if anyone can help.