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Ubuntu cannot see one of my USB ports. I am using a Asus A42N laptop, which has 3 USB ports. I am dual-booting Ubuntu 12.04 & Windows 7 ; in Windows 7 all 3 of my USB ports work well. When I log into Ubuntu only 2 of my USB ports are detected.

$ lsusb
Bus 002 Device 002: ID 04f2:b1e5 Chicony Electronics Co., Ltd 
Bus 004 Device 003: ID 12d1:14ac Huawei Technologies Co., Ltd. 
Bus 006 Device 002: ID 15d9:0a4c Trust International B.V. USB+PS/2 Optical Mouse
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
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