My Ubuntu 13.10 server (Upgraded from 11.10) has always had an issue with mounting USB 2.0 devices. Despite legacy being turned off on the motherboard bios, the output of lsusb -t always shows the following:root@mediaserver:~# lsusb -t/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M    |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 12M/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/8p, 480MI've tried every USB port on the computer, including the front ports which are connected to internal headers. I'm not 100% sure what the difference between ehci-pci and uhci_hcd is to be honest. As you can see, my USB 2.0 drive is being given 12M, which is far too slow.Here is a shortened output of dmesg from the last boot with the USB drive connected:[    0.000000] Initializing cgroup subsys cpuset[    0.000000] Initializing cgroup subsys cpu[    0.000000] Initializing cgroup subsys cpuacct[    0.000000] Linux version 3.11.0-12-generic (buildd@allspice) (gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu7) ) #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 (Ubuntu 3.11.0-12.19-generic 3.11.3)[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=37d96d65-85fd-4a26-9817-57820fed9a83 ro nomodeset usbcore.autosuspend=-1 video=uvesafb:mode_option=1920x1080-24,mtrr=3,scroll=ywrap splash quiet[    0.559482] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver[    0.559484] ehci-pci: EHCI PCI platform driver[    0.559549] ehci-pci 0000:00:1d.7: setting latency timer to 64[    0.559559] ehci-pci 0000:00:1d.7: EHCI Host Controller[    0.559565] ehci-pci 0000:00:1d.7: new USB bus registered, assigned bus number 1[    0.559578] ehci-pci 0000:00:1d.7: debug port 1[    0.563475] ehci-pci 0000:00:1d.7: cache line size of 32 is not supported[    0.563480] ehci-pci 0000:00:1d.7: irq 23, io mem 0xf9ffbc00[    0.572019] ehci-pci 0000:00:1d.7: USB 2.0 started, EHCI 1.00[    0.572053] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002[    0.572058] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1[    0.572062] usb usb1: Product: EHCI Host Controller[    0.572067] usb usb1: Manufacturer: Linux 3.11.0-12-generic ehci_hcd[    0.572070] usb usb1: SerialNumber: 0000:00:1d.7[    0.572191] hub 1-0:1.0: USB hub found[    0.572196] hub 1-0:1.0: 8 ports detected[    0.572336] ehci-platform: EHCI generic platform driver[    0.572343] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver[    0.572345] ohci-platform: OHCI generic platform driver[    0.572351] uhci_hcd: USB Universal Host Controller Interface driver[    0.572409] uhci_hcd 0000:00:1d.0: setting latency timer to 64[    0.572412] uhci_hcd 0000:00:1d.0: UHCI Host Controller[    0.572421] uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2[    0.572443] uhci_hcd 0000:00:1d.0: irq 23, io base 0x0000c480[    0.572471] usb usb2: New USB device found, idVendor=1d6b, idProduct=0001[    0.572474] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1[    0.572476] usb usb2: Product: UHCI Host Controller[    0.572478] usb usb2: Manufacturer: Linux 3.11.0-12-generic uhci_hcd[    0.572480] usb usb2: SerialNumber: 0000:00:1d.0[    0.572554] hub 2-0:1.0: USB hub found[    0.572558] hub 2-0:1.0: 2 ports detected[    0.572666] uhci_hcd 0000:00:1d.1: setting latency timer to 64[    0.572669] uhci_hcd 0000:00:1d.1: UHCI Host Controller[    0.572676] uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3[    0.572706] uhci_hcd 0000:00:1d.1: irq 19, io base 0x0000c800[    0.572735] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001[    0.572738] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1[    0.572740] usb usb3: Product: UHCI Host Controller[    0.572742] usb usb3: Manufacturer: Linux 3.11.0-12-generic uhci_hcd[    0.572743] usb usb3: SerialNumber: 0000:00:1d.1[    0.572817] hub 3-0:1.0: USB hub found[    0.572821] hub 3-0:1.0: 2 ports detected[    0.572927] uhci_hcd 0000:00:1d.2: setting latency timer to 64[    0.572930] uhci_hcd 0000:00:1d.2: UHCI Host Controller[    0.572935] uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 4[    0.572964] uhci_hcd 0000:00:1d.2: irq 18, io base 0x0000c880[    0.572992] usb usb4: New USB device found, idVendor=1d6b, idProduct=0001[    0.572994] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1[    0.572996] usb usb4: Product: UHCI Host Controller[    0.572998] usb usb4: Manufacturer: Linux 3.11.0-12-generic uhci_hcd[    0.573000] usb usb4: SerialNumber: 0000:00:1d.2[    0.573073] hub 4-0:1.0: USB hub found[    0.573076] hub 4-0:1.0: 2 ports detected[    0.573185] uhci_hcd 0000:00:1d.3: setting latency timer to 64[    0.573188] uhci_hcd 0000:00:1d.3: UHCI Host Controller[    0.573193] uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 5[    0.573221] uhci_hcd 0000:00:1d.3: irq 16, io base 0x0000cc00[    0.573253] usb usb5: New USB device found, idVendor=1d6b, idProduct=0001[    0.573255] usb usb5: New USB device strings: Mfr=3, Product=2, SerialNumber=1[    0.573257] usb usb5: Product: UHCI Host Controller[    0.573259] usb usb5: Manufacturer: Linux 3.11.0-12-generic uhci_hcd[    0.573261] usb usb5: SerialNumber: 0000:00:1d.3[    0.573346] hub 5-0:1.0: USB hub found[    0.573349] hub 5-0:1.0: 2 ports detected[    1.328018] usb 2-1: new full-speed USB device number 2 using uhci_hcd[    1.467478] usb 2-1: not running at top speed; connect to a high speed hub[    1.495481] usb 2-1: New USB device found, idVendor=1132, idProduct=4511[    1.495483] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3[    1.495486] usb 2-1: Product: IT-CEO USB Device[    1.495488] usb 2-1: Manufacturer: IT-CEO[    1.495490] usb 2-1: SerialNumber: 5A314631525A394720202020[    1.499526] usb-storage 2-1:1.0: USB Mass Storage device detected[    1.499704] scsi4 : usb-storage 2-1:1.0[    1.499766] usbcore: registered new interface driver usb-storage[    1.500018] tsc: Refined TSC clocksource calibration: 2520.652 MHz[    1.513120] uvesafb: VBIOS/hardware doesn't support DDC transfers[    1.513123] uvesafb: no monitor limits have been set, default refresh rate will be used[    1.513351] uvesafb: scrolling: redraw[    1.736015] usb 5-1: new low-speed USB device number 2 using uhci_hcd[    1.912254] usb 5-1: New USB device found, idVendor=045e, idProduct=078c[    1.912256] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0[    1.912257] usb 5-1: Product: USB Keyboard[    1.912258] usb 5-1: Manufacturer: LITEON Technology[    1.934599] hidraw: raw HID events driver (C) Jiri Kosina[    1.951425] usbcore: registered new interface driver usbhid[    1.951425] usbhid: USB HID core driver[    1.953425] input: LITEON Technology USB Keyboard as /devices/pci0000:00/0000:00:1d.3/usb5/5-1/5-1:1.0/input/input2[    1.953793] hid-generic 0003:045E:078C.0001: input,hidraw0: USB HID v1.10 Keyboard [LITEON Technology USB Keyboard] on usb-0000:00:1d.3-1/input0[    1.961414] Console: switching to colour frame buffer device 160x64[    1.964561] uvesafb: framebuffer at 0xfb000000, mapped to 0xffffc90004400000, using 10240k, total 14336kSome people have suggested blacklisting uhci_hcd but it seems to load anyway for me.I'm also getting the following when trying to unload USB modules as described here:root@mediaserver:~# rmmod ehci_hcdlibkmod: ERROR ../libkmod/libkmod-module.c:1802 kmod_module_get_holders: could not open '/sys/module/ehci_hcd/holders': No such file or directoryError: Module ehci_hcd is in useroot@mediaserver:~# rmmod uhci_hcdlibkmod: ERROR ../libkmod/libkmod-module.c:1802 kmod_module_get_holders: could not open '/sys/module/uhci_hcd/holders': No such file or directoryError: Module uhci_hcd is in useMy motherboard information:Manufacturer: ASUSTeK Computer INC.Product Name: P5KPL-AM
All USB ports detected as USB 1.0, not USB 2.0
ubuntu;usb;external hdd