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USB keyboard is not initialized at boot time :
kernel: [    3.228048] usb 3-2: new full-speed USB device number 3 using ohci-pci
kernel: [    3.368040] usb 3-2: device descriptor read/64, error -62
kernel: [    3.612041] usb 3-2: device descriptor read/64, error -62
kernel: [    3.852042] usb 3-2: new full-speed USB device number 4 using ohci-pci
kernel: [    4.260040] usb 3-2: device not accepting address 4, error -62
kernel: [    4.396044] usb 3-2: new full-speed USB device number 5 using ohci-pci
kernel: [    4.804036] usb 3-2: device not accepting address 5, error -62
kernel: [    4.804045] usb usb3-port2: unable to enumerate USB device

but it's ok after boot and deplug/replug :
kernel: [  792.576075] usb 3-2: new full-speed USB device number 6 using ohci-pci
kernel: [  792.743118] usb 3-2: New USB device found, idVendor=04b3, idProduct=301a
kernel: [  792.743127] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
kernel: [  792.743133] usb 3-2: Product: USB 1.1 2port downstream low power hub
kernel: [  792.743138] usb 3-2: Manufacturer: Lite-On Technology
kernel: [  792.749217] hub 3-2:1.0: USB hub found
kernel: [  793.037123] usb 3-2.1: new full-speed USB device number 7 using ohci-pci
kernel: [  793.147119] usb 3-2.1: New USB device found, idVendor=04b3, idProduct=301b
kernel: [  793.147127] usb 3-2.1: New USB device strings: Mfr=1, Product=3, SerialNumber=0
kernel: [  793.147133] usb 3-2.1: Product: USB Productivity Option Keyboard( has the hub in # 1 )
kernel: [  793.147138] usb 3-2.1: Manufacturer: Lite-On Technology
kernel: [  793.158477] input: Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 ) as /devices/pci0000:00/0000:00:12.0/usb3/3-2/3-2.1/3-2.1:1.0/0003:04B3:301B.0002/input/input11
kernel: [  793.212422] hid-generic 0003:04B3:301B.0002: input,hidraw1: USB HID v1.10 Keyboard [Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 )] on usb-0000:00:12.0-2.1/input0
kernel: [  793.219303] input: Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 ) as /devices/pci0000:00/0000:00:12.0/usb3/3-2/3-2.1/3-2.1:1.1/0003:04B3:301B.0003/input/input12
kernel: [  793.272414] hid-generic 0003:04B3:301B.0003: input,hidraw2: USB HID v1.10 Device [Lite-On Technology USB Productivity Option Keyboard( has the hub in # 1 )] on usb-0000:00:12.0-2.1/input1
mtp-probe: checking bus 3, device 7: "/sys/devices/pci0000:00/0000:00:12.0/usb3/3-2/3-2.1"

This was working well before last

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: libgusb2 0.2.4-1
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
Uname: Linux 3.19.0-18-generic x86_64
ApportVersion: 2.17.3-0ubuntu1
Architecture: amd64
Date: Wed May 27 15:40:15 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-01-27 (120 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: libgusb
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily
-- 
usb keyboard not recognized at boot time
https://bugs.launchpad.net/bugs/1459246
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