It seems dmesg wasn't included:
[ 2794.402505] irq 16: nobody cared (try booting with the "irqpoll" option)
[ 2794.402535] Pid: 0, comm: swapper/0 Tainted: P           O 3.2.0-35-generic 
#55-Ubuntu
[ 2794.402543] Call Trace:
[ 2794.402564]  [<c1560f2c>] ? printk+0x2d/0x2f
[ 2794.402581]  [<c10b1259>] __report_bad_irq+0x29/0xd0
[ 2794.402593]  [<c10b14b4>] note_interrupt+0x104/0x150
[ 2794.402606]  [<c107c1d4>] ? tick_nohz_stop_sched_tick+0x2b4/0x410
[ 2794.402618]  [<c10af38f>] handle_irq_event_percpu+0x9f/0x1f0
[ 2794.402631]  [<c157614d>] ? _raw_spin_lock_irqsave+0x2d/0x40
[ 2794.402642]  [<c10af51b>] handle_irq_event+0x3b/0x60
[ 2794.402654]  [<c10b1cc0>] ? unmask_irq+0x30/0x30
[ 2794.402664]  [<c10b1d0e>] handle_fasteoi_irq+0x4e/0xd0
[ 2794.402671]  <IRQ>  [<c157d832>] ? do_IRQ+0x42/0xc0
[ 2794.402693]  [<c106e483>] ? __hrtimer_start_range_ns+0x163/0x400
[ 2794.402704]  [<c157d770>] ? common_interrupt+0x30/0x38
[ 2794.402716]  [<c107c1d4>] ? tick_nohz_stop_sched_tick+0x2b4/0x410
[ 2794.402728]  [<c10017da>] ? cpu_idle+0x6a/0xe0
[ 2794.402741]  [<c15455a5>] ? rest_init+0x5d/0x68
[ 2794.402754]  [<c1834771>] ? start_kernel+0x34d/0x353
[ 2794.402764]  [<c18343b5>] ? pass_bootoption.constprop.2+0xe2/0xe2
[ 2794.402776]  [<c18340a9>] ? i386_start_kernel+0xa9/0xaf
[ 2794.402782] handlers:
[ 2794.402795] [<c13deb10>] usb_hcd_irq
[ 2794.402810] Disabling IRQ #16


** Attachment added: "dmesg.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1094904/+attachment/3471443/+files/dmesg.log

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https://bugs.launchpad.net/bugs/1094904

Title:
  irq 16: nobody cared usb_hcd_irq

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