Nov 29 23:57:46 luca-desktop kernel: [600904.320100] irq 21: nobody cared (try booting with the "irqpoll" option)
Nov 29 23:57:46 luca-desktop kernel: [600904.320112] Pid: 0, comm: swapper/0 Tainted: G        W    3.5.0-18-generic #29-Ubuntu
Nov 29 23:57:46 luca-desktop kernel: [600904.320114] Call Trace:
Nov 29 23:57:46 luca-desktop kernel: [600904.320127]  [<c10c6b39>] __report_bad_irq+0x29/0xd0
Nov 29 23:57:46 luca-desktop kernel: [600904.320131]  [<c10c6e05>] note_interrupt+0x175/0x1c0
Nov 29 23:57:46 luca-desktop kernel: [600904.320138]  [<c1036f35>] ? native_safe_halt+0x5/0x10
Nov 29 23:57:46 luca-desktop kernel: [600904.320146]  [<c10c4c2f>] handle_irq_event_percpu+0x9f/0x1d0
Nov 29 23:57:46 luca-desktop kernel: [600904.320150]  [<c10c7760>] ? unmask_irq+0x30/0x30
Nov 29 23:57:46 luca-desktop kernel: [600904.320158]  [<c15cb060>] ? nmi_stack_correct+0x2f/0x34
Nov 29 23:57:46 luca-desktop kernel: [600904.320162]  [<c10c4d9b>] handle_irq_event+0x3b/0x60
Nov 29 23:57:46 luca-desktop kernel: [600904.320166]  [<c10c7760>] ? unmask_irq+0x30/0x30
Nov 29 23:57:46 luca-desktop kernel: [600904.320169]  [<c10c77ae>] handle_fasteoi_irq+0x4e/0xd0
Nov 29 23:57:46 luca-desktop kernel: [600904.320171]  <IRQ>  [<c15d1c12>] ? do_IRQ+0x42/0xc0
Nov 29 23:57:46 luca-desktop kernel: [600904.320184]  [<c104ce0c>] ? irq_exit+0x5c/0xa0
Nov 29 23:57:46 luca-desktop kernel: [600904.320188]  [<c15d1cee>] ? smp_apic_timer_interrupt+0x5e/0x8d
Nov 29 23:57:46 luca-desktop kernel: [600904.320192]  [<c15d1a70>] ? common_interrupt+0x30/0x38
Nov 29 23:57:46 luca-desktop kernel: [600904.320196]  [<c1036f35>] ? native_safe_halt+0x5/0x10
Nov 29 23:57:46 luca-desktop kernel: [600904.320200]  [<c1017b66>] ? default_idle+0x46/0x190
Nov 29 23:57:46 luca-desktop kernel: [600904.320204]  [<c1018716>] ? cpu_idle+0xb6/0xe0
Nov 29 23:57:46 luca-desktop kernel: [600904.320212]  [<c15a0c35>] ? rest_init+0x5d/0x68
Nov 29 23:57:46 luca-desktop kernel: [600904.320218]  [<c18b09be>] ? start_kernel+0x35d/0x363
Nov 29 23:57:46 luca-desktop kernel: [600904.320222]  [<c18b04ed>] ? do_early_param+0x80/0x80
Nov 29 23:57:46 luca-desktop kernel: [600904.320225]  [<c18b0303>] ? i386_start_kernel+0xa6/0xad
Nov 29 23:57:46 luca-desktop kernel: [600904.320227] handlers:
Nov 29 23:57:46 luca-desktop kernel: [600904.320231] [<c142ff40>] usb_hcd_irq
Nov 29 23:57:46 luca-desktop kernel: [600904.320234] [<c142ff40>] usb_hcd_irq
Nov 29 23:57:46 luca-desktop kernel: [600904.320237] [<c142ff40>] usb_hcd_irq
Nov 29 23:57:46 luca-desktop kernel: [600904.320239] Disabling IRQ #21