sergio@sergio-Inspiron-N5110:~$ dmesg | grep usb
[    0.695685] usbcore: registered new interface driver usbfs
[    0.695694] usbcore: registered new interface driver hub
[    0.695720] usbcore: registered new device driver usb
[    1.594760] usb 1-1: new high speed USB device number 2 using ehci_hcd
[    1.838405] usb 2-1: new high speed USB device number 2 using ehci_hcd
[    2.042240] usb 1-1.5: new high speed USB device number 3 using ehci_hcd
[    2.489558] usb 2-1.6: new high speed USB device number 3 using ehci_hcd
[    2.857614] usbcore: registered new interface driver uas
[    2.858146] usbcore: registered new interface driver usb-storage
[    2.875560] scsi6 : usb-storage 2-1.6:1.0
[    2.875603] usbcore: registered new interface driver ums-realtek
[    3.081921] usb 2-1.6: USB disconnect, device number 3
[   17.228291] input: Laptop_Integrated_Webcam_HD as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.5/1-1.5:1.0/input/input6
[   17.228356] usbcore: registered new interface driver uvcvideo
[  285.563902] usb 1-1.4: new full speed USB device number 4 using ehci_hcd
[  285.794590] usbcore: registered new interface driver btusb
[  717.624197] usb usb1: root hub lost power or was reset
[  717.624328] usb usb2: root hub lost power or was reset
[  717.627069] usb usb3: root hub lost power or was reset
[  717.627071] usb usb4: root hub lost power or was reset
[  717.972732] usb 1-1: reset high speed USB device number 2 using ehci_hcd
[  718.216468] usb 2-1: reset high speed USB device number 2 using ehci_hcd
[  718.420392] usb 1-1.5: reset high speed USB device number 3 using ehci_hcd
[  718.584301] usb 1-1.4: reset full speed USB device number 4 using ehci_hcd
[  718.679008] btusb 1-1.4:1.0: no reset_resume for driver btusb?
[  718.679016] btusb 1-1.4:1.1: no reset_resume for driver btusb?
[  718.679199] PM: restore of drv:usb dev:1-1.4:1.0 complete after 1051.614 msecs
[  718.679208] PM: restore of drv:usb dev:1-1.4:1.1 complete after 1051.570 msecs
[21345.372181] usb usb1: root hub lost power or was reset
[21345.373239] usb usb2: root hub lost power or was reset
[21345.373955] usb usb3: root hub lost power or was reset
[21345.373957] usb usb4: root hub lost power or was reset
[21345.723430] usb 1-1: reset high speed USB device number 2 using ehci_hcd
[21345.971062] usb 2-1: reset high speed USB device number 2 using ehci_hcd
[21346.174882] usb 1-1.4: reset full speed USB device number 4 using ehci_hcd
[21346.269607] btusb 1-1.4:1.0: no reset_resume for driver btusb?
[21346.269615] btusb 1-1.4:1.1: no reset_resume for driver btusb?
[21346.269809] PM: restore of drv:usb dev:1-1.4:1.1 complete after 893.864 msecs
[21346.269816] PM: restore of drv:usb dev:1-1.4:1.0 complete after 893.926 msecs
[21346.338628] usb 1-1.5: reset high speed USB device number 3 using ehci_hcd
[25632.722426] usb 4-2: new SuperSpeed USB device number 2 using xhci_hcd
[25632.742284] scsi7 : usb-storage 4-2:1.0
[25965.239212] usb 2-1.2: new high speed USB device number 4 using ehci_hcd
[25965.340059] scsi8 : usb-storage 2-1.2:1.0
[27422.828288] usb 2-1.2: USB disconnect, device number 4
[27426.083177] usb 4-2: USB disconnect, device number 2
[27870.413369] usb 3-2: new high speed USB device number 2 using xhci_hcd
[27870.437647] usb 3-2: ep 0x81 - rounding interval to 32768 microframes, ep desc says 0 microframes
[27870.437664] usb 3-2: ep 0x2 - rounding interval to 32768 microframes, ep desc says 0 microframes
[27870.439067] scsi9 : usb-storage 3-2:1.0
[28147.511215] usb 3-2: USB disconnect, device number 2
[28147.808215] usb 3-2: new high speed USB device number 3 using xhci_hcd
[28147.832671] usb 3-2: ep 0x81 - rounding interval to 32768 microframes, ep desc says 0 microframes
[28147.832700] usb 3-2: ep 0x2 - rounding interval to 32768 microframes, ep desc says 0 microframes
[28147.833888] scsi10 : usb-storage 3-2:1.0
[29528.168114] usb usb1: root hub lost power or was reset
[29528.168162] usb usb2: root hub lost power or was reset
[29528.168477] usb usb3: root hub lost power or was reset
[29528.168478] usb usb4: root hub lost power or was reset
[29528.512740] PM: restore of drv:usb-storage dev:3-2:1.0 complete after 340.401 msecs
[29528.516583] usb 1-1: reset high speed USB device number 2 using ehci_hcd
[29528.760251] usb 2-1: reset high speed USB device number 2 using ehci_hcd
[29528.964026] usb 1-1.5: reset high speed USB device number 3 using ehci_hcd
[29529.127801] usb 1-1.4: reset full speed USB device number 4 using ehci_hcd
[29529.222426] btusb 1-1.4:1.0: no reset_resume for driver btusb?
[29529.222434] btusb 1-1.4:1.1: no reset_resume for driver btusb?
[29529.222621] PM: restore of drv:usb dev:1-1.4:1.0 complete after 1051.472 msecs
[29529.222625] PM: restore of drv:usb dev:1-1.4:1.1 complete after 1051.417 msecs
[29529.431285] usb 3-1: new high speed USB device number 4 using xhci_hcd
[29529.460144] usb 3-2: USB disconnect, device number 3
[29529.615148] usb 4-2: new SuperSpeed USB device number 4 using xhci_hcd
[29529.634949] scsi11 : usb-storage 4-2:1.0
[29529.731237] usb 3-1.1: new high speed USB device number 5 using xhci_hcd
[29530.030533] usb 3-1.1.1: new low speed USB device number 6 using xhci_hcd
[29530.054982] usb 3-1.1.1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[29530.126396] usb 3-1.1.2: new low speed USB device number 7 using xhci_hcd
[29530.152091] usb 3-1.1.2: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[29530.152097] usb 3-1.1.2: ep 0x82 - rounding interval to 64 microframes, ep desc says 80 microframes
[29530.173039] input: Logitech Optical USB Mouse as /devices/pci0000:00/0000:00:1c.4/0000:0b:00.0/usb3/3-1/3-1.1/3-1.1.1/3-1.1.1:1.0/input/input13
[29530.173173] generic-usb 0003:046D:C016.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on usb-0000:0b:00.0-1.1.1/input0
[29530.173244] usbcore: registered new interface driver usbhid
[29530.173246] usbhid: USB HID core driver
[29530.178839] input: Apple Inc. Apple Keyboard as /devices/pci0000:00/0000:00:1c.4/0000:0b:00.0/usb3/3-1/3-1.1/3-1.1.2/3-1.1.2:1.0/input/input14
[29530.178924] apple 0003:05AC:021E.0002: input,hidraw1: USB HID v1.11 Keyboard [Apple Inc. Apple Keyboard] on usb-0000:0b:00.0-1.1.2/input0
[29530.183015] input: Apple Inc. Apple Keyboard as /devices/pci0000:00/0000:00:1c.4/0000:0b:00.0/usb3/3-1/3-1.1/3-1.1.2/3-1.1.2:1.1/input/input15
[29530.183116] apple 0003:05AC:021E.0003: input,hidraw2: USB HID v1.11 Device [Apple Inc. Apple Keyboard] on usb-0000:0b:00.0-1.1.2/input1
[31116.194028] usb usb3: root hub lost power or was reset
[31116.194030] usb usb4: root hub lost power or was reset
[31116.316780] PM: resume of drv:usb-storage dev:4-2:1.0 complete after 121.692 msecs
[31116.444828] usb 1-1.5: reset high speed USB device number 3 using ehci_hcd
[31116.608463] usb 1-1.4: reset full speed USB device number 4 using ehci_hcd
[31116.703138] btusb 1-1.4:1.0: no reset_resume for driver btusb?
[31116.703146] btusb 1-1.4:1.1: no reset_resume for driver btusb?
[31116.703301] PM: resume of drv:usb dev:1-1.4:1.0 complete after 508.969 msecs
[31116.703313] PM: resume of drv:usb dev:1-1.4:1.1 complete after 508.924 msecs
[31116.812214] usb 3-1: reset high speed USB device number 4 using xhci_hcd
[31117.112304] usb 3-1.1: reset high speed USB device number 5 using xhci_hcd
[31117.599325] usb 3-1.1.2: reset low speed USB device number 7 using xhci_hcd
[31117.620302] usb 3-1.1.2: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[31117.620312] usb 3-1.1.2: ep 0x82 - rounding interval to 64 microframes, ep desc says 80 microframes
[31117.623322] PM: resume of drv:usbhid dev:3-1.1.2:1.0 complete after 1429.965 msecs
[31117.623333] PM: resume of drv:usbhid dev:3-1.1.2:1.1 complete after 1429.936 msecs
[31117.874914] usb 3-1.1.1: reset low speed USB device number 6 using xhci_hcd
[31117.894406] usb 3-1.1.1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[31117.897100] PM: resume of drv:usbhid dev:3-1.1.1:1.0 complete after 1704.206 msecs
[31118.793281] usb 2-1.6: new high speed USB device number 5 using ehci_hcd
[31118.920902] scsi12 : usb-storage 2-1.6:1.0
[31118.921219] usb 4-2: USB disconnect, device number 4
[31119.180769] usb 4-2: new SuperSpeed USB device number 5 using xhci_hcd
[31119.200785] scsi13 : usb-storage 4-2:1.0
[31119.219230] usb 2-1.6: USB disconnect, device number 5
[31442.479140] usb 2-1.6: new high speed USB device number 6 using ehci_hcd
[31442.603226] scsi14 : usb-storage 2-1.6:1.0
[31956.897147] usb 2-1.6: USB disconnect, device number 6
[31959.141591] usb 2-1.6: new high speed USB device number 7 using ehci_hcd
[31960.756234] scsi15 : usb-storage 2-1.6:1.0
[31960.756721] usb 2-1.6: USB disconnect, device number 7
[31961.442143] usb 2-1.6: new high speed USB device number 8 using ehci_hcd
[31961.566370] scsi16 : usb-storage 2-1.6:1.0
[32314.512163] usb 4-2: USB disconnect, device number 5
[32371.483507] usb 2-1.2: new high speed USB device number 9 using ehci_hcd
[32371.584384] scsi17 : usb-storage 2-1.2:1.0
[32423.654752] usb 2-1.2: USB disconnect, device number 9
[32424.875991] usb 2-1.2: new high speed USB device number 10 using ehci_hcd
[32424.976895] scsi18 : usb-storage 2-1.2:1.0
[33272.816088] usb 2-1.6: USB disconnect, device number 8
[40301.787342] usb 2-1.2: USB disconnect, device number 10
[44002.069321] usb usb1: root hub lost power or was reset
[44002.070254] usb usb2: root hub lost power or was reset
[44002.071974] usb usb3: root hub lost power or was reset
[44002.071975] usb usb4: root hub lost power or was reset
[44002.193108] PM: restore of drv:usbhid dev:3-1.1.1:1.0 complete after 119.252 msecs
[44002.193113] PM: restore of drv:usbhid dev:3-1.1.2:1.0 complete after 119.186 msecs
[44002.193120] PM: restore of drv:usbhid dev:3-1.1.2:1.1 complete after 119.159 msecs
[44002.420736] usb 1-1: reset high speed USB device number 2 using ehci_hcd
[44002.671189] usb 2-1: reset high speed USB device number 2 using ehci_hcd
[44002.876261] usb 1-1.4: reset full speed USB device number 4 using ehci_hcd
[44002.970977] btusb 1-1.4:1.0: no reset_resume for driver btusb?
[44002.970984] btusb 1-1.4:1.1: no reset_resume for driver btusb?
[44002.971226] PM: restore of drv:usb dev:1-1.4:1.1 complete after 898.745 msecs
[44002.971232] PM: restore of drv:usb dev:1-1.4:1.0 complete after 898.817 msecs
[44003.039997] usb 1-1.5: reset high speed USB device number 3 using ehci_hcd
[44003.395728] usb 3-1: USB disconnect, device number 4
[44003.395731] usb 3-1.1: USB disconnect, device number 5
[44003.395733] usb 3-1.1.1: USB disconnect, device number 6
[44003.443349] usb 3-1.1.2: USB disconnect, device number 7
sergio@sergio-Inspiron-N5110:~$