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Environment: Dell XPS 15 (L502X), Ubuntu 13.04

Symptoms: Sporadically, the entire roster of USB devices is disconnected and reconnected. The /var/log/syslog entries are:

Sep 22 14:02:36 xps-l502x kernel: [25480.709993] usb 3-2.1: USB disconnect, device number 16
Sep 22 14:02:36 xps-l502x kernel: [25480.710006] usb 3-2.1.2: USB disconnect, device number 17
Sep 22 14:02:36 xps-l502x kernel: [25480.710013] usb 3-2.1.2.1: USB disconnect, device number 18
Sep 22 14:02:36 xps-l502x kernel: [25480.729436] usb 3-2.1.2.2: USB disconnect, device number 19
Sep 22 14:02:36 xps-l502x kernel: [25480.782935] usb 3-2.1.2.3: USB disconnect, device number 20
Sep 22 14:02:36 xps-l502x kernel: [25480.786629] usb 3-2.1.2.4: USB disconnect, device number 21
Sep 22 14:02:36 xps-l502x colord: device removed: sysfs-samsung-Galaxy_Nexus
Sep 22 14:02:36 xps-l502x kernel: [25480.999078] usb 3-2.1: new high-speed USB device number 22 using xhci_hcd
Sep 22 14:02:36 xps-l502x kernel: [25481.017320] usb 3-2.1: New USB device found, idVendor=2109, idProduct=2812
Sep 22 14:02:36 xps-l502x kernel: [25481.017331] usb 3-2.1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
Sep 22 14:02:36 xps-l502x kernel: [25481.017336] usb 3-2.1: Product: USB2.0 Hub       
Sep 22 14:02:36 xps-l502x kernel: [25481.018366] hub 3-2.1:1.0: USB hub found
Sep 22 14:02:36 xps-l502x kernel: [25481.018837] hub 3-2.1:1.0: 4 ports detected
Sep 22 14:02:37 xps-l502x kernel: [25481.310998] usb 3-2.1.2: new high-speed USB device number 23 using xhci_hcd
Sep 22 14:02:37 xps-l502x kernel: [25481.328937] usb 3-2.1.2: New USB device found, idVendor=1a40, idProduct=0201
Sep 22 14:02:37 xps-l502x kernel: [25481.328948] usb 3-2.1.2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
Sep 22 14:02:37 xps-l502x kernel: [25481.328953] usb 3-2.1.2: Product: USB 2.0 Hub [MTT]
Sep 22 14:02:37 xps-l502x kernel: [25481.329845] hub 3-2.1.2:1.0: USB hub found
Sep 22 14:02:37 xps-l502x kernel: [25481.330265] hub 3-2.1.2:1.0: 7 ports detected
Sep 22 14:02:37 xps-l502x kernel: [25481.602906] usb 3-2.1.2.1: new low-speed USB device number 24 using xhci_hcd
Sep 22 14:02:37 xps-l502x kernel: [25481.631411] usb 3-2.1.2.1: New USB device found, idVendor=1a7c, idProduct=0068
Sep 22 14:02:37 xps-l502x kernel: [25481.631421] usb 3-2.1.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Sep 22 14:02:37 xps-l502x kernel: [25481.631427] usb 3-2.1.2.1: Product: Evoluent VerticalMouse 3 
Sep 22 14:02:37 xps-l502x kernel: [25481.631432] usb 3-2.1.2.1: Manufacturer: Kingsis Peripherals 
Sep 22 14:02:37 xps-l502x kernel: [25481.640362] input: Kingsis Peripherals  Evoluent VerticalMouse 3  as /devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2/3-2.1/3-2.1.2/3-2.1.2.1/3-2.1.2.1:1.0/input/input148
Sep 22 14:02:37 xps-l502x kernel: [25481.640765] hid-generic 0003:1A7C:0068.0088: input,hidraw0: USB HID v1.10 Mouse [Kingsis Peripherals  Evoluent VerticalMouse 3 ] on usb-0000:04:00.0-2.1.2.1/input0
Sep 22 14:02:37 xps-l502x kernel: [25481.710675] usb 3-2.1.2.2: new low-speed USB device number 25 using xhci_hcd
Sep 22 14:02:37 xps-l502x kernel: [25481.764044] usb 3-2.1.2.2: New USB device found, idVendor=04f2, idProduct=0402
Sep 22 14:02:37 xps-l502x kernel: [25481.764050] usb 3-2.1.2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Sep 22 14:02:37 xps-l502x kernel: [25481.764052] usb 3-2.1.2.2: Product: USB Keyboard
Sep 22 14:02:37 xps-l502x kernel: [25481.764055] usb 3-2.1.2.2: Manufacturer: Chicony
Sep 22 14:02:37 xps-l502x kernel: [25481.764226] usb 3-2.1.2.2: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
Sep 22 14:02:37 xps-l502x kernel: [25481.764234] usb 3-2.1.2.2: ep 0x82 - rounding interval to 64 microframes, ep desc says 80 microframes
Sep 22 14:02:37 xps-l502x kernel: [25481.781398] input: Chicony USB Keyboard as /devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2/3-2.1/3-2.1.2/3-2.1.2.2/3-2.1.2.2:1.0/input/input149
Sep 22 14:02:37 xps-l502x kernel: [25481.781654] hid-generic 0003:04F2:0402.0089: input,hidraw1: USB HID v1.11 Keyboard [Chicony USB Keyboard] on usb-0000:04:00.0-2.1.2.2/input0
Sep 22 14:02:37 xps-l502x kernel: [25481.822268] input: Chicony USB Keyboard as /devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2/3-2.1/3-2.1.2/3-2.1.2.2/3-2.1.2.2:1.1/input/input150
Sep 22 14:02:37 xps-l502x kernel: [25481.822537] hid-generic 0003:04F2:0402.008A: input,hiddev0,hidraw2: USB HID v1.11 Device [Chicony USB Keyboard] on usb-0000:04:00.0-2.1.2.2/input1
Sep 22 14:02:37 xps-l502x kernel: [25481.894854] usb 3-2.1.2.3: new high-speed USB device number 26 using xhci_hcd
Sep 22 14:02:37 xps-l502x kernel: [25482.015691] usb 3-2.1.2.3: New USB device found, idVendor=11b0, idProduct=6348
Sep 22 14:02:37 xps-l502x kernel: [25482.015702] usb 3-2.1.2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Sep 22 14:02:37 xps-l502x kernel: [25482.015708] usb 3-2.1.2.3: Product: USB3.0 Media Reader
Sep 22 14:02:37 xps-l502x kernel: [25482.015713] usb 3-2.1.2.3: Manufacturer: Kingston
Sep 22 14:02:37 xps-l502x kernel: [25482.015717] usb 3-2.1.2.3: SerialNumber: 08735313900604
Sep 22 14:02:37 xps-l502x kernel: [25482.023351] scsi55 : usb-storage 3-2.1.2.3:1.0
Sep 22 14:02:37 xps-l502x kernel: [25482.094737] usb 3-2.1.2.4: new high-speed USB device number 27 using xhci_hcd
Sep 22 14:02:37 xps-l502x kernel: [25482.114421] usb 3-2.1.2.4: New USB device found, idVendor=04e8, idProduct=6860
Sep 22 14:02:37 xps-l502x kernel: [25482.114437] usb 3-2.1.2.4: New USB device strings: Mfr=2, Product=3, SerialNumber=4
Sep 22 14:02:37 xps-l502x kernel: [25482.114446] usb 3-2.1.2.4: Product: Galaxy Nexus
Sep 22 14:02:37 xps-l502x kernel: [25482.114451] usb 3-2.1.2.4: Manufacturer: samsung
Sep 22 14:02:37 xps-l502x kernel: [25482.114455] usb 3-2.1.2.4: SerialNumber: 0146975A11013006
Sep 22 14:02:37 xps-l502x mtp-probe: checking bus 3, device 25: "/sys/devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2/3-2.1/3-2.1.2/3-2.1.2.2"
Sep 22 14:02:37 xps-l502x mtp-probe: checking bus 3, device 26: "/sys/devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2/3-2.1/3-2.1.2/3-2.1.2.3"
Sep 22 14:02:37 xps-l502x mtp-probe: bus: 3, device: 26 was not an MTP device
Sep 22 14:02:37 xps-l502x mtp-probe: bus: 3, device: 25 was not an MTP device
Sep 22 14:02:37 xps-l502x mtp-probe: checking bus 3, device 24: "/sys/devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2/3-2.1/3-2.1.2/3-2.1.2.1"
Sep 22 14:02:37 xps-l502x mtp-probe: bus: 3, device: 24 was not an MTP device
Sep 22 14:02:37 xps-l502x colord: Device added: sysfs-samsung-Galaxy_Nexus
Sep 22 14:02:38 xps-l502x kernel: [25483.040922] scsi 55:0:0:0: Direct-Access              FCR-HS3       -0 1.00 PQ: 0 ANSI: 4
Sep 22 14:02:38 xps-l502x kernel: [25483.057615] scsi 55:0:0:1: Direct-Access              FCR-HS3       -1 1.00 PQ: 0 ANSI: 4
Sep 22 14:02:38 xps-l502x kernel: [25483.074508] scsi 55:0:0:2: Direct-Access              FCR-HS3       -2 1.00 PQ: 0 ANSI: 4
Sep 22 14:02:38 xps-l502x kernel: [25483.091462] scsi 55:0:0:3: Direct-Access              FCR-HS3       -3 1.00 PQ: 0 ANSI: 4
Sep 22 14:02:38 xps-l502x kernel: [25483.093043] sd 55:0:0:0: Attached scsi generic sg2 type 0
Sep 22 14:02:38 xps-l502x kernel: [25483.093546] sd 55:0:0:1: Attached scsi generic sg3 type 0
Sep 22 14:02:38 xps-l502x kernel: [25483.093988] sd 55:0:0:2: Attached scsi generic sg4 type 0
Sep 22 14:02:38 xps-l502x kernel: [25483.094593] sd 55:0:0:3: Attached scsi generic sg5 type 0
Sep 22 14:02:38 xps-l502x kernel: [25483.165391] sd 55:0:0:0: [sdb] Attached SCSI removable disk
Sep 22 14:02:38 xps-l502x kernel: [25483.168487] sd 55:0:0:1: [sdc] Attached SCSI removable disk
Sep 22 14:02:38 xps-l502x kernel: [25483.171167] sd 55:0:0:2: [sdd] Attached SCSI removable disk
Sep 22 14:02:38 xps-l502x kernel: [25483.173966] sd 55:0:0:3: [sde] Attached SCSI removable disk

This can happen every few minutes, particularly with a Galaxy Nexus plugged in, though it can occur even without this. For example, it happened just before I wrote this question, and it happened again while writing the question. While the disconnect/reconnect is going on, the mouse freezes, keyboard input is ignored, etc.

lsusb -t reports:

/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
    |__ Port 2: Dev 2, If 0, Class=hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 28, If 0, Class=hub, Driver=hub/4p, 480M
            |__ Port 2: Dev 29, If 0, Class=hub, Driver=hub/7p, 480M
                |__ Port 1: Dev 30, If 0, Class=HID, Driver=usbhid, 1.5M
                |__ Port 2: Dev 31, If 0, Class=HID, Driver=usbhid, 1.5M
                |__ Port 2: Dev 31, If 1, Class=HID, Driver=usbhid, 1.5M
                |__ Port 3: Dev 32, If 0, Class=stor., Driver=usb-storage, 480M
                |__ Port 4: Dev 33, If 0, Class=vend., Driver=, 480M
                |__ Port 4: Dev 33, If 1, Class=vend., Driver=usbfs, 480M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/8p, 480M
        |__ Port 5: Dev 3, If 0, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M
        |__ Port 5: Dev 3, If 1, Class='bInterfaceClass 0xe0 not yet handled', Driver=btusb, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
    |__ Port 1: Dev 2, If 0, Class=hub, Driver=hub/6p, 480M

I have a USB 3.0 hub plugged into a USB port on the notebook, and a USB 2.0 hub plugged into the USB 3.0 hub, and I have a few items (keyboard, mouse, Galaxy Nexus) plugged into the USB 2.0 hub. Note that I have already gone in and blocked auto-mounting, as that was driving me nuts as the MTP mount for the Galaxy Nexus would automatically spring back up.

This USB hub and device setup worked fine on an Ubuntu 11.10 environment, from a similarly spec'd L502X, so the hubs and other devices presumably are fine.

Are there known issues with 13.04 and USB that I should know about? Or is this possibly a problem with the USB port of the L502X that I am using? Or something else?

Thanks!

share|improve this question
    
probably a bug trying to work around bunk usb devices that go to sleep when not accessed periodically. if they die, it might try to re-init usb. just a guess...so it's a comment not an answer. –  hbdgaf Oct 5 '13 at 14:20
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