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Lab 8.1

Posts: 11
edited December 2016 in LFS201 Class Forum - Discontinued

Hi,

Following instructions for Lab 8.1 verbatim doesn't work for me.   At step 3 after connecting a usb drive and doing `ls -lF /dev | grep myusb` nothing is returned.

I've tried two different thumb-drives, a wireless modem dongle, and a webcam. 

Thanks in advance for any help.

Lex

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Comments

  • Posts: 1,276
    edited December 2016

    Hi Lex,

    1) What distro and version are you using?

    2) When connecting the usb device, please do 'dmesg' and attach the output of it.

    Thanks,

    Luis.

  • Posts: 11

    Hi Luis,

    I'm using CentOS 7, 3.10.0-514.2.2.el7.x86_64.


    1. [62356.297197] usb 1-1.4: new high-speed USB device number 4 using ehci-pci
    2. [62356.384331] usb 1-1.4: New USB device found, idVendor=0781, idProduct=5581
    3. [62356.384336] usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
    4. [62356.384339] usb 1-1.4: Product: SanDisk Ultra
    5. [62356.384341] usb 1-1.4: Manufacturer: SanDisk
    6. [62356.384343] usb 1-1.4: SerialNumber: A20037B0BA063325
    7. [62356.409203] usb-storage 1-1.4:1.0: USB Mass Storage device detected
    8. [62356.409693] scsi host10: usb-storage 1-1.4:1.0
    9. [62356.409819] usbcore: registered new interface driver usb-storage
    10. [62356.411807] usbcore: registered new interface driver uas
    11. [62357.412088] scsi 10:0:0:0: Direct-Access     SanDisk  SanDisk Ultra    PMAP PQ: 0 ANSI: 6
    12. [62357.412901] sd 10:0:0:0: Attached scsi generic sg8 type 0
    13. [62357.413208] sd 10:0:0:0: [sdh] 30283008 512-byte logical blocks: (15.5 GB/14.4 GiB)
    14. [62357.413902] sd 10:0:0:0: [sdh] Write Protect is off
    15. [62357.413907] sd 10:0:0:0: [sdh] Mode Sense: 45 00 00 00
    16. [62357.414671] sd 10:0:0:0: [sdh] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
    17. [62357.589459]  sdh: sdh1
    18. [62357.592264] sd 10:0:0:0: [sdh] Attached SCSI removable disk

    Cheers mate.

    Lex

  • Posts: 11
    edited December 2016

    This may also be useful:


    1. ➜  ~ udevadm monitor --subsystem-match=usb --property
    2. monitor will print the received events for:
    3. UDEV - the event which udev sends out after rule processing
    4. KERNEL - the kernel uevent
    6. KERNEL[62360.178801] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4 (usb)
    7. ACTION=add
    8. BUSNUM=001
    9. DEVNAME=/dev/bus/usb/001/004
    10. DEVNUM=004
    11. DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4
    12. DEVTYPE=usb_device
    13. MAJOR=189
    14. MINOR=3
    15. PRODUCT=781/5581/110
    16. SEQNUM=3285
    17. SUBSYSTEM=usb
    18. TYPE=0/0/0
    20. KERNEL[62360.179184] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0 (usb)
    21. ACTION=add
    22. DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0
    23. DEVTYPE=usb_interface
    24. INTERFACE=8/6/80
    25. MODALIAS=usb:v0781p5581d0110dc00dsc00dp00ic08isc06ip50in00
    26. PRODUCT=781/5581/110
    27. SEQNUM=3286
    28. SUBSYSTEM=usb
    29. TYPE=0/0/0
    31. UDEV  [62360.196401] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4 (usb)
    32. ACTION=add
    33. BUSNUM=001
    34. DEVLINKS=/dev/myusb
    35. DEVNAME=/dev/bus/usb/001/004
    36. DEVNUM=004
    37. DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4
    38. DEVTYPE=usb_device
    39. ID_BUS=usb
    40. ID_MODEL=SanDisk_Ultra
    41. ID_MODEL_ENC=SanDisk\x20Ultra
    42. ID_MODEL_FROM_DATABASE=Ultra
    43. ID_MODEL_ID=5581
    44. ID_REVISION=0110
    45. ID_SERIAL=SanDisk_SanDisk_Ultra_A20037B0BA063325
    46. ID_SERIAL_SHORT=A20037B0BA063325
    47. ID_USB_INTERFACES=:080650:
    48. ID_VENDOR=SanDisk
    49. ID_VENDOR_ENC=SanDisk
    50. ID_VENDOR_FROM_DATABASE=SanDisk Corp.
    51. ID_VENDOR_ID=0781
    52. MAJOR=189
    53. MINOR=3
    54. PRODUCT=781/5581/110
    55. SEQNUM=3285
    56. SUBSYSTEM=usb
    57. TYPE=0/0/0
    58. USEC_INITIALIZED=360181015
    60. UDEV  [62360.205815] add      /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0 (usb)
    61. ACTION=add
    62. DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0
    63. DEVTYPE=usb_interface
    64. ID_MODEL_FROM_DATABASE=Ultra
    65. ID_VENDOR_FROM_DATABASE=SanDisk Corp.
    66. INTERFACE=8/6/80
    67. MODALIAS=usb:v0781p5581d0110dc00dsc00dp00ic08isc06ip50in00
    68. PRODUCT=781/5581/110
    69. SEQNUM=3286
    70. SUBSYSTEM=usb
    71. TYPE=0/0/0
    72. USEC_INITIALIZED=182882



     

  • Posts: 1,276
    edited December 2016

    Hi Lex,

    So, the usb device is recognized by the OS.

    1) Did you create the udev rule?

    2) Did you reload the udev rules by restarting the udev service or rebooting the system?

    Regards,

    Luis.

  • Posts: 11
    edited December 2016

    Thanks Luis,

    It was 2.  I hadn't restarted the udev service.  As I have rebooted since starting this thread it is now working (you can see in my posted above... I didn't notice lol).

    For future reference, to reload udev rules without rebooting on CentOS 7:

     


    1. udevadm control --reload-rules

    Thanks again!

  • Posts: 1,276
    edited January 2017

    That's great, Lex, I'm glad that you were able to solve it :)

    Have a great 2017!

    Luis.

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