USB Recognition Problem

farslayer · 10-01-2008, 07:29 AM

no USB storage devices work..

Do you have a USB mouse ? if so does it work ?

Are the proper modules being loaded for USB storage devices ?

Code:

it-etch:~# lsmod | grep usb

usbserial              29128  1 pl2303
usbhid                 37248  0 
usb_storage            72000  0 
ide_core              110504  5 usb_storage,ide_generic,ide_cd,generic,atiixp
usbcore               112644  7 pl2303,usbserial,usbhid,usb_storage,ehci_hcd,ohci_hcd
scsi_mod              124168  5 sg,usb_storage,sd_mod,ahci,libata

ehci_hcd and ohci_hcd are usb controller drivers
usb_storage module is needed to support USB storage devices
sd_mod is a scsi disk driver used for scsi emulation for usb devices

When troubleshooting usb storage devices I typically issue this command before plugging in the device. I can then see what the system is doing when it tries to detect the device and make it operational.

Code:


tail -f /var/log/mesages

Oct  1 08:23:24 it-etch kernel: usb 6-7: new high speed USB device using ehci_hcd and address 11
Oct  1 08:23:24 it-etch kernel: usb 6-7: configuration #1 chosen from 1 choice
Oct  1 08:23:24 it-etch kernel: scsi10 : SCSI emulation for USB Mass Storage devices
Oct  1 08:23:29 it-etch kernel:   Vendor: USB 2.0   Model: Flash Disk        Rev: 1100
Oct  1 08:23:29 it-etch kernel:   Type:   Direct-Access                      ANSI SCSI revision: 00
Oct  1 08:23:29 it-etch kernel: SCSI device sdb: 3963904 512-byte hdwr sectors (2030 MB)
Oct  1 08:23:29 it-etch kernel: sdb: Write Protect is off
Oct  1 08:23:29 it-etch kernel: SCSI device sdb: 3963904 512-byte hdwr sectors (2030 MB)
Oct  1 08:23:29 it-etch kernel: sdb: Write Protect is off
Oct  1 08:23:29 it-etch kernel:  sdb: sdb1
Oct  1 08:23:29 it-etch kernel: sd 10:0:0:0: Attached scsi removable disk sdb
Oct  1 08:23:29 it-etch kernel: sd 10:0:0:0: Attached scsi generic sg1 type 0

I have had systems that would dynamically load the usb_storage module when a device was connected.

so... aer the proper modules loaded on your system ?
what does your messaeg log look like when you connect the device ?

CmK · 10-02-2008, 08:06 PM

No I do not have a usb mouse. I plugged in the USB and tried the lsmod | grep usb and suddenly it mounted and worked! I have no idea why. Now ever now and then it goes away and comes back but it's there most of the time now. I have no idea why suddenly it is working. Do you have any idea what would cause it to suddenly work? here is the outputs, but i would imagine they look fine now that its working

chris@chris-laptop:~$ lsmod | grep usb
usb_storage 73664 1
libusual 19108 1 usb_storage
scsi_mod 151436 5 usb_storage,sg,sr_mod,sd_mod,libata
usbcore 146028 5 usb_storage,libusual,ehci_hcd,uhci_hcd
chris@chris-laptop:~$

chris@chris-laptop:~$ tail -f /var/log/messages
Oct 2 20:55:40 chris-laptop kernel: [ 1041.161990] usb 4-4: configuration #1 chosen from 1 choice
Oct 2 20:55:40 chris-laptop kernel: [ 1041.207144] scsi6 : SCSI emulation for USB Mass Storage devices
Oct 2 20:55:45 chris-laptop kernel: [ 834.792071] scsi 6:0:0:0: Direct-Access WD 1600BEV External 1.04 PQ: 0 ANSI: 4
Oct 2 20:55:45 chris-laptop kernel: [ 834.807056] sd 6:0:0:0: [sdb] 312581808 512-byte hardware sectors (160042 MB)
Oct 2 20:55:45 chris-laptop kernel: [ 834.807891] sd 6:0:0:0: [sdb] Write Protect is off
Oct 2 20:55:45 chris-laptop kernel: [ 834.809137] sd 6:0:0:0: [sdb] 312581808 512-byte hardware sectors (160042 MB)
Oct 2 20:55:45 chris-laptop kernel: [ 834.810014] sd 6:0:0:0: [sdb] Write Protect is off
Oct 2 20:55:45 chris-laptop kernel: [ 834.810029] sdb: sdb1
Oct 2 20:55:45 chris-laptop kernel: [ 834.857762] sd 6:0:0:0: [sdb] Attached SCSI disk
Oct 2 20:55:45 chris-laptop kernel: [ 834.857829] sd 6:0:0:0: Attached scsi generic sg2 type 0

Thanks for all your help guys...If anyone could explain what happened I would really appreciate it

CmK · 10-02-2008, 08:27 PM

OK so its been about 5 min from last last post and the darn thing just disappeared. Why would it recognize and mount the drive one min then drop it the next?

forum1793 · 10-02-2008, 09:25 PM

Could something be going to sleep and not waking up?

CmK · 10-02-2008, 10:06 PM

Something going to sleep? like what? So on a whim I took out my Int HDD, CD Drive and Batt and sprayed the insides out with a a can of dry air, turned the computer back on and now its appearing and disappearing about every 3 min. I am starting to think I have a physical bad connection somewhere

farslayer · 10-02-2008, 10:10 PM

Bad USB Cable ?

Have you tried different USB ports on the computer ? I've had systems where the ports on the front of the PC caused problems but the ones on the rear worked fine. Nothing like having the PC spontaneously reboot whenever I plugged anything into the port on the front.

I doubt usbview will help with an intermittent connection, but it might provide some information.