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Old 05-06-2006, 10:17 AM   #1
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diagnosing usb card-reader non-functionality

So I have some generic USB 2.0 multi (12? 9?) camera card reader.

It used to work just fine. Isn't that how all stories start? Then the auto-detect and GUI mounting went wacky. Sometimes I could get this fixed, sometimes not. I could however get it mounted, and at least copy stuff via commandline.

No longer.

I don't even get it to change from a red-LED to a green-LED when inserting my card. Card works in the camera for storing info, btw.

I've tried with a few other cards (all the same type, however), and nothing...

The last time the device was working, I'd just pulled it out of my computer to put on my friend's windows laptop, and successfully used it to pull data from my card.

So, how do I figure out if it's a hardware issue, or what?

I've got USB power, since the LED on the device is running.

I've tried:
sudo fdisk -l

I get nothing back on the USB stuff, which I assume means it's a hardware issue of some kind this time around...

If I'd gotten something back from fdisk, I should be trying:
sudo mount -t vfat /dev/sda1 /media/camera

If I get this error: mount: special device /dev/sda1 does not exist

I should try:
/etc/init.d/hotplug restart

Any other things I should be trying, as various steps in here?
Old 05-06-2006, 12:16 PM   #2
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Restarting the hotplug service is a good idea. Doing this will probably run a /etc/hotplug.d/usb.rc script. This will rmmod and modprobe kernel modules that are used for usb devices. I would recommend, that before you try it, you
  • Open up a terminal and run "sudo tail -f /var/log/messages", so you can watch the messages produced while the hotplug service is restarting.
  • run "sudo /sbin/lsmod >modlist_before.txt"
Afterwards, run "sudo /sbin/lsmod >modlist_after.txt". If restarting hotplugging is successful, and the cause was a missing kernel module, comparing the two lists could tell you which module wasn't being loaded when you boot up.

If you don't see messages in /var/log/messages when inserting the card into the reader, I would look at which usb related kernel modules are not loaded (using lsmod) rather than the setup for hotplugging or the udev configuration.

Last edited by jschiwal; 05-06-2006 at 12:24 PM.


hotplug, usb

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