Why doesn't Ubuntu 9.10 detect my USB devices?

sean_hurly · 02-18-2011, 09:33 PM

sorry, i took this too far regarding the mknod, but for the sake of completeness.
(do NOT do it on your system)

iff i had written a suitable block driver:

sudo mknod /dev/example -b 250 0
ls -l /dev ( to check if it happened )
sudo mkdir /mnt/myexample
sudo mount -t ext2 /dev/example /mnt/myexample

summary,in response to your initial question: Why doesn't Ubuntu 9.10 detect my USB devices?
the kernel did detect your usb device ( the "dmesg" exercise ) but did not mount it (the "diff file1.dmp file2.dmp" exercise)

cat /etc/fstab provides a list of filesystems, partitions, and devices that MAY be automatically/manually mounted.
cat /etc/mtab shows what is currently mounted.

decide if you need to upgrade your OS or if you have an "odd" usb device

LAPIII · 02-19-2011, 08:29 AM

I don't want to upgrade my OS. What are your instructions now? What does this output of cat /etc/mtab say:

Code:

/dev/sda1 / ext4 rw,errors=remount-ro 0 0
proc /proc proc rw 0 0
none /sys sysfs rw,noexec,nosuid,nodev 0 0
none /sys/fs/fuse/connections fusectl rw 0 0
none /sys/kernel/debug debugfs rw 0 0
none /sys/kernel/security securityfs rw 0 0
udev /dev tmpfs rw,mode=0755 0 0
none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
none /dev/shm tmpfs rw,nosuid,nodev 0 0
none /var/run tmpfs rw,nosuid,mode=0755 0 0
none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0
none /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0
none /var/lib/ureadahead/debugfs debugfs rw 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0
gvfs-fuse-daemon /home/lapiii/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=lapiii 0 0

stress_junkie · 02-19-2011, 09:27 AM

@Advise_Pro, you have not identified exactly what USB device is involved. You should state the exact brand, model, and expected function of the USB device.

LAPIII · 02-19-2011, 12:20 PM

keyboard, no name brand
mouse, kensington Optical Elite
printer, canon MP600
webcam, Logitech Quickcam STX
wireless keypad, Targus Stow-N-Go Keypad
external HDD enclosure, Startech eSATA USB 2.0 to IDE SATA

stress_junkie · 02-19-2011, 12:42 PM

We can see from your previous posts in this discussion that most of these USB devices are detected and identified correctly. Are you saying that none of them are working? You appear to be using them to post in this forum. Which, if any, of the USB devices are not working?

LAPIII · 02-19-2011, 12:55 PM

No they work, Sean pointed out that the kernel isn't recognising them and that they must be mouted.

stress_junkie · 02-19-2011, 02:34 PM

Quote:

Originally Posted by Advice Pro

No they work, Sean pointed out that the kernel isn't recognising them and that they must be mouted.

I think there is a misunderstanding. If a device is working then there is no problem. You don't need to mount mice, keyboards, or various other devices. You only need to mount a file system (on a disk for example). These other devices are automatically handled by their device drivers. You don't have to do anything unless one of them isn't working.

sean_hurly · 02-20-2011, 06:47 PM

perhaps a bit more thought about the commands?: cat /proc/self/mountstats

LAPIII · 02-22-2011, 07:38 AM

Quote:

Originally Posted by sean_hurly

perhaps a bit more thought about the commands?: cat /proc/self/mountstats

What for? I just want to mount the usb devices. Please guide me on how to do so!

sean_hurly · 02-23-2011, 02:57 AM

"No they work" : your words!

Why do you want to mount them, they are already?

LAPIII · 02-27-2011, 02:25 PM

Quote:

Originally Posted by sean_hurly

Why do you want to mount them, they are already?

Quote:

Originally Posted by sean_hurly

summary,in response to your initial question: Why doesn't Ubuntu 9.10 detect my USB devices?
the kernel did detect your usb device ( the "dmesg" exercise ) but did not mount it (the "diff file1.dmp file2.dmp" exercise)

Quote:

Originally Posted by sean_hurly

summary,in response to your initial question: Why doesn't Ubuntu 9.10 detect my USB devices?
the kernel did detect your usb device ( the "dmesg" exercise ) but did not mount it (the "diff file1.dmp file2.dmp" exercise)

cat /etc/fstab provides a list of filesystems, partitions, and devices that MAY be automatically/manually mounted.
cat /etc/mtab shows what is currently mounted.

This is the output of cat /etc/fstab:

Code:

# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
# / was on /dev/sda1 during installation
UUID=01fc29b5-aca0-4830-80f9-7cf826c46274 /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda5 during installation
UUID=40d709cd-7845-4e06-ab81-68cdc186bc6a none            swap    sw              0       0
/dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0       0

And cat /etc/mtab:

Code:

/dev/sda1 / ext4 rw,errors=remount-ro 0 0
proc /proc proc rw 0 0
none /sys sysfs rw,noexec,nosuid,nodev 0 0
none /sys/fs/fuse/connections fusectl rw 0 0
none /sys/kernel/debug debugfs rw 0 0
none /sys/kernel/security securityfs rw 0 0
udev /dev tmpfs rw,mode=0755 0 0
none /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0
none /dev/shm tmpfs rw,nosuid,nodev 0 0
none /var/run tmpfs rw,nosuid,mode=0755 0 0
none /var/lock tmpfs rw,noexec,nosuid,nodev 0 0
none /lib/init/rw tmpfs rw,nosuid,mode=0755 0 0
binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0
gvfs-fuse-daemon /home/lapiii/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=lapiii 0 0

sean_hurly · 02-28-2011, 01:42 AM

and what did the: diff file1.dmp file2.dmp display? please remember to generate file1 before plugging in the device and file2 after plugging in the device.

LAPIII · 02-28-2011, 08:30 AM

How do you run the diff command?
Would it make a difference if for file1.dmp, I need to keep the usb keyboard & mouse in or must I adapt ps/2 devices?
There are no differences between file1.dmp and file2.dmp, they're both:

Code:

device rootfs mounted on / with fstype rootfs
device none mounted on /sys with fstype sysfs
device none mounted on /proc with fstype proc
device udev mounted on /dev with fstype tmpfs
device /dev/disk/by-uuid/01fc29b5-aca0-4830-80f9-7cf826c46274 mounted on / with fstype ext4
device none mounted on /sys/kernel/security with fstype securityfs
device none mounted on /sys/fs/fuse/connections with fstype fusectl
device none mounted on /sys/kernel/debug with fstype debugfs
device none mounted on /dev/pts with fstype devpts
device none mounted on /dev/shm with fstype tmpfs
device none mounted on /var/run with fstype tmpfs
device none mounted on /var/lock with fstype tmpfs
device none mounted on /lib/init/rw with fstype tmpfs
device binfmt_misc mounted on /proc/sys/fs/binfmt_misc with fstype binfmt_misc
device gvfs-fuse-daemon mounted on /home/lapiii/.gvfs with fstype fuse.gvfs-fuse-daemon

sean_hurly · 02-28-2011, 12:03 PM

try this from your terminal:

echo '123' > file1.tmp
echo '123' > file2.tmp
diff file1.tmp file2.tmp

echo '234' > file2.tmp
diff file1.tmp file2.tmp

does that help you?

LAPIII · 02-28-2011, 12:41 PM

file1.tmp + file2.tmp are the same, both files consist of

Quote:

123

After echo '234' > file2.tmp, diff output

Code:

1c1
< 123
---
> 234