[SOLVED] SCSI scanner not detected by XSane

[szilagyic]

Hello:

I've got a SCSI scanner that is being detected by the kernel on Fedora 14, but XSane does not see it. If I run "sane-find-scanner" it says that no SCSI or USB scanners are found.

The scanner is a Cacham Splendeur 3024, model VM3552. I believe this scanner is the same as the Relisys Scorpio VM3552. In /var/log/messages, the following entries show up as soon as the scanner is warmed up:

Mar 11 13:34:45 dt kernel: [22595.116042] usb 4-2: new full speed USB device using uhci_hcd and address 41
Mar 11 13:34:45 dt kernel: [22595.230079] usb 4-2: device descriptor read/64, error -71
Mar 11 13:34:45 dt kernel: [22595.444048] usb 4-2: device descriptor read/64, error -71
Mar 11 13:34:46 dt kernel: [22595.647058] usb 4-2: new full speed USB device using uhci_hcd and address 42
Mar 11 13:34:46 dt kernel: [22595.760050] usb 4-2: device descriptor read/64, error -71
Mar 11 13:34:46 dt kernel: [22595.974045] usb 4-2: device descriptor read/64, error -71
Mar 11 13:34:46 dt kernel: [22596.177039] usb 4-2: new full speed USB device using uhci_hcd and address 43
Mar 11 13:34:47 dt kernel: [22596.585036] usb 4-2: device not accepting address 43, error -71
Mar 11 13:34:47 dt kernel: [22596.687038] usb 4-2: new full speed USB device using uhci_hcd and address 44
Mar 11 13:34:47 dt kernel: [22597.095032] usb 4-2: device not accepting address 44, error -71
Mar 11 13:34:47 dt kernel: [22597.095069] hub 4-0:1.0: unable to enumerate USB device on port 2

I am assuming there is some sort of SCSI to USB emulation going on? I don't know how these devices are supported now, but either way I'm guessing there is some issue based on the messages here. But I really don't know how to proceed from here. If somebody could point me in the right direction, I would greatly appreciate it! I've looked around and so far haven't been able to find a solution.

Thanks.

[SiliconSlick]

Given the model I'd say check 'man sane-teco3'. Appears it is very alpha.

I didn't see anything on the page that implies some routing via USB... if the messages appear only when trying to access a SCSI bus then I'd worry about interrupts and what not... but it may just be searching USB instead. AFAIK, SCSI is not being routed via USB for most SCSI devices. But that scanner may be different.

SS

[szilagyic]

Thank you for the help. It turns out that the USB messages I was seeing in /var/log/messages were NOT the scanner. It just happens that they appeared at the same exact time that the scanner was switched on. I ended up discovering that the scanner was detected properly by the kernel when the scanner was ON and we rebooted the PC:

[ 5.031335] scsi 3:0:4:0: Scanner Flat-bed scanner 5.08 PQ: 0 ANSI: 2

Next I edited /etc/sane.d/teco3.conf, and added the line at the bottom as: /dev/sg4 (/var/log/messages showed that it mounted the scanner as this device). Opened XSane and it works great!!

Now, I cannot figure out how to have the kernel find the scanner when the scanner is OFF and the PC is booted up. The "aic7xxx" module is loaded during boot (for the Adaptec SCSI controller). Is there some other module that needs to be loaded for the kernel to see the scanner? I tried running "modprobe sg" and that didn't do anything. So far I can't figure out this last piece of the puzzle.

Thanks!

[SiliconSlick]

You might check out this:

http://docs.fedoraproject.org/en-US/...-scsi-bus.html

Also Google "Fedora SCSI bus rescan". I've seen references to writing some values to some /sys/bus/scsi but I'm not sure what it is correct for current kernels.

Although the link above is primarily for LUN detection on RAIDs if it rescans the SCSI bus it might accomplish your needs.

SS (who assumes you already have lsscsi installed and have been using it to diagnose)

[szilagyic]

Thanks much. Well, that was the fix. It turns out that SCSI scanners can't be automatically detected after the kernel boots (that I know of). The fix is to run the /usr/bin/rescan-scsi-bus.sh script, that is provided by the "sg3_utils" rpm package from Fedora. I ended up creating a script in my home folder for Simple Scan, as:

#!/bin/sh
/usr/bin/sudo /usr/bin/rescan-scsi-bus.sh
simple-scan

So that it will automatically scan the SCSI bus before running Simple Scan. Changed the command line for the "Simple Scan" menu item to:

gnome-terminal –command="/home/myhomefolder/.simple-scan.sh”

Then gave permissions to the regular user with sudo by editing /etc/sudoers and putting a line at the bottom:

myusername ALL=NOPASSWD: /usr/bin/rescan-scsi-bus.sh

Works great.

Thank you for your help!!

[chicagocoyote]

Originally Posted by szilagyic

... I ended up discovering that the scanner was detected properly by the kernel when the scanner was ON and we rebooted the PC:

[ 5.031335] scsi 3:0:4:0: Scanner Flat-bed scanner 5.08 PQ: 0 ANSI: 2

Next I edited /etc/sane.d/teco3.conf, and added the line at the bottom as: /dev/sg4 (/var/log/messages showed that it mounted the scanner as this device). Opened XSane and it works great!!

Can you post the _exact_ line that you put in the .conf file?

Thanks

[szilagyic]

Originally Posted by chicagocoyote

Can you post the _exact_ line that you put in the .conf file?

Thanks

Yes, it is simply :

/dev/sg4

and that's it. Just add that at the bottom of the file and save it.