# Re: No /dev/sg*, no scanner found, with Linux 2.4.1

From: Damon McGraw (damon@watchland.org)
Date: Thu Feb 15 2001 - 19:01:22 PST

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  You need to create the SCSI generic nodes in /dev.
  try:
  cd /dev
  MAKEDEV sg

  hope that helps,
  Damon

  ++ 15/02/01 17:47 -0800 - David M. Anderson:
  > SANE doesn't seem to find my scanner, but I don't think the problem is
  > really with SANE. Nevertheless, this seems to be a good place to ask
  > about scanners and Linux. Perhaps someone can help me.
  >
  > Running Debian GNU/Linux 2.2, with a compiled 2.4.1 kernel. Among other
  > things, SCSI generic support is enabled.
  >
  > Possibly relevant portions of output from "dmesg":
  > CPU: Intel Pentium II (Deschutes) stepping 02
  > Board Vendor: ASUSTeK Computer INC..
  > Board Name: P2L97-S.
  > Board Version: REV 1.xx.
  > SCSI subsystem driver Revision: 1.00
  > PCI: Found IRQ 9 for device 00:06.0
  > PCI: The same IRQ used for device 00:04.2
  > (scsi0) <Adaptec AIC-7880 Ultra SCSI host adapter> found at PCI 0/6/0
  > (scsi0) Wide Channel, SCSI ID=7, 16/255 SCBs
  > (scsi0) Downloading sequencer code... 422 instructions downloaded
  > scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.2.1/5.2.0
  > <Adaptec AIC-7880 Ultra SCSI host adapter>
  > Vendor: UMAX Model: Astra 1200S Rev: V2.6
  > Type: Scanner ANSI SCSI revision: 02
  > Detected scsi generic sg3 at scsi0, channel 0, id 6, lun 0, type 6
  >
  > /proc/scsi/scsi includes:
  > Host: scsi0 Channel: 00 Id: 06 Lun: 00
  > Vendor: UMAX Model: Astra 1200S Rev: V2.6
  > Type: Scanner ANSI SCSI revision: 02
  >
  > /proc/scsi/sg/device_hdr:
  > host chan id lun type bopens qdepth busy
  >
  > /proc/scsi/sg/devices includes:
  > 0 0 6 0 6 0 3 0
  >
  > (I also three other SCSI devices, a Zip drive, Jaz drive, and CD-R, on
  > IDs 3, 4, and 5, but they seem to be working fine.)
  >
  > So it seems clear that the UMAX scanner is detected by the kernel, and
  > classified correctly as a scanner, sg3 in particular.
  >
  > /etc/sane.d/umax.conf:
  > scsi UMAX * Scanner
  > scsi LinoHell Office
  > scsi LinoHell Office2
  > scsi LinoHell SAPHIR2
  > scsi Nikon AX-210
  > /dev/scanner
  >
  > /usr/lib/sane contains libsane-umax.so.1.0.1 (libsane-umax.so.1 links to
  > this).
  >
  > On the other hand:
  >
  > $ ls /dev/sg*
  > ls: /dev/sg*: No such file or directory
  >
  > $ sudo find-scanner -v
  > find-scanner: searching for scanners:
  > find-scanner: checking /dev/scanner... failed to open
  > find-scanner: checking /dev/sg0... failed to open
  > find-scanner: checking /dev/sg1... failed to open
  > find-scanner: checking /dev/sg2... failed to open
  > find-scanner: checking /dev/sg3... failed to open
  > find-scanner: checking /dev/sg4... failed to open
  > ...
  >
  > $ scanimage --list-devices
  >
  > I am obviously missing something. Does anyone know what it is?
  >
  > Thanks,
  > Dave
  >
  >
  >
  > --
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