# Re: No scanners identified

From: Jochen Eisinger (jochen.eisinger@gmx.de)
Date: Wed Mar 07 2001 - 02:28:22 PST

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  Hi!

  [Eddy De Greef]
  > > It appears to me that the problem is connected to wrong access rights.
  > > However, it's not the parallel port, since I can both read and write to
  > > it, for instance with "echo Hello > /dev/lp0".
  > > The string will then appear on the printer also connected to the port.
  >
  > The backend doesn't access the port in that way, I believe. All
  > communication with the parallel is performed at the IO-port level
  > (ie., IO-ports at addresses 0x380 etc).
  > The permissions on /dev/lp0 therefore don't affect the backend.
  > A process trying to access the IO-ports must have super-user
  > access rights. The proper way to achieve this is to run the sane
  > daemon as root (see man saned on how to set it up).

  Yes, this is right. To see debug info you can start scanimage this way

  # SANE_DEBUG_SANEI_PA4S2=6 scanimage -L 2>&1 | less

  >
  > >
  > > Running scanimage as root will cause an error in loading libraries
  > > (undefined symbol: outb), which indicates that the program progresses
  > > beyond the point described in my problem.
  >
  > No idea what is causing this. David Gesswein could be right about
  > the optimization issue. Do you have an x86 platform ? I believe
  > the low-level assembly routines accessing the io-ports are only
  > implemented for x86 hardware.
  >
  The outb is a macro which is only expanded, if the sanei_pa4s2 file is compiled
  with -O2. Make sure, the CFLAGS in the Makefile include -O2

  regards
  -- jochen

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