[sane-devel] HP ScanJet 7400c open of device faled: invalid arguement

[Roger]

I do not have this exact HP product, but from my experience, HP products tend 
to require the HPLIP package.  More specifically, the device may require the 
propreitary binary scanner driver.  Usually, HP printers prefer to use CUPS 
postscript drives.  (I tend to prefer the PCL driver, as PCL is much quicker 
for printing rough draft quality printing.)  If your scanner requires HPLIP, 
also enable "hpaio" within the /etc/sane.d/dll.conf file.

Due to fiascals with HPLIP, I purchased a CANON 9000f MK2 scanner which uses 
entirely open source and completed drivers for the scanner interface, and also 
includes support within VueScan.  My HP multifunction device is now only used 
as a printer and copier.

--
Roger
http://rogerx.freeshell.org/