[sane-devel] scanimage --batch-count=n not working

[gobo]

in the process of moving to a newer hp mfp printer and attempting to use
the following command:

scanimage -x 215.9 -y 279.4 -d
hpaio:/net/HP_Color_LaserJet_MFP_M477fdn?ip=192.168.1.101 \
          -pv --mode gray --resolution 150 \
          --batch=$FILE --batch-count=1 --source=ADF

the idea is to scan a single sheet through the adf.  as long as a single
sheet is in the adf, a single file is generated.  however, if multiple
sheets are loaded in the adf tray, the adf feeds all of them through
anyway.  so it looks like the --batch-count=1 option is being ignored.

i don't know if i am using the command incorrectly, if this is a sane issue
or an hplip issue.  can anyone advise.

thanks in advance.

ubuntu 14.04
sane 1.0.14-9
hplip 3.17.11
m477fdn multi-function printer.
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