[sane-devel] Canon Lide 120 produces all black scans

[Paradox]

I am trying to get a Canon Lide 120 scanner working. I am using Arch, 
kernel is 4.1.6-1-ARCH.  Using the latest sane package from AUR 
(sane-git) the scanner is recognized by scanimage.  According to the 
genesys man page the scanner is supported by sane-genesys. Everything 
seems to be OK but when I run a scan I get a pure black image.  The 
light comes on in the scanner, the scan bar moves, etc. but the image is 
just blackness.

Is there a fix for this?

Thanks in advance for any assitance.

thomas