Print quality problems -- Epson WF-3620/Linux Mint 13
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Err... Correction: the line 'usb 0x04b8 0x0110' says that the device with vendor ID 0x04b8 (that would be Seiko/Epson) and device ID 0x0110 should be opened using this epkowa library - this is the driver that you downloaded from the Epson website. The device ID is actually 0x08b8, not 0x0110. You can see it in the list displayed by the 'lsusb' utility.
So: the file /etc/sane.d/epkowa.conf should contain this line:
usb 0x04b8 0x08b8
Note that in my case it works without it, but I don't know what is happening on your computer.
I know - those are the configuration files for the drivers for older models and are part of the standard Linux Mint distribution (as far as I know).
The driver you need is a file called /usr/lib/sane/libsane-epkowa.so.1.0.15, which comes from the iscan_2.30.1-1~usb0.1.ltdl7_amd64.deb package from the Epson website. The configuration file for that driver is /etc/sane.d/epkowa.conf and comes from the same package. I wonder how did it ever work for you without it...
It worked! At least for today. The scanner still doesn't come up in the device selection menu for either Simple Scan or gscan2pdf, but if I unplug the older scanner then the new one becomes the default. I just tried scanning something on the flatbed using Simple Scan and was successful. Will try the ADF sometime soon, and if that works too, I'll mark this thread as solved. Thanks so much for your help and patience.