Hi all! We recently aquired a Canon DR-2020U scanner and I tried to test it with a recent sane git-snapshot. It compiled without problems and I tried to use it with the canon_dr backend. This failed. Allan Noah told me that this model uses a very different control method than the other "DR" scanners and thus the canon_dr backend cannot work.
I made a scan with Windows XP and logged the USB Commands with USBSnoop. This logfile is available for download here (ca. 4.3 MB): http://dl.dropbox.com/u/3879521/CANON-DR2020U_UsbSnoop.log.bz2 Maybe this is helpful for somebody interested in creating a suitable backend for this scanner. I would be glad to be able to use this scanner with Linux. Regards, fabz