debug info with new teco backend. export SANE_DEBUG_TECO=20 scanimage -d teco:/dev/scanner [sanei_debug] Setting debug level of teco to 20. [teco] sane_init [teco] This is sane-teco version 1.0-1 [teco] (C) 2002 by Frank Zago [teco] attach_scanner: /dev/scanner [teco] teco_init: enter [teco] teco_init: exit [teco] attach_scanner: opening /dev/scanner [teco] teco_identify_scanner: enter [teco] inquiry [teco] 000: 06 00 02 02 43 00 00 00 20 20 20 20 20 20 20 20 ....C... [teco] 016: 46 6c 61 74 62 65 64 20 53 63 61 6e 6e 65 72 20 Flatbed Scanner [teco] 032: 31 2e 30 33 31 2e 30 33 00 01 54 45 43 4f 20 56 1.031.03..TECO V [teco] 048: 4d 33 35 37 35 20 00 01 01 2c 00 01 02 58 09 f6 M3575 ...,...X.. [teco] 064: 0d af 01 2c 00 08 01 00 ...,.... [teco] device is " " "Flatbed Scanner " "1.03" [teco] teco_identify_scanner: exit, device not supported [teco] ERROR: attach_scanner: scanner-identification failed [teco] teco_free: enter [teco] teco_close: enter [teco] teco_close: exit [teco] teco_free: exit [teco] sane_init: leave [teco] sane_open: enter [teco] sane_open: devicename=/dev/scanner [teco] attach_scanner: /dev/scanner [teco] teco_init: enter [teco] teco_init: exit [teco] attach_scanner: opening /dev/scanner [teco] teco_identify_scanner: enter [teco] inquiry [teco] 000: 06 00 02 02 43 00 00 00 20 20 20 20 20 20 20 20 ....C... [teco] 016: 46 6c 61 74 62 65 64 20 53 63 61 6e 6e 65 72 20 Flatbed Scanner [teco] 032: 31 2e 30 33 31 2e 30 33 00 01 54 45 43 4f 20 56 1.031.03..TECO V [teco] 048: 4d 33 35 37 35 20 00 01 01 2c 00 01 02 58 09 f6 M3575 ...,...X.. [teco] 064: 0d af 01 2c 00 08 01 00 ...,.... [teco] device is " " "Flatbed Scanner " "1.03" [teco] teco_identify_scanner: exit, device not supported [teco] ERROR: attach_scanner: scanner-identification failed [teco] teco_free: enter [teco] teco_close: enter [teco] teco_close: exit [teco] teco_free: exit scanimage: open of device teco:/dev/scanner failed: Invalid argument [teco] sane_exit: enter [teco] sane_exit: exit