Hello, after downloading libusb-0.1.10a and 1.0.17 I repeated my tests with USB-Scanner Medion MD5345 and got the following results:
Test environment: Linux box based on SuSE 8.1, dual P3 933MHz, 768MB, m/b MSI 694D-Pro (MS-6321). Resolution 100 200 300 600 Color ok ok ok 3) ok 3) Gray ok 1,2) ok ok ok 3) Lineart ok 1,2) ok 4) ok 4) ok 3,5) Test conditions: each scan was done at least two times. Tests have been done using scanimage. Footnotes 1) Reset of scanner (power off) does not help, hotplug service has to be restarted with unloading of module usbcore. 2) Only first scan is successful, any other fails. 3) Head is moving back and forth. 4) Second scan out of 5 was scrambeled. 5) Third scan out of 5 was scrambeled. Compared with sane-backends there is a great improvement! Congratulation. But why do the "simple" test modes Gray and Lineart fail? Regards Martin Jacobs