I've recently started using linux mint debian amd 64 and the canon LIDE 210 scanner seems to be supported in xsane currently available (rev 0.998) and indeed it does respond properly to the 'scan' and/or 'preview' buttons. However, after a scan, it leaves the scanner head at the bottom, and if you attempt a second scan the head is driven against the stop. Quitting xsane and restarting it will restore the head to the top (a sort of work-around). The 'simple scan' program does not have this problem--it works perfectly (except that it doesn't have the features that xsane does). I've browsed various fora, and the xsane documentation and project website (where it states the LIDE 210 is fully supported). I've tried re-installing xsane--no difference. Any suggestions would be appreciated.
While attempting to produce a work-around by using a suitably-optioned command line to scanimage, I discovered that adding the (backend) option --swcrop=yes causes scanimage to also fail to return the scanner head. Removing the 'Software crop' selection in xsane's advanced options page also restores xsane to normal operation.
So I still don't really know why the crop feature should cause this fault, it is NOT an xsane problem.