[WIA] Unable to set 'duplex' for document_handling_select
Scanner: HP LaserJet MFP M426fdn.
I'm trying to set the "duplex" value for the "document_handling_select" option, but it fails:
[LibInsane:WARNING] ../subprojects/libinsane/src/workarounds/check_capabilities.c:L38(set_value): set_value(document_handling_select) -> only one value possible != different from value request -> denied
[LibInsane:ERROR] ../subprojects/libinsane/src/workarounds/cache.c:L229(cache_set_value): document_handling_select->set_value() failed: 0x40000003, Invalid value
[LibInsane:ERROR] ../subprojects/libinsane/src/util.c:L244(lis_set_option): feeder: Failed to set document_handling_select=duplex
It works with setting the option as integer value (with editing the option description in libinsane).
Are there ways to set "duplex" value for this option?