> That is a very old version of sane-backends. I do not know if it will > help, but an upgrade would be a good start.
I have same error with sane-backends 1.0.21 imac:~/pkg/sane-frontends-1.0.14# /usr/local/bin/scanimage -L [sanei_debug] Setting debug level of hp5590 to 50. [hp5590] SANE backed for HP ScanJet 4500C/4570C/5500C/5550C/5590/7650 1.0.5 [hp5590] (c) Ilia Sotnikov <hostcc at gmail.com> [hp5590] attach_usb_device: Opening USB device [hp5590] attach_usb_device: USB device opened [hp5590] hp5590_init_scanner [hp5590] hp5590_cmd: USB-in-USB: command : 0012 [hp5590] hp5590_control_msg: USB-in-USB: core data: no [hp5590] hp5590_control_msg: USB-in-USB: sending control msg [hp5590] hp5590_control_msg: USB-in-USB: checking acknowledge for control message [hp5590] hp5590_get_ack [hp5590] hp5590_get_ack: USB-in-USB: accepted [hp5590] hp5590_control_msg: USB-in-USB: checking if confirmation was acknowledged [hp5590] hp5590_get_ack [hp5590] hp5590_get_ack: USB-in-USB: accepted [hp5590] hp5590_verify_last_cmd: USB-in-USB: command verification requested [hp5590] hp5590_control_msg: USB-in-USB: core data: no [hp5590] hp5590_control_msg: USB-in-USB: sending control msg [hp5590] hp5590_control_msg: USB-in-USB: checking acknowledge for control message [hp5590] hp5590_get_ack [hp5590] hp5590_get_ack: USB-in-USB: error getting acknowledge [hp5590] sane_hp5590_get_devices, local only: 0 [hp5590] Found 0 devices No scanners were identified. If you were expecting something different, check that the scanner is plugged in, turned on and detected by the sane-find-scanner tool (if appropriate). Please read the documentation which came with this software (README, FAQ, manpages). [hp5590] sane_hp5590_exit imac:~/pkg/sane-frontends-1.0.14# /usr/local/bin/scanimage --version scanimage (sane-backends) 1.0.21; backend version 1.0.21
