I have a HP Envy 6000 series (6032e) printer scanner with the hplib and hplib-drivers installed. It is connected by USB and printing works fine. However simple scan detects the scanner correctly at startup but it fails on this I/O error in the log when trying to scan.
[+15.76s] DEBUG: scanner.vala:905: sane_open ("hpaio:/usb/ENVY_6000_series?serial=TH182CD1ND") -> SANE_STATUS_IO_ERROR
Also hp-uiscan reports no device connected.
Simple Scan Log :-
[+0.00s] DEBUG: simple-scan.vala:2012: Starting simple-scan 40.5, PID=2661
[+0.00s] DEBUG: unsetenv() is not thread-safe and should not be used after threads are created
[+0.02s] DEBUG: _g_io_module_get_default: Found default implementation dconf (DConfSettingsBackend) for ‘gsettings-backend’
[+0.07s] DEBUG: app-window.vala:1999: Loading state from /home/admin/.cache/simple-scan/state
[+0.07s] DEBUG: app-window.vala:1978: Restoring window to 1362x740 pixels
[+0.15s] DEBUG: scanner.vala:1596: sane_init () -> SANE_STATUS_GOOD
[+0.15s] DEBUG: scanner.vala:1602: SANE version 1.0.30
[+0.15s] DEBUG: scanner.vala:1663: Requesting redetection of scan devices
[+0.15s] DEBUG: scanner.vala:844: Processing request
[+0.27s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+6.64s] DEBUG: scanner.vala:348: sane_get_devices () -> SANE_STATUS_GOOD
[+6.64s] DEBUG: scanner.vala:360: Device: name="v4l:/dev/video0" vendor="Noname" model="Integrated Camera: Integrated C" type="virtual device"
[+6.64s] DEBUG: scanner.vala:360: Device: name="hpaio:/usb/ENVY_6000_series?serial=TH182CD1ND" vendor="Hewlett-Packard" model="ENVY_6000_series" type="all-in-one"
[+6.64s] DEBUG: scanner.vala:360: Device: name="hpaio:/net/envy_6000_series?ip=192.168.0.10&queue=false" vendor="Hewlett-Packard" model="envy_6000_series" type="all-in-one"
[+6.75s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+13.37s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+15.23s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+15.74s] DEBUG: simple-scan.vala:1817: Requesting scan at 600 dpi from device 'hpaio:/usb/ENVY_6000_series?serial=TH182CD1ND'
[+15.74s] DEBUG: scanner.vala:1754: Scanner.scan ("hpaio:/usb/ENVY_6000_series?serial=TH182CD1ND", dpi=600, scan_mode=ScanMode.COLOR, depth=8, type=single, side=back, paper_width=0, paper_height=0, brightness=0, contrast=0, delay=0ms)
[+15.74s] DEBUG: scanner.vala:844: Processing request
[+15.76s] DEBUG: scanner.vala:905: sane_open ("hpaio:/usb/ENVY_6000_series?serial=TH182CD1ND") -> SANE_STATUS_IO_ERROR
[+15.76s] WARNING: scanner.vala:909: Unable to open device: Error during device I/O
[+15.93s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+494.05s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+494.27s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+494.88s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+495.04s] DEBUG: app-window.vala:2074: Saving state to /home/admin/.cache/simple-scan/state
[+495.19s] DEBUG: autosave-manager.vala:201: Deleting autosave records
[+495.19s] DEBUG: scanner.vala:1784: Stopping scan thread
[+495.19s] DEBUG: scanner.vala:844: Processing request
[+495.19s] DEBUG: scanner.vala:1795: sane_exit ()