Bingo. You're right about hp-scan failing in hplip version >3.11.10. Likely an upstream bug. I've attached "hp-scan-hplip-3.11.10.log" showing a successful scan and "hp-scan-hplip-3.12.6.log" showing failing at:
Opening connection to device...
warning: Invalid resolution. Using closest valid resolution of 300 dpi
warning: Valid resolutions are dpi.
Traceback (most recent call last):
File "/usr/bin/hp-scan", line 636, in <module>
res = valid_res[0]
IndexError: list index out of range
1 :-(
Bingo. You're right about hp-scan failing in hplip version >3.11.10. Likely an upstream bug. I've attached "hp-scan- hplip-3. 11.10.log" showing a successful scan and "hp-scan- hplip-3. 12.6.log" showing failing at:
Opening connection to device...
warning: Invalid resolution. Using closest valid resolution of 300 dpi
warning: Valid resolutions are dpi.
Traceback (most recent call last):
File "/usr/bin/hp-scan", line 636, in <module>
res = valid_res[0]
IndexError: list index out of range
1 :-(