I changed [hp_laserjet_mfp_m28-m31] to [laserjet_mfp_m28-m31]
The message
Dec 17 02:50:55 sabo-probook perl: io/hpmud/model.c 532: no laserjet_mfp_m28-m31 attributes found in /usr/share/hplip/data/models/models.dat
Dec 17 02:50:55 sabo-probook perl: io/hpmud/model.c 543: no laserjet_mfp_m28-m31 attributes found in /usr/share/hplip/data/models/unreleased/unreleased.dat
I changed [hp_laserjet_ mfp_m28- m31] to [laserjet_ mfp_m28- m31]
The message
Dec 17 02:50:55 sabo-probook perl: io/hpmud/model.c 532: no laserjet_ mfp_m28- m31 attributes found in /usr/share/ hplip/data/ models/ models. dat mfp_m28- m31 attributes found in /usr/share/ hplip/data/ models/ unreleased/ unreleased. dat
Dec 17 02:50:55 sabo-probook perl: io/hpmud/model.c 543: no laserjet_
Disappear. But scanning is still very slow.