Comment 22 for bug 1819742

i have same problem:
[alois@notebook ~]$ hp-scan -g

HP Linux Imaging and Printing System (ver. 3.19.3)
Scan Utility ver. 2.2

Copyright (c) 2001-18 HP Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

hp-scan[5551]: debug: getDeviceUri(None, None, ['hpaio'], {'scan-type': (<built-in function gt>, 0)}, , True)
hp-scan[5551]: debug: Mode=0

-----------------
| SELECT DEVICE |
-----------------

  Num Scan device URI
  -------- ----------------------------------------------------
  0 v4l:/dev/video0
  1* hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC3S06486

Enter number 0...1 for device (q=quit, <enter>=default: 1*) ?
warning: No destinations specified. Adding 'file' destination by default.
Using device hpaio:/usb/HP_LaserJet_MFP_M28-M31?serial=VNC3S06486
Opening connection to device...
hp-scan[5551]: debug: Supported source Options: ['Flatbed'] size=1
hp-scan[5551]: debug: Device supported resolutions [200, 300, 600]

Resolution: 300dpi
Mode: gray
Compression: JPEG
Scan area (mm):
  Top left (x,y): (0.000000mm, 0.000000mm)
  Bottom right (x,y): (215.900009mm, 297.010681mm)
  Width: 215.900009mm
  Height: 297.010681mm
Destination(s): file
Output file:
hp-scan[5551]: debug: Supported modes: ['gray', 'color'] size=2
warning: File destination enabled with no output file specified.
Setting output format to PNG for greyscale mode.
warning: Defaulting to '/home/alois/hpscan001.png'.

Warming up...

Scanning...
error: SANE: Error during device I/O (code=9)
Closing device.
[alois@notebook ~]$

under virtualbox in windows 7 works all perfect, scanner scanning without problem. So is problem with hplip/hplip-plugin.