Comment 6 for bug 1979036

The test failed with error list below:

ID: com.canonical.certification::touchpad/palm-rejection-firmware-labeling_ELAN0678_00_04F3_3195_Touchpad
Category: com.canonical.plainbox::touchpad
... 8< -------------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/nest-9roc0600.478c4952642bd256030a1147ed323c16a2d1f00251873c42ea6472976890f74e/touchpad_confidence_bit.py", line 54, in <module>
    main()
  File "/tmp/nest-9roc0600.478c4952642bd256030a1147ed323c16a2d1f00251873c42ea6472976890f74e/touchpad_confidence_bit.py", line 33, in main
    path = TouchpadDevices().devices[product_slug]
  File "/tmp/nest-9roc0600.478c4952642bd256030a1147ed323c16a2d1f00251873c42ea6472976890f74e/touchpad_confidence_bit.py", line 12, in __init__
    self._collect_devices()
  File "/tmp/nest-9roc0600.478c4952642bd256030a1147ed323c16a2d1f00251873c42ea6472976890f74e/touchpad_confidence_bit.py", line 17, in _collect_devices
    output = check_output(cmd).decode(sys.stdout.encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc0 in position 38854: invalid start byte
------------------------------------------------------------------------- >8 ---