LG 'CT21L' BD-DVD-RW not working

Support & Help Requests
1

Plays fine under Windows 7 Ultimate
Using VLC

Ubuntu MATE 15.04 and 16.04
HP DV-7 laptop

2

Yours being the HP Pavilion dv7 Notebook PC/147B (?) as this is the only DV-7 mentioned, there.

3

dv7-4171us
already flashed the BIOS (v14 ==> 29)