Adrian:
1) Is this something that stopped working after an update? If so, which and when precisely?
2) Could you please provide the missing information from https://wiki.ubuntu.com/Kernel/Debugging/Backlight ?
Adrian:
1) Is this something that stopped working after an update? If so, which and when precisely?
2) Could you please provide the missing information from https:/ /wiki.ubuntu. com/Kernel/ Debugging/ Backlight ?