Got a similar problem on a HP Zbook G5. I have 2 graphics cards: Intel + Nvidia.
I use the Nvidia proprietary drivers 415. The difference in my case is that I
have an entry in "/sys/class/backlight", namely: "intel_backlight" and that I
can control the display brightness using the gnome GUI slider, but also my
backlight hotkeys are not working and none of the following kernel parameters
solved the issue:
"acpi_backlight=vendor"
"acpi_backlight=video"
"acpi_backlight=video0"
"acpi_backlight=none"
"acpi_osi=Linux"
Since many people are experiencing this annoying bug, it would really be great
if it could be solved.
Anyhow, thanks for any of your efforts to solve this issue!
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https://bugs.launchpad.net/bugs/1775065
Title:
No brightness controls and /sys/class/backlight empty after upgrade to
Bionic on laptop with GeForce GTX 1060 Mobile (kernel parameter
acpi_osi= is a workaround)
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