Comment 28 for bug 1775065

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!