Bug ID: 198907
           Summary: Backlight control missing with /sys/class/backlight/
           Product: ACPI
           Version: 2.5
    Kernel Version: 4.14.0-3-amd64 #1 SMP Debian 4.14.13-1 (2018-01-14)
                    x86_64 GNU/Linux
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
        Regression: No

Laptop HP Omen 15-ce012ur 
4.14.0-3-amd64 #1 SMP Debian 4.14.13-1 (2018-01-14) x86_64 GNU/Linux.

My video card shows in lspci as:

01:00.0 VGA compatible controller: NVIDIA Corporation GP106M [GeForce GTX 1060]
(rev a1).

Freshly installed Debian. While loading, shows numerous copies of "ACPI Error:
namespace lookup failure. AE_NOT_FOUND".
/sys/class/backlight/ was empty from the start, all ways of changing brightness
do not exist. 
That also holds for live-USB with Debian and Ubuntu as well.

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