Brightness Control not working after update.

After updating to the latest TW (20171010) with kernel 4.13.5-1-default the brightness control both with the fn keys and the display brightness in the battery settings, is not working and of course I’m running out of battery in half the usual time. It was working before without issues.

Laptop: HP Zbook Studio. Display: nVidia quadro M1000M. Driver: nouveau

hwinfo --gfcard

29: PCI 100.0: 0300 VGA compatible controller (VGA)             
  [Created at pci.378]
  Unique ID: VCu0.moTIoUcFh_C
  Parent ID: vSkL.z8g7wsXJttA
  SysFS ID: /devices/pci0000:00/0000:00:01.0/0000:01:00.0
  SysFS BusID: 0000:01:00.0
  Hardware Class: graphics card
  Model: "nVidia GM107GLM [Quadro M1000M]"
  Vendor: pci 0x10de "nVidia Corporation"
  Device: pci 0x13b1 "GM107GLM [Quadro M1000M]"
  SubVendor: pci 0x103c "Hewlett-Packard Company"
  SubDevice: pci 0x8108 
  Revision: 0xa2
  Driver: "nouveau"
  Driver Modules: "drm"
  Memory Range: 0xe3000000-0xe3ffffff (rw,non-prefetchable)
  Memory Range: 0xa0000000-0xafffffff (ro,non-prefetchable)
  Memory Range: 0xb0000000-0xb1ffffff (ro,non-prefetchable)
  I/O Ports: 0x3000-0x3fff (rw)
  Memory Range: 0x000c0000-0x000dffff (rw,non-prefetchable,disabled)
  IRQ: 128 (247654 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v000010DEd000013B1sv0000103Csd00008108bc03sc00i00"
  Driver Info #0:
    Driver Status: nouveau is active
    Driver Activation Cmd: "modprobe nouveau"
  Config Status: cfg=no, avail=yes, need=no, active=unknown
  Attached to: #25 (PCI bridge)

Primary display adapter: #29

ls -l /sys/class/backlight/

lrwxrwxrwx 1 root root 0 Oct 16 22:58 acpi_video0 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0

dmesg|grep ‘ACPI: Video’

[6.765134]] ACPI: Video Device [PEGP] (multi-head: yes  rom: yes  post: no)

What can I do?

An upstream kernel bug report may well be needed.

Any errors?

dmesg|grep -i acpi

FWIW, similar reported here……

Here is my output:

I check the reports later today. Many Thanks.