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)
Status in linux package in Ubuntu:
Confirmed
Bug description:
This is a case of "Backlight control does not work, and there are no
entries in /sys/class/backlight" for what lspci reports as "NVIDIA
Corporation GP106M [GeForce GTX 1060 Mobile] (rev a1)" where the
kernel parameter acpi_osi= is a workaround. (The workaround is also
recorded on Ask Ubuntu at https://askubuntu.com/questions/1030526
/brightness-on-laptop-msi-gt72vr-in-ubuntu-18-04-with-nvidia-gtx-1060
-mobile-does/1043598#1043598.)
The problem is new for me after upgrade to Bionic, although the cause
might be the corresponding update to the NVIDIA drivers.
I will add attachments following the instructions at
https://wiki.ubuntu.com/Kernel/Debugging/Backlight, though most of
them seem to be uninteresting. If I can provide further information,
please let me know.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-22-generic 4.15.0-22.24
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 4 14:20:34 2018
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed
UpgradeStatus: Upgraded to bionic on 2018-06-04 (0 days ago)
---
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: bgarvin 2442 F.... pulseaudio
/dev/snd/controlC0: bgarvin 2442 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=UUID=1b60cccb-eea7-4d0b-a32b-97d236a5177f
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 04f2:b5a7 Chicony Electronics Co., Ltd
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 002: ID 1c7a:0603 LighTuning Technology Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: System76, Inc. Oryx Pro
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-22-generic
root=UUID=557ebdfc-3380-4721-a494-65c34cb70b2f ro i8042.nomux i8042.reset
acpi_osi=
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
RelatedPackageVersions:
linux-restricted-modules-4.15.0-22-generic N/A
linux-backports-modules-4.15.0-22-generic N/A
linux-firmware 1.173.1
Tags: bionic
Uname: Linux 4.15.0-22-generic x86_64
UpgradeStatus: Upgraded to bionic on 2018-06-04 (1 days ago)
UserGroups: adm lpadmin sambashare sudo vboxusers
_MarkForUpload: True
dmi.bios.date: 09/08/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.03RSA
dmi.board.asset.tag: Tag 12345
dmi.board.name: Oryx Pro
dmi.board.vendor: System76, Inc.
dmi.board.version: oryp2
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: N/A
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr1.05.03RSA:bd09/08/2016:svnSystem76,Inc.:pnOryxPro:pvroryp2:rvnSystem76,Inc.:rnOryxPro:rvroryp2:cvnSystem76,Inc.:ct10:cvrN/A:
dmi.product.family: Not Applicable
dmi.product.name: Oryx Pro
dmi.product.version: oryp2
dmi.sys.vendor: System76, Inc.
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