Yes, this was after an upgrade to Ubuntu 18.04 LTS (Bionic Beaver) from
Ubuntu 17.10.1 (Artful Aardvark).
The bug is fixed in the mainline kernel; I have added the appropriate
tag and marked the bug as confirmed.
** Tags added: kernel-fixed-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: apport-collected
** Description changed:
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.
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
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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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1775065/+subscriptions
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