Changing screen brightness fails

[Lisa Nelson]

Lenovo Legion with Nvidia card:

FN+F5/F6 shows brightness changes, but the screen actually doesn't change at all.

01:00.0 VGA compatible controller: NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] (rev a1)

nvidia 20430848 538 nvidia_uvm,nvidia_modeset
nvidia_drm 45056 8
nvidia_modeset 1114112 12 nvidia_drm
nvidia_uvm 966656 0
nvme 49152 2
nvme_core 102400 4 nvme

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
Uname: Linux 5.4.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 440.64 Fri Feb 21 01:17:26 UTC 2020
 GCC version: gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 24 06:23:22 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus: nvidia, 440.64, 5.4.0-26-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation TU117M [GeForce GTX 1650 Mobile / Max-Q] [10de:1f91] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Lenovo TU117M [GeForce GTX 1650 Mobile / Max-Q] [17aa:3ffb]
InstallationDate: Installed on 2020-03-12 (42 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200306)
MachineType: LENOVO 81T2
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-26-generic root=UUID=51068ea2-6b38-4cfc-a75f-4f404cd04685 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/23/2019
dmi.bios.vendor: LENOVO
dmi.bios.version: BHCN35WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0R32862 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Legion Y545 PG0
dmi.modalias: dmi:bvnLENOVO:bvrBHCN35WW:bd11/23/2019:svnLENOVO:pn81T2:pvrLegionY545PG0:rvnLENOVO:rnLNVNB161216:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrLegionY545PG0:
dmi.product.family: Legion Y545 PG0
dmi.product.name: 81T2
dmi.product.sku: LENOVO_MT_81T2_BU_idea_FM_Legion Y545 PG0
dmi.product.version: Legion Y545 PG0
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Lisa Nelson (lisa50469)]

Also: the slider in settings does not change the brightness either.

[Sebastien Bacher (seb128)]

Thank you for your bug report. Could you add your 'journalctl -b 0' log after getting the issue? Could also try if disabling the nvidia driver and using nouveau makes a difference?

[Lisa Nelson (lisa50469)]

Attaching Journalctl log

[Lisa Nelson (lisa50469)]

Monitoring syslog I see the following when I try to change screen brightness:

root@lisa-Legion-Y545-PG0:~# tail -f /var/log/syslog
Apr 27 10:46:55 lisa-Legion-Y545-PG0 kernel: [ 142.184842] nvme 0000:06:00.0: AER: device [15b7:5006] error status/mask=00000001/0000e000
Apr 27 10:46:55 lisa-Legion-Y545-PG0 kernel: [ 142.184846] nvme 0000:06:00.0: AER: [ 0] RxErr
Apr 27 10:47:00 lisa-Legion-Y545-PG0 kernel: [ 147.048707] pcieport 0000:00:1d.0: AER: Corrected error received: 0000:06:00.0
Apr 27 10:47:00 lisa-Legion-Y545-PG0 kernel: [ 147.048718] nvme 0000:06:00.0: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
Apr 27 10:47:00 lisa-Legion-Y545-PG0 kernel: [ 147.048725] nvme 0000:06:00.0: AER: device [15b7:5006] error status/mask=00000001/0000e000
Apr 27 10:47:00 lisa-Legion-Y545-PG0 kernel: [ 147.048731] nvme 0000:06:00.0: AER: [ 0] RxErr
Apr 27 10:47:20 lisa-Legion-Y545-PG0 kernel: [ 167.054672] pcieport 0000:00:1d.0: AER: Corrected error received: 0000:06:00.0
Apr 27 10:47:20 lisa-Legion-Y545-PG0 kernel: [ 167.054687] nvme 0000:06:00.0: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID)
Apr 27 10:47:20 lisa-Legion-Y545-PG0 kernel: [ 167.054696] nvme 0000:06:00.0: AER: device [15b7:5006] error status/mask=00000001/0000e000
Apr 27 10:47:20 lisa-Legion-Y545-PG0 kernel: [ 167.054701] nvme 0000:06:00.0: AER: [ 0] RxErr
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 31 with keysym 31 (keycode a).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 32 with keysym 32 (keycode b).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 38 with keysym 38 (keycode 11).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 39 with keysym 39 (keycode 12).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 33 with keysym 33 (keycode c).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 34 with keysym 34 (keycode d).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 35 with keysym 35 (keycode e).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 36 with keysym 36 (keycode f).
Apr 27 10:47:28 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 37 with keysym 37 (keycode 10).

Apr 27 10:48:01 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 31 with keysym 31 (keycode a).
Apr 27 10:48:01 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Overwriting existing binding of keysym 32 with keysym 32 (keycode b).
Apr 27 10:48:01 lisa-Legion-Y545-PG0 gnome-shell[2043]: Window manager warning: Ov...

[Daniel van Vugt (vanvugt)]

I think this is close enough to bug 1861532 that we should use that.