Display settings lost when leaving screen saver / screen switch

[edA-qa]

The settings of the screen, in particular brightness and gamma, are being lost in numerous situations:
- leaving a screen saver/lock
- switching users
- random time
- logging in

This applies to settings set via xrandr, or using the nvidia-settings tool.

This did not happen in previous versions of Ubuntu (20.04 for example). I am using Kubuntu as a desktop.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: xorg 1:7.7+23ubuntu2
ProcVersionSignature: Ubuntu 5.15.0-50.56-generic 5.15.60
Uname: Linux 5.15.0-50-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia wl
.proc.driver.nvidia.capabilities.gpu0: Error: path was not a regular file.
.proc.driver.nvidia.capabilities.mig: Error: path was not a regular file.
.proc.driver.nvidia.gpus.0000.65.00.0: Error: path was not a regular file.
.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 515.76 Mon Sep 12 19:21:56 UTC 2022
 GCC version:
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: unknown
CompositorRunning: None
CurrentDesktop: KDE
Date: Sat Oct 15 11:43:15 2022
DistUpgraded: 2022-09-22 20:03:38,859 ERROR found exception: 'E:Sub-process /usr/bin/dpkg returned an error code (1)'
DistroCodename: jammy
DistroVariant: ubuntu
DkmsStatus:
 bcmwl/6.30.223.271+bdcom, 5.15.0-48-generic, x86_64: installed
 bcmwl/6.30.223.271+bdcom, 5.15.0-50-generic, x86_64: installed
 virtualbox/6.1.38, 5.15.0-48-generic, x86_64: installed
 virtualbox/6.1.38, 5.15.0-50-generic, x86_64: installed
ExtraDebuggingInterest: No
GraphicsCard:
 NVIDIA Corporation GP106 [GeForce GTX 1060 6GB] [10de:1c03] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. GP106 [GeForce GTX 1060 6GB] [1043:85a4]
MachineType: Micro-Star International Co., Ltd. MS-7A94
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-50-generic root=UUID=937cdc48-c0d2-45e6-a578-a819d2b1378f ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to jammy on 2022-09-22 (22 days ago)
dmi.bios.date: 07/12/2019
dmi.bios.release: 5.13
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.B0
dmi.board.asset.tag: Default string
dmi.board.name: X299 RAIDER (MS-7A94)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.B0:bd07/12/2019:br5.13:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A94:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnX299RAIDER(MS-7A94):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuDefaultstring:
dmi.product.family: Default string
dmi.product.name: MS-7A94
dmi.product.sku: Default string
dmi.product.version: 1.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.110-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 22.0.5-0ubuntu0.1
version.libgl1-mesa-glx: libgl1-mesa-glx 22.0.5-0ubuntu0.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.3-2ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1

[Daniel van Vugt (vanvugt)]

Supporting manual xrandr settings is generally not a priority for shell developers. The shell expects to own and control everything, and that the user has chosen their settings in the GUI provided by the shell / desktop environment.

But we can make it an enhancement request to see if it's possible for them all to co-exist.

[edA-qa (eda-qa)]

I think the limitation would be okay if the system provided a way to adjust the display properties. But there is no brightness/contrast setting, at least not in the Kubuntu system settings. If there is actually a hidden config variable somewhere, I'd be happy to set that.

That is, I use xrandr because I don't have ability to control the screen brightness in the GUI provided settings.

Note, this also applies to the settings set by nvidia-settings. So there was an expectation in the past the settings would not be changed elsewhere. I think tools like redshift, and other brightness control apps, are also expecting their settings to be retained.

[Scarlett Gately Moore (scarlettmoore)]

Brightness can be set under systemsettings -> power management. Unfortunately, contrast cannot. There have been workarounds with colorschemes eg: https://www.reddit.com/r/kde/comments/nqkka3/guide_increasing_contrast_on_blurred_screens/

This is not something we ( kubuntu ) can fix. I would suggest doing a feature request upstream bugs.kde.org under systemsettings. Thanks