[nvidia] Display Scaling causes monitors to sleep

[Chris Ferguson]

Default install of Focal Fossa 20.04 Beta downloaded April 4, 2020.

Steps to Reproduce:
1. Open Settings
2. Navigate to Displays.
3. In Scale section, select `200%`
4. Click Apply
Expected behavior: Screens refresh with a 200% scale applied and a dialog to confirm.
Error encountered: Screens switch to "power saving mode" (go blank). After about 15 seconds, they wake up in the original 100% scale mode.

Other notes:
I have done this successfully with 18.04 on the exact same hardware (different hard drive partitions) in the past after installing NVidia drivers.
I have successfully rearranged the monitors in Settings and changed the Primary Display in Settings with this install.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia wl
.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 9.3.0-8ubuntu1)
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Apr 5 10:09:14 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.271+bdcom, 5.4.0-21-generic, x86_64: installed
 nvidia, 440.64, 5.4.0-21-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 NVIDIA Corporation TU106 [GeForce RTX 2070 Rev. A] [10de:1f07] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: eVga.com. Corp. TU106 [GeForce RTX 2070 Rev. A] [3842:2173]
InstallationDate: Installed on 2020-04-05 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
MachineType: Micro-Star International Co., Ltd. MS-7B17
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=a4cb80c1-f367-4150-afd3-31e3ee90bd50 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/25/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.50
dmi.board.asset.tag: Default string
dmi.board.name: MPG Z390 GAMING PRO CARBON (MS-7B17)
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.:bvr1.50:bd03/25/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B17:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnMPGZ390GAMINGPROCARBON(MS-7B17):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:
dmi.product.family: Default string
dmi.product.name: MS-7B17
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 2.4.100-4
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.2-1ubuntu1
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 2:1.20.7-2ubuntu2
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+git20190815-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Chris Ferguson (chrisferguson.softwareengneer)]

Additional notes (forgot to add to original report).

nVidia RTX 2070
Dual monitor setup.
Monitors connected through StarTech KVM over DisplayPort cables.

I did not have the KVM when I used 18.04

Successfully adjusted monitor resolutions (from 3840x2160 to 2560x1440).

[Sebastien Bacher (seb128)]

Thank you for your bug report. It looks similar to bug #1870758. Could you add a journalctl log from a session where you triggered the issue?

[Chris Ferguson (chrisferguson.softwareengneer)]

Looking over the log, I noticed this message occurs 4 times since the install:
`gnome-shell[<pid>]: Getting invalid resource scale property`

[Chris Ferguson (chrisferguson.softwareengneer)]

I did another test, capturing the exact event window. Attachment journalctl_limited_log.exe, 20:54:04 is the timestamp when I clicked Apply. I believe 20:54:25 is the timestamp the monitors woke from sleep.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1870758, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.