No display signal if NVIDIA driver and display scaling is active

[Erik Steiner]

I recently installed Ubuntu 20.04 (20200402) with LVM encryption and automatic logon.
So I enter my encryption password and after the motherboards boot logo it will login automatically to desktop. I also chose the additional drivers and so nvidia-driver-440.
Everything seems to be OK until I select a scaling above 100% (e.g. 200%) in settings. Next reboot, I enter my encryption password. When the automatic logon process should happen, the monitor turns off and says that no display signal is available.

Currently I was able to return to a working setup by pressing CTRL + ALT + F4, login and enter the following commands to remove nvidia-driver and use XORG instead:
sudo apt purge nvidia-driver-440
sudo apt autoremove
sudo reboot

I am pretty sure that the issue will occur again, if I choose NVIDIA driver again.

Any thoughts?

EDIT: On Ubuntu 19.04 I had a similar bug: If I started my PC and the monitor was not turned on, the monitor reported no signal available after turning it on. I was not able to see the boot-up field to enter my encryption password. Unfortunately I didn't test, if I were able to enter my password and logon anyway. Workaround was to turn the monitor on, before starting the PC.

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
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 7 19:31:50 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation GP102 [GeForce GTX 1080 Ti] [10de:1b06] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd GP102 [GeForce GTX 1080 Ti] [1458:3762]
InstallationDate: Installed on 2020-04-05 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200402)
MachineType: Micro-Star International Co., Ltd. MS-7B45
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/03/2019
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: A.80
dmi.board.asset.tag: Default string
dmi.board.name: Z370 GAMING PRO CARBON (MS-7B45)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 2.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 2.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrA.80:bd04/03/2019:svnMicro-StarInternationalCo.,Ltd.:pnMS-7B45:pvr2.0:rvnMicro-StarInternationalCo.,Ltd.:rnZ370GAMINGPROCARBON(MS-7B45):rvr2.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr2.0:
dmi.product.family: Default string
dmi.product.name: MS-7B45
dmi.product.sku: Default string
dmi.product.version: 2.0
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.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

[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.