gdm3 will start in a new tty after suspend

[João V.]

I'm not sure if there is any related info in log files because there is no actual crash or error messages.

Im using Ubuntu 18.04 and Gnome3 on Xorg. Also, I have a NVidia GT520M with nvidia-390 driver installed through ubuntu-drivers utility. Cant confirm that is a graphics driver issue because I installed it on a fresh Ubuntu.

Description
===

Whenever I suspend my laptop (e.g. close lid) and then turn it on, a new session will be opened in tty2 causing two graphical sessions being executed at the same time (?)

Workaround
===

I found a workaround that simply requires to Log Out from the 2nd session (tty2) and pressing Ctrl+Alt+F1 to go back to the original Xorg session. After that the Login screen will appear.

The background image will get pixelized and very distorted when the 2nd Xorg session is loaded. Will try to add a screenshot as attachment.

Also, this bug could lead to "bypass" the login menu. I was able to change session without being asked for user password: one is stuck at the login screen and the other is logged in already. Not sure if it is a security issue because it would require a successful authentication beforehand.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-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.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 390.48 Thu Mar 22 00:42:57 PDT 2018
 GCC version: gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
ApportVersion: 2.20.9-0ubuntu7.3
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Sun Sep 16 14:47:50 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus: nvidia, 390.48, 4.15.0-34-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. 2nd Generation Core Processor Family Integrated Graphics Controller [1043:1682]
 NVIDIA Corporation GF119M [GeForce GT 520M] [10de:1050] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. GF119M [GeForce GT 520M] [1043:1682]
InstallationDate: Installed on 2018-08-19 (28 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: ASUSTeK Computer Inc. K53SJ
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-34-generic root=UUID=d07ee961-7df7-4a6a-9fc9-10d6724a7e9b ro quiet splash intel_pstate=enable vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/26/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: K53SJ.315
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: K53SJ
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK53SJ.315:bd09/26/2011:svnASUSTeKComputerInc.:pnK53SJ:pvr1.0:rvnASUSTeKComputerInc.:rnK53SJ:rvr1.0:cvnASUSTeKComputerInc.:ct9:cvr1.0:
dmi.product.family: K
dmi.product.name: K53SJ
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

[João V. (joaovarelas)]

screenshot of how it looks like right after powering it on from suspend/sleep mode. (tty2)

[João V. (joaovarelas)]

https://askubuntu.com/questions/896971/problem-with-display-after-suspending

It looks like a NVIDIA bug.