Public bug reported:

My PC has an Nvidia G98 video card with a single monitor (HP ZR22w)
connected over DisplayPort. When I turn the monitor off and switch it
back on, the screen remains black. The monitor displays its "no signal"
message.

This only happens while logged in, either with the default Gnome-Shell
interface or without a desktop environment. More precisely, if the
current console is the GUI session on tty2 when I switch the monitor on,
the monitor does not receive any signal. If the current console is the
Gdm login screen on tty1 or a text mode login screen on tty3, the
display turns on normally.

Running xrandr shows "DP-2 connected primary 1920x1080+0+0 (normal left
inverted right x axis y axis) 475mm x 267mm" when the monitor is on,
even when the screen remains black. It shows DP-2 as disconnected while
the monitor is off.

The attached log file Xorg.1.log shows a session where I log in, then
turn the monitor off and turn it back on a few seconds later. X does
notice that the monitor has been turned on, yet the screen remains
black.

Switching consoles after turning the monitor on does not help. To get
the display back, the current console has to be something other than the
logged-in console at the time the monitor is switched on. Another
workaround is to run "xset dpms force off; xset dpms force on" when the
screen is black after switching the monitor on.

This happens since I upgraded from Ubuntu 16.04 to 18.04.

I had assistance writing this bug report, I can only type in the
terminal whatever I am told.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-video-nouveau 1:1.0.15-2
ProcVersionSignature: Ubuntu 4.15.0-54.58-generic 4.15.18
Uname: Linux 4.15.0-54-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,imgpng,gnomecompat,mousepoll,place,session,vpswitch,wall,regex,animation,move,snap,grid,fade,resize,unitymtgrabhandles,expo,ezoom,scale,workarounds,unityshell]
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 30 10:52:07 2019
DistUpgraded: 2019-06-29 14:02:39,816 ERROR got error from PostInstallScript 
./xorg_fix_proprietary.py (g-exec-error-quark: L'exécution du processus fils « 
./xorg_fix_proprietary.py » a échoué (No such file or directory) (8))
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation G98 [Quadro NVS 295] [10de:06fd] (rev a1) (prog-if 00 [VGA 
controller])
   Subsystem: NVIDIA Corporation G98 [Quadro NVS 295] [10de:062e]
InstallationDate: Installed on 2016-10-28 (974 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Hewlett-Packard HP Compaq 8000 Elite CMT PC
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-54-generic 
root=/dev/mapper/vg1-lv_ubuntu ro quiet splash vt.handoff=1
SourcePackage: xserver-xorg-video-nouveau
UpgradeStatus: Upgraded to bionic on 2019-06-29 (0 days ago)
dmi.bios.date: 10/22/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786G7 v01.02
dmi.board.asset.tag: CZC113CLV8
dmi.board.name: 3647h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: CZC113CLV8
dmi.chassis.type: 6
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr786G7v01.02:bd10/22/2009:svnHewlett-Packard:pnHPCompaq8000EliteCMTPC:pvr:rvnHewlett-Packard:rn3647h:rvr:cvnHewlett-Packard:ct6:cvr:
dmi.product.family: 103C_53307F
dmi.product.name: HP Compaq 8000 Elite CMT PC
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
version.libdrm2: libdrm2 2.4.95-1~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.8-0ubuntu0~18.04.2
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.8-0ubuntu0~18.04.2
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
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
xserver.bootTime: Sat Jun 29 11:10:16 2019
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        PIXART USB OPTICAL MOUSE MOUSE, id 8
 input        AT Translated Set 2 keyboard KEYBOARD, id 9
 input        HP WMI hotkeys       KEYBOARD, id 10
xserver.errors:
 Failed to load module "nvidia" (module does not exist, 0)
 Failed to load module "nvidia" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.8
xserver.video_driver: nouveau

** Affects: xserver-xorg-video-nouveau (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic ubuntu

** Attachment added: "Xorg.1.log"
   https://bugs.launchpad.net/bugs/1834770/+attachment/5274208/+files/Xorg.1.log

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/1834770

Title:
  Black screen when switching the monitor on after upgrade to 18.04

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