Public bug reported:

When I switch users via the whisker menu (dm-tool switch-to-greeter) and
login as the second user, I see permanent heavy cpu usage of xorg.

I have tried the nouveau drivers as well without success.

I am currently using the latest nvidia from ppa, but with the official
nvidia drivers from bionic, I had the problem as well.

Logging out and logging in as another user does of course work.

Meaning: I cannot switch users anymore...

Regards,
Holger

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7
ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
Uname: Linux 4.15.0-23-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  390.67  Fri Jun  1 04:04:27 
PDT 2018
 GCC version:  gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: XFCE
Date: Tue Jun 12 18:17:23 2018
DistUpgraded: 2018-05-05 23:16:32,941 ERROR giving up on fetching after maximum 
retries
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.15.0-23-generic, x86_64: installed
 nvidia, 390.67, 4.15.0-23-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation GK208 [GeForce GT 710B] [10de:128b] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] GK208B [GeForce GT 710] 
[1462:8c93]
InstallationDate: Installed on 2017-11-25 (199 days ago)
InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
MachineType: LENOVO 32282P2
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=56904fca-2008-45c6-9012-80c7b14bd698 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to bionic on 2018-05-05 (37 days ago)
dmi.bios.date: 02/23/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: 9SKT9AAUS
dmi.board.name: MAHOBAY
dmi.board.vendor: LENOVO
dmi.board.version: NOK
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvr9SKT9AAUS:bd02/23/2018:svnLENOVO:pn32282P2:pvrThinkCentreM92p:rvnLENOVO:rnMAHOBAY:rvrNOK:cvnLENOVO:ct3:cvrNone:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: 32282P2
dmi.product.version: ThinkCentre M92p
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
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

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic performance ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1776512

Title:
  switching users under xfce causes permanent 100% xorg cpu usage

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