Public bug reported:

on my laptop (xiaomi notebook pro), ubuntu 18.10 amd64, standart ubuntu desktop 
(gnome-shell), no application running
just activate second display in gnome tweak, let it lock itself
the fan is going fast, simply moving the mouse and the fan slow down.
wrote a simple script to append a top every minut in a log file, show that 
gnome-shell consumes 100% when locked.
workaround : disabling second displaying and no more CPU usage / fan noise when 
locked.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: xorg 1:7.7+19ubuntu8
ProcVersionSignature: Ubuntu 4.18.0-13.14-generic 4.18.17
Uname: Linux 4.18.0-13-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  415.27  Thu Dec 20 17:25:03 
CST 2018
 GCC version:  gcc version 8.2.0 (Ubuntu 8.2.0-7ubuntu1)
ApportVersion: 2.20.10-0ubuntu13.1
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: ubuntu:GNOME
Date: Thu Jan 31 16:19:16 2019
DistUpgraded: 2018-12-30 21:42:17,971 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
DistroCodename: cosmic
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 415.27, 4.18.0-13-generic, x86_64: installed
 virtualbox, 5.2.18, 4.18.0-13-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA 
controller])
   Subsystem: Xiaomi UHD Graphics 620 [1d72:1701]
   Subsystem: Xiaomi Mi Notebook Pro [GeForce MX150] [1d72:1701]
InstallationDate: Installed on 2018-06-08 (236 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: Timi TM1701
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic 
root=UUID=174e8747-a737-411b-bfaf-4e6795426fea ro quiet splash nouveau.runpm=0 
vt.handoff=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to cosmic on 2018-12-30 (31 days ago)
dmi.bios.date: 10/13/2017
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: XMAKB5R0P0502
dmi.board.asset.tag: Any
dmi.board.name: TM1701
dmi.board.vendor: Timi
dmi.board.version: MP
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Timi
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnINSYDECorp.:bvrXMAKB5R0P0502:bd10/13/2017:svnTimi:pnTM1701:pvr:rvnTimi:rnTM1701:rvrMP:cvnTimi:ct10:cvrChassisVersion:
dmi.product.family: Timibook
dmi.product.name: TM1701
dmi.sys.vendor: Timi
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.95-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.2.2-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.1-3ubuntu2.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-3

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


** Tags: amd64 apport-bug cosmic performance ubuntu

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https://bugs.launchpad.net/bugs/1814125

Title:
  gnome-shell eats 100% cpu when seconds display is on and screen is
  locked

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1814125/+subscriptions

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