Public bug reported:
Hi
1)
$ lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04
2)
$ apt-cache policy xorg
xorg:
Installed: 1:7.7+19ubuntu14
Candidate: 1:7.7+19ubuntu14
Version table:
*** 1:7.7+19ubuntu14 500
500 http://cl.archive.ubuntu.com/ubuntu focal/main amd64 Packages
100 /var/lib/dpkg/status
3) What you expected to happen
I have a "HP EliteBook 840 G5 (3RF31LT#ABM)" laptop with ubuntu 20.04
Also I have a Dell dock model k17a connected with 2 monitors.
The physical display is the following:
laptop(landscape) | monitor 1 (landscape) | monitor 2 (portrait right)
When I connect the USB-C plug, I expect nothing special but having 2
more display
4) What happened instead
When I connect the USB-C plug, the whole UX gets super slow
Xorg and gnome-shell are the top 2 cpu-consuming process and both inside the
same CPU2
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 16 16:50:08 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Hewlett-Packard Company UHD Graphics 620 [103c:83b2]
InstallationDate: Installed on 2021-04-04 (11 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: HP HP EliteBook 840 G5
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-50-generic
root=UUID=e6947647-3679-496c-8309-dbae876553c4 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/18/2018
dmi.bios.release: 3.0
dmi.bios.vendor: HP
dmi.bios.version: Q78 Ver. 01.03.00
dmi.board.name: 83B2
dmi.board.vendor: HP
dmi.board.version: KBC Version 04.53.00
dmi.chassis.asset.tag: 5CG8364L0N
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.ec.firmware.release: 4.83
dmi.modalias:
dmi:bvnHP:bvrQ78Ver.01.03.00:bd07/18/2018:br3.0:efr4.83:svnHP:pnHPEliteBook840G5:pvr:rvnHP:rn83B2:rvrKBCVersion04.53.00:cvnHP:ct10:cvr:
dmi.product.family: 103C_5336AN HP EliteBook
dmi.product.name: HP EliteBook 840 G5
dmi.product.sku: 3RF31LT#ABM
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 20.2.6-0ubuntu0.20.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.2
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+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal performance ubuntu
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https://bugs.launchpad.net/bugs/1924814
Title:
Lag in laptop + ununtu20.04 + dock = 3 Displays
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