External monitor keeps blinking and not connected, with Kubuntu Linux (KDE)

--- en
Always, almost every time I turn on my notebook, my LG external monitor keeps blinking and it takes a while to actually connect to the notebook and the external monitor screen to turn on. For the external monitor to work I change the video settings using Ctrl + P and turn the monitor off/on several times. In Kubuntu it is recognized but when it blinks the system thinks the monitor is off.
I'm using Kubuntu 23.04, I've used other distributions on the same hardware and this problem hasn't happened. I believe it's something with KDE.

--- pt-br
Sempre, quase toda vez que ligo meu notebook, meu monitor externo LG fica piscando e demora para realmente conectar ao notebook e a tela do monitor externo ligar. Para o monitor externo funcionar eu mudo as configurações de vídeo usando Ctrl + P e desligo/ligo o monitor várias vezes. No Kubuntu ele é reconhecido mas quando fica piscando o sistema acha que o monitor está desligado.
Estou usando o Kubuntu 23.04, já usei outras distribuições no mesmo hardware e esse problema não aconteceu. Eu acredito que seja algo com o KDE.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: xorg 1:7.7+23ubuntu2
ProcVersionSignature: Ubuntu 6.2.0-36.37-generic 6.2.16
Uname: Linux 6.2.0-36-generic x86_64
ApportVersion: 2.26.1-0ubuntu2.1
Architecture: amd64
BootLog: Error: [Errno 13] Permissão negada: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: KDE
Date: Sat Nov 11 07:52:24 2023
DistUpgraded: 2023-11-02 07:28:00,578 DEBUG /openCache(), new cache size 78921
DistroCodename: lunar
DistroVariant: ubuntu
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series] [1002:15d8] (rev c1) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series] [17aa:3804]
InstallationDate: Installed on 2022-10-23 (383 days ago)
InstallationMedia: Kubuntu 22.10 "Kinetic Kudu" - Release amd64 (20221020)
MachineType: LENOVO 81V7
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.2.0-36-generic root=UUID=d72b8a6b-953f-4b38-8b0a-d1e9b6899ad2 ro quiet splash iommu=soft vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to lunar on 2023-11-02 (9 days ago)
dmi.bios.date: 05/19/2020
dmi.bios.release: 1.25
dmi.bios.vendor: LENOVO
dmi.bios.version: BUCN25WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40688WIN
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad S145-15API
dmi.ec.firmware.release: 1.25
dmi.modalias: dmi:bvnLENOVO:bvrBUCN25WW:bd05/19/2020:br1.25:efr1.25:svnLENOVO:pn81V7:pvrLenovoIdeaPadS145-15API:rvnLENOVO:rnLNVNB161216:rvrSDK0J40688WIN:cvnLENOVO:ct10:cvrLenovoIdeaPadS145-15API:skuLENOVO_MT_81V7_BU_idea_FM_IdeaPadS145-15API:
dmi.product.family: IdeaPad S145-15API
dmi.product.name: 81V7
dmi.product.sku: LENOVO_MT_81V7_BU_idea_FM_IdeaPad S145-15API
dmi.product.version: Lenovo IdeaPad S145-15API
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.114-1
version.libgl1-mesa-dri: libgl1-mesa-dri 23.0.4-0ubuntu1~23.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.7-1ubuntu3.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1