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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1923153

Title:
  [radeon] Display output laggy from iGPU when operating on desktop with
  attaching AMD R7 430 graphic (dGPU)

Status in OEM Priority Project:
  Confirmed
Status in xserver-xorg-driver-ati:
  New
Status in xorg-server package in Ubuntu:
  New
Status in xserver-xorg-video-ati package in Ubuntu:
  New

Bug description:
  [Steps to reproduce this issue]

  1. Install a focal base image
  2. Attach an AMD R7 430 graphic as dGPU without connecting any monitor on it.
  3. Attach DP monitor on iGPU (no matter the iGPU is Intel(i915), or 
AMD(amdgpu)).
  4. After logging it, the display shows laggy.

  [Additional information]
  1. doesn't see this issue if selecting 'Wayland'

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xserver-xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.10.0-1019.20-oem 5.10.18
  Uname: Linux 5.10.0-1019-oem x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Apr  9 16:23:42 2021
  DistUpgraded: Fresh install
  DistributionChannelDescriptor:
   # This is the distribution channel descriptor for the OEM CDs
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-stella-focal-amd64-20210324-1458+pc-stella-cmit-focal-amd64+X00
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Oland [Radeon HD 8570 / R7 240/340 / 
Radeon 520 OEM] [1002:6611] (rev 87) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Oland [Radeon HD 8570 / R7 240/340 / 
Radeon 520 OEM] [103c:3375]
   Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev da) (prog-if 
00 [VGA controller])
     Subsystem: Hewlett-Packard Company Renoir [103c:872b]
  InstallationDate: Installed on 2021-04-09 (0 days ago)
  InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 
20210324-23:53
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.10.0-1019-oem 
root=UUID=027c2398-aef7-43d2-a339-6a2163287914 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/30/2020
  dmi.bios.release: 2.0
  dmi.bios.vendor: HP
  dmi.bios.version: S09 Ver. 02.02.00
  dmi.board.name: 872B
  dmi.board.vendor: HP
  dmi.board.version: KBC Version 09.94.00
  dmi.chassis.type: 3
  dmi.chassis.vendor: HP
  dmi.ec.firmware.release: 9.148
  dmi.modalias: 
dmi:bvnHP:bvrS09Ver.02.02.00:bd12/30/2020:br2.0:efr9.148:svnHP:pn:pvr:rvnHP:rn872B:rvrKBCVersion09.94.00:cvnHP:ct3:cvr:
  dmi.product.family: 103C_53307F HP EliteDesk
  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 N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  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

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