Anyway, for this bug my thinking is that if a different config satisfies the OEM then that can be considered as a semipermanent workaround.
Other than that, it looks like the bug needs to be reported upstream to https://gitlab.freedesktop.org/xorg/driver/xf86-video-ati -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. 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: In Progress 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 To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1923153/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
