You have been subscribed to a public bug: Since I switched to a new screen (ASUS VG249Q1R) with higher refesh rate and AMD FreeSync I notice massive flickering and tearing after waking up from standby - but only when FreeSync is activated. The flickering starts to occur on the login interface but continues after logging in and also during full-screen applications like games.
The flickering is resolved in the short run by switching the refresh rate to 60hz (via KDE display settings) and back to the favored higher refresh rate. Alternatively I can turn FreeSync off. When I turn it back on, the flickering recurs after waking up from standby again. As this problem occured to other people after upgrading to Ubuntu 20.04 I assume it is not a hardware problem. The bug seems identical to these reports: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874588 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video- amdgpu/+bug/1885363 My system has the following specifications: CPU: AMD Ryzen 5 3600 GPU: XFX Radeon RX 5600 XT Thicc II Pro OS: Kubuntu 20.04.1 LTS Kernel: 5.4.0-58-generic DE: KDE Plasma 5.18.5 Screen: ASUS VG249Q1R, FHD, 165Hz, FreeSync, … I hope for a solution inside Ubuntu 20.04. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-58-generic 5.4.0-58.64 ProcVersionSignature: Ubuntu 5.4.0-58.64-generic 5.4.73 Uname: Linux 5.4.0-58-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.14 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: usery 1543 F.... pulseaudio /dev/snd/pcmC1D0p: usery 1543 F...m pulseaudio /dev/snd/controlC0: usery 1543 F.... pulseaudio /dev/snd/timer: usery 1543 f.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: KDE Date: Sun Jan 3 23:03:41 2021 InstallationDate: Installed on 2020-04-29 (249 days ago) InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Gigabyte Technology Co., Ltd. X570 I AORUS PRO WIFI ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-58-generic root=/dev/mapper/vgkubuntu-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-58-generic N/A linux-backports-modules-5.4.0-58-generic N/A linux-firmware 1.187.6 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/06/2020 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F12e dmi.board.asset.tag: Default string dmi.board.name: X570 I AORUS PRO WIFI dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF12e:bd03/06/2020:svnGigabyteTechnologyCo.,Ltd.:pnX570IAORUSPROWIFI:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnX570IAORUSPROWIFI:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: Default string dmi.product.name: X570 I AORUS PRO WIFI dmi.product.sku: Default string dmi.product.version: -CF dmi.sys.vendor: Gigabyte Technology Co., Ltd. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal -- Flickering screen after waking up from Standby (Suspend) https://bugs.launchpad.net/bugs/1909942 You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
