I have a Radeon 5700 XT and Ryzen 3900X as well. My symptoms are a bit different though. I'm running 2 identical monitors at 2560x1440 120Hz. Flickering affects both monitors simultaneously. As in they flicker at exactly the same time. Often related to how much is changing on the screen. They normally start flickering right after login, even off a fresh boot. People are discussing this over at https://bbs.archlinux.org/viewtopic.php?id=253272 and they say it is solved by kernel 5.4, but I am on linux-image-5.4.0-42-generic and it still flickers.
Running this does stop the flickering for me: xrandr --output DisplayPort-1 --mode 1024x768; sleep 1; xrandr --output DisplayPort-1 --mode 2560x1440 -r 120 Interestingly I only have to run it for one monitor, not both and it stops the flickering for both. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1874588 Title: Flickering screen after waking up from Suspend Status in linux package in Ubuntu: Incomplete Bug description: Just did a fresh install of Ubuntu 20.04 LTS and everything was fine, display worked perfect. Then I put the machine in Suspend mode (by clicking on GUI button), left for 5 minutes, came back, woke up the machine (by clicking a key on the keyboard), and upon waking up, the display started flickering heavily. Relevant Specs (Sorry if I missed anything): AMD® Ryzen 9 3900x 12-core processor × 24 AMD® Radeon rx 5700 xt GNOME version 3.36.1 Windowing System X11 I am running 3 monitors: Samsung with resolution 3840x2160 and 2 LG monitors with resolution 1920x1080, all at 60Hz Most of the flickering is happening on Samsung, although once in a while, other monitors flicker a little bit as well. Things to note: When I switch Samsung to lower resolution, the flickering goes away. When I come back to 3840x2160, it comes back. When I switch to lower resolution, suspend and come back, everything is fine. If I reboot the machine, the display is fine until I suspend and wake up again (if I am in higher resolution). I tried changing the refresh rate of Samsung to 30.00 and 29.97 (the only two available when I turn off FreeSync), and the issue still persists. Turning FreeSync on and off does nothing. Thank you, Pavel. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-26-generic 5.4.0-26.30 ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30 Uname: Linux 5.4.0-26-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: pavel 1870 F.... pulseaudio /dev/snd/controlC0: pavel 1870 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Thu Apr 23 21:14:00 2020 InstallationDate: Installed on 2020-04-23 (0 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: System manufacturer System Product Name ProcEnviron: LANGUAGE=en_CA:en PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_CA.UTF-8 SHELL=/bin/bash ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-26-generic root=UUID=02f6301e-c22b-462d-a4e5-71a78b7eb203 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-26-generic N/A linux-backports-modules-5.4.0-26-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/19/2019 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1405 dmi.board.asset.tag: Default string dmi.board.name: TUF GAMING X570-PLUS (WI-FI) dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1405:bd11/19/2019:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnTUFGAMINGX570-PLUS(WI-FI):rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874588/+subscriptions -- 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
