I have the flickering problem with 2560x1440 screens, AMD Radeon RX 550. tried it on two screens: asus and samsung. asus is capable of freesync, samsung not. asus can handle higher frequency, samsung 50Hz only.
On samsung it works without any problems. On asus monitor I have the same flickering problem on 75Hz, switching down to 60Hz solves the problem. I'm on Ubuntu 18.10, kernel 4.18.0-16. - with very intense flickering. Upgraded to 5.0.2 kernel manually, seems like flickering is a little bit better. -- 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/1811863 Title: [amdgpu + nvidia PCI passthrough] Screen flickering on ultra wide Status in xorg-server package in Ubuntu: New Status in xserver-xorg-video-amdgpu package in Ubuntu: New Bug description: I'm running 18.04 including all updates on an LG 38WK95C at 3840x1600@75. I'm experiencing constant flickering on screen when setting the refresh rate to 75Hz in settings. When I set to refresh rate to 60Hz, the flicking is gone. When enabeling freesync in the monitor's settings, the 60Hz isn't available and the only choices are 29.99Hz or 75Hz, which again causes flickering. This looks like the same issue in bug #1749975. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: xorg 1:7.7+19ubuntu7.1 ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18 Uname: Linux 4.15.0-43-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Tue Jan 15 16:43:10 2019 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu DkmsStatus: amdgpu, 18.50-708488, 4.15.0-43-generic, x86_64: installed nvidia, 415.25, 4.15.0-29-generic, x86_64: installed nvidia, 415.25, 4.15.0-43-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: NVIDIA Corporation Device [10de:1f02] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3734] Advanced Micro Devices, Inc. [AMD/ATI] Polaris12 [1002:699f] (rev c7) (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] Lexa PRO [Radeon RX 550] [1462:8a90] InstallationDate: Installed on 2019-01-02 (12 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic root=UUID=9ac85046-be6e-411d-a51c-10b221c750d0 ro splash quiet iommu=1 amd_iommu=on vt.handoff=1 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/18/2018 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.80 dmi.board.name: B450 Pro4 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.80:bd12/18/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB450Pro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To Be Filled By O.E.M. dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.91-2 version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1 version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1811863/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
