** Description changed: Hardware: ASRock B850I Lightning WiFi, Radeon RX 7900 XTX (Navi 31), Raphael iGPU unused for display. Monitors: Samsung LS24AG32x at 165 Hz on DP-1 and LG ULTRAWIDE at 75 Hz on DP-2, both on the RX 7900 XTX. - With the two monitors at different refresh rates, the display shows artifacting: - Flickering lines and blocks appear on both monitors while moving or dragging windows. It doesn't happen when both monitors run at the same refresh rate. - + With the monitors at different refresh rates, flickering lines and blocks appear on both screens, and it is worse on the 75 Hz LG. The most reliable trigger I've found is focusing a window running a terminal UI such as btop or htop. Moving or dragging windows triggers it too. Good: 7.0.0-34-generic, no artifacting in normal use. Bad: 7.0.0-38-generic (the build released to resolute-updates). Possibly related changes in 7.0.0-38 that are not in 7.0.0-34: - drm/amd/display: consolidate DCN vblank/flip handling - drm/amd/display: Fix DTB DTO updates breaking live pixel rate sources - drm/amd/display: Fix mem_type change detection for async flips - the ISM fixes for LP: #2163121 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-38-generic 7.0.0-38.38 ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14 Uname: Linux 7.0.0-38-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Fri Oct 2 14:17:29 2026 InstallationDate: Installed on 2025-11-07 (329 days ago) InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007) IwDevWlp10s0Link: Not connected. MachineType: ASRock B850I Lightning WiFi ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic root=UUID=b80b57ad-ad0b-4866-844f-72c840a6557d ro maxcpus=12 smt=on nvme_core.io_timeout=4 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-02-15 (229 days ago) dmi.bios.date: 06/24/2026 dmi.bios.release: 5.41 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 4.43 dmi.board.asset.tag: Default string dmi.board.name: B850I Lightning WiFi dmi.board.vendor: ASRock dmi.board.version: Default string dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr4.43:bd06/24/2026:br5.41:svnASRock:pnB850ILightningWiFi:pvrDefaultstring:rvnASRock:rnB850ILightningWiFi:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaDefaultstring: dmi.product.family: Default string dmi.product.name: B850I Lightning WiFi dmi.product.sku: Default string dmi.product.version: Default string dmi.sys.vendor: ASRock
** Description changed: Hardware: ASRock B850I Lightning WiFi, Radeon RX 7900 XTX (Navi 31), Raphael iGPU unused for display. Monitors: Samsung LS24AG32x at 165 Hz on DP-1 and LG ULTRAWIDE at 75 Hz on DP-2, both on the RX 7900 XTX. - With the monitors at different refresh rates, flickering lines and blocks appear on both screens, and it is worse on the 75 Hz LG. The most reliable trigger I've found is focusing a window running a terminal UI such as btop or htop. Moving or dragging windows triggers it too. + With the monitors at different refresh rates, flickering lines and blocks appear on both screens, and it is worse at lower refresh rates. The most reliable trigger I've found is focusing a window running a terminal UI such as btop or htop. Moving or dragging windows triggers it too. Good: 7.0.0-34-generic, no artifacting in normal use. Bad: 7.0.0-38-generic (the build released to resolute-updates). Possibly related changes in 7.0.0-38 that are not in 7.0.0-34: - drm/amd/display: consolidate DCN vblank/flip handling - drm/amd/display: Fix DTB DTO updates breaking live pixel rate sources - drm/amd/display: Fix mem_type change detection for async flips - the ISM fixes for LP: #2163121 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-38-generic 7.0.0-38.38 ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14 Uname: Linux 7.0.0-38-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Fri Oct 2 14:17:29 2026 InstallationDate: Installed on 2025-11-07 (329 days ago) InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007) IwDevWlp10s0Link: Not connected. MachineType: ASRock B850I Lightning WiFi ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic root=UUID=b80b57ad-ad0b-4866-844f-72c840a6557d ro maxcpus=12 smt=on nvme_core.io_timeout=4 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-02-15 (229 days ago) dmi.bios.date: 06/24/2026 dmi.bios.release: 5.41 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 4.43 dmi.board.asset.tag: Default string dmi.board.name: B850I Lightning WiFi dmi.board.vendor: ASRock dmi.board.version: Default string dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr4.43:bd06/24/2026:br5.41:svnASRock:pnB850ILightningWiFi:pvrDefaultstring:rvnASRock:rnB850ILightningWiFi:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaDefaultstring: dmi.product.family: Default string dmi.product.name: B850I Lightning WiFi dmi.product.sku: Default string dmi.product.version: Default string dmi.sys.vendor: ASRock -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2169237 Title: amdgpu: display artifacting with mixed refresh rate DP monitors on 7.0.0-38, not on 7.0.0-34 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2169237/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
