** 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: - [what it looks like, e.g. flickering lines or blocks, which monitor, and when: idle, moving windows, video]. + [flickering lines or blocks, on both monitors, and when: moving windows.] Good: 7.0.0-34-generic, no artifacting in normal use. Bad: 7.0.0-38-generic (the build released to resolute-updates). Also seen on 7.0.0-28. 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 two monitors at different refresh rates, the display shows artifacting: - [flickering lines or blocks, on both monitors, and when: moving windows.] + 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. Good: 7.0.0-34-generic, no artifacting in normal use. Bad: 7.0.0-38-generic (the build released to resolute-updates). Also seen on 7.0.0-28. 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 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. Good: 7.0.0-34-generic, no artifacting in normal use. - Bad: 7.0.0-38-generic (the build released to resolute-updates). Also seen on 7.0.0-28. + 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
