** Description changed: Description: After upgrading linux-firmware from 20240318.git3b128b60-0ubuntu2.27 to 0ubuntu2.29 on 2026-08-14, the display output became corrupted: the right portion of the screen shows dense vertical blue/green/white stripes. The corruption appears as soon as the GDM login screen shows up and persists on the desktop. Hardware: GPU: Gigabyte Radeon RX 6900 XT (Navi 21, 1002:73af), amdgpu driver Motherboard: ASUS TUF GAMING X570-PLUS (WI-FI), BIOS 1407 CPU: AMD Ryzen 9 3900X Monitors: Dell U2719D (2560x1440 via DisplayPort), LG (via HDMI) OS: Ubuntu 24.04 LTS What I observed: The corruption is not present in UEFI BIOS or GRUB — it only appears once amdgpu takes over the display. Screenshots taken while the stripes are visible are completely clean, so the rendered framebuffer is correct and only the display output is affected. Reproduces on both monitors, on both DP and HDMI, and with only a single monitor connected — so it is not cable, port or monitor related. Reproduces identically on kernel 7.0.0-28-generic and on 6.17.0-40-generic, so it is not a kernel regression. GPU temperatures are normal (edge 48C, junction 59C, mem 52C) and there are no amdgpu errors, ring timeouts or GPU resets in dmesg. Forcing a fixed memory clock (power_dpm_force_performance_level=manual, pp_dpm_mclk=3) does not help. Relevant dmesg line: amdgpu 0000:0c:00.0: [drm] Wait for DMUB auto-load failed: 3 Steps to reproduce: Install linux-firmware 20240318.git3b128b60-0ubuntu2.29 on a Navi 21 system. Reboot. Vertical stripes appear on the right part of the screen from the login screen onward. Workaround: Downgrading to linux-firmware 20240318.git3b128b60-0ubuntu2.26, running sudo update-initramfs -u and rebooting fixes the issue completely. Re- upgrading to 2.29 brings it back. Expected: clean display output, as with 2.26/2.27. Actual: corrupted display output on the right portion of the screen. + + Additional evidence after downgrading to 2.26. + + With linux-firmware 2.29 (corrupted output): + + amdgpu 0000:0c:00.0: [drm] Wait for DMUB auto-load failed: 3 + amdgpu 0000:0c:00.0: [drm] DMUB hardware initialized: version=0x01000000 + + With linux-firmware 2.26 (clean output): + + amdgpu 0000:0c:00.0: [drm] Loading DMUB firmware via PSP: version=0x02020020 + amdgpu 0000:0c:00.0: [drm] DMUB hardware initialized: version=0x02020020 ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: linux-firmware 20240318.git3b128b60-0ubuntu2.26 ProcVersionSignature: Ubuntu 7.0.0-28.28~24.04.1-generic 7.0.12 Uname: Linux 7.0.0-28-generic x86_64 ApportVersion: 2.28.3-0ubuntu0.1 Architecture: amd64 CRDA: N/A CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Sun Aug 16 08:34:31 2026 Dependencies: firmware-sof-signed 2023.12.1-1ubuntu1.11 InstallationDate: Installed on 2026-01-11 (217 days ago) InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1) MachineType: System manufacturer System Product Name ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic root=UUID=8c531cd3-a6bb-451c-b85a-dce6260d430d ro quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-7.0.0-28-generic N/A linux-backports-modules-7.0.0-28-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.26 SourcePackage: linux-firmware UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/01/2020 dmi.bios.release: 5.14 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1407 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.:bvr1407:bd04/01/2020:br5.14:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnTUFGAMINGX570-PLUS(WI-FI):rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.: 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
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163591 Title: Vertical stripes on right half of screen after boot with RX 6900 XT (Navi 21) — regression in linux-firmware 2.29 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2163591/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
