Public bug reported: ## Summary System freezes with dcn32_program_compbuf_size REG_WAIT timeout on AMD RX 7900 XTX (RDNA3/Navi31) running kernel 7.0.0-15-generic on Ubuntu 26.04.
## Hardware - CPU: AMD Ryzen 9 9950X3D - GPU: Sapphire PULSE RX 7900 XTX (Navi31, rev c8) - RAM: 64GB - Display: HDMI ## Kernel errors observed amdgpu 0000:03:00.0: [drm] REG_WAIT timeout 1us * 100 tries - dcn32_program_compbuf_size line:147 amdgpu 0000:03:00.0: [drm] REG_WAIT timeout 1us * 100 tries - dcn32_program_compbuf_size line:148 workqueue: dm_handle_vmin_vmax_update [amdgpu] hogged CPU for >10000us 11 times ## Steps to reproduce 1. Boot Ubuntu 26.04 with RX 7900 XTX 2. Use GPU-accelerated applications (browser + VS Code + llama.cpp with ROCm) 3. System freezes within minutes to hours 4. REISUB required to recover ## Attempted workarounds (none fully resolved) - amdgpu.dcfeaturemask=0x8 (partial, reduces frequency) - amdgpu.dcdebugmask=0x10 (no effect) - amdgpu.gpu_recovery=1 (recovery attempt fails) ## Additional context - Bug appears related to DCN32 display compression buffer programming - Triggered more frequently under GPU compute load (ROCm/llama.cpp) - Previously reported upstream: https://gitlab.freedesktop.org/drm/amd/-/issues ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-15-generic 7.0.0-15.15 ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0 Uname: Linux 7.0.0-15-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: KDE Date: Mon May 11 09:55:17 2026 InstallationDate: Installed on 2026-05-03 (8 days ago) InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) MachineType: ASRock X870E Nova WiFi ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-15-generic root=UUID=5b6bf59c-b6e2-4ba8-8520-45b350ff8bad ro quiet splash amdgpu.dcfeaturemask=0x8 amdgpu.dcdebugmask=0x10 amdgpu.dc=1 amdgpu.abmlevel=0 acpi_enforce_resources=lax module_blacklist=btusb,bluetooth kho=off amdgpu.gpu_recovery=1 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/16/2026 dmi.bios.release: 5.41 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 4.20 dmi.board.asset.tag: Default string dmi.board.name: X870E Nova 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.:bvr4.20:bd04/16/2026:br5.41:svnASRock:pnX870ENovaWiFi:pvrDefaultstring:rvnASRock:rnX870ENovaWiFi:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaDefaultstring: dmi.product.family: Default string dmi.product.name: X870E Nova WiFi dmi.product.sku: Default string dmi.product.version: Default string dmi.sys.vendor: ASRock ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2152163 Title: RX 7900 XTX: dcn32_program_compbuf_size REG_WAIT timeout causes system freeze on kernel 7.0.0-15 (RDNA3) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2152163/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
