[Bug 2154075] Re: [REGRESSION] ASUS Zenbook S16 UM5606GA (Ryzen AI 9 HX470) graphical freeze before login with Ubuntu 26.04 kernel 7.0.x, fixed by kernel 6.17

** Tags added: kernel-daily-bug -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2154075 Title: [REGRESSION] ASUS Zenbook S16 UM5606GA (Ryzen AI 9 HX470) graphical freeze before login with Ubuntu 26.04 kernel 7.0.x, fixed by kernel 6.17 Status in linux package in Ubuntu: New Bug description: System experiences a reproducible graphical freeze during boot on Ubuntu 26.04 when using Ubuntu kernel 7.0.x. Hardware: * ASUS Zenbook S16 UM5606GA * AMD Ryzen AI 9 HX470 * integrated AMD graphics * BIOS version: UM5606GA.305 * BIOS date: 2026-02-25 * Secure Boot enabled Affected kernels: * 7.0.0-15-generic (fails) Known-good kernels: * 6.17.0-29-generic (works correctly) The issue appears shortly before the graphical login prompt should appear. Symptoms: * display freezes before login screen * mouse cursor may briefly move after resume from suspend * GUI remains visually frozen * keyboard and GUI actions occasionally appear after subsequent wake events * SSH access continues to function normally * system does not panic or reboot This suggests the kernel remains operational while the graphics/display stack hangs. Environment: * Ubuntu 26.04 userspace * GNOME * both Wayland and Xorg tested * same Mesa userspace for both working and failing kernels Regression evidence: The following configuration changes were tested and reverted unless otherwise noted: 1. Booting Ubuntu 26.04 live environment using "Safe graphics" Result: * works correctly 2. Booting installed system with: nomodeset Result: * works correctly * accelerated graphics unavailable 3. GRUB: set gfxpayload=keep Result: * Ubuntu live environment boots correctly in safe graphics mode 4. Kernel parameter: amdgpu.dcdebugmask=0x12 Result: * no improvement 5. Kernel parameter: amdgpu.mes=0 Result: * no improvement 6. Kernel parameter: amdgpu.dc=0 Result: * system freezes earlier during splash screen * SSH remains operational 7. Kernel parameter: initcall_blacklist=simpledrm_platform_driver_init Result: * no improvement 8. Kernel parameter: pcie_aspm=off Result: * no improvement 9. Forced Xorg instead of Wayland Result: * same behavior 10. Replaced /lib/firmware/amdgpu firmware files with Ubuntu 24.04 versions Result: * no improvement * reverted afterward 11. Ubuntu 24.04 live environment Result: * boots correctly without safe graphics 12. Installed Ubuntu kernel: 6.17.0-29-generic Packages installed: * linux-headers-6.17.0-29-generic * linux-image-6.17.0-29-generic * linux-modules-6.17.0-29-generic * linux-tools-6.17.0-29-generic Result: * fully stable system * accelerated graphics functional * graphical login works correctly * suspend/resume functional Current working kernel: Linux aeon 6.17.0-29-generic #29-Ubuntu SMP PREEMPT_DYNAMIC Tue May 5 19:42:34 UTC 2026 x86_64 GNU/Linux Conclusion: This appears to be a regression introduced in Ubuntu kernel 7.0.x affecting AMDGPU graphics initialization or display handling on Ryzen AI 9 HX470 / Strix Point hardware. The issue does not appear specific to: * GNOME * Wayland * Xorg * userspace Mesa because the same userspace environment works correctly under kernel 6.17. Suspected subsystem: * amdgpu * DRM/DCN * DMUB/DMCUB * modesetting * display core * Ryzen AI / Strix Point graphics enablement Potential duplicates / related reports: 1. Bug #2148753 linux-firmware-amd-graphics graphical boot regression on Ryzen AI ASUS Zenbook systems https://bugs.launchpad.net/ubuntu/+source/linux-firmware-amd-graphics/+bug/2148753 Mirror: https://www.mail-archive.com/ubuntu-bugs@lists.ubuntu.com/msg6269039.html 2. Bug #2147541 Ryzen AI platform regression under Ubuntu 26.04 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2147541 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 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CasperMD5CheckResult: pass Date: Sat May 23 17:32:03 2026 InstallationDate: Installed on 2026-05-15 (8 days ago) InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) MachineType: ASUS Zenbook S16 UM5606GA 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=/vmlinuz-7.0.0-15-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash 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. SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/25/2026 dmi.bios.release: 5.35 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: UM5606GA.305 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UM5606GA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.ec.firmware.release: 3.3 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUM5606GA.305:bd02/25/2026:br5.35:efr3.3:svnASUS:pnZenbookS16UM5606GA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUM5606GA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaZenbookS16: dmi.product.family: Zenbook S16 dmi.product.name: Zenbook S16 UM5606GA dmi.product.version: 1.0 dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2154075/+subscriptions