Public bug reported:
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/[email protected]/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
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
** Attachment added: "aggregate of dmesg, unxi output, lspci and prefious-boot
logs"
https://bugs.launchpad.net/bugs/2154075/+attachment/5972838/+files/all-logs.out
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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
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