misc/60817: hanging on boot with amdgpu (Radeon Vega 11 iGPU)

["jake%jakedelmastro.com@localhost via gnats" <gnats-admin%NetBSD.org@localhost>]

>Number:         60817
>Category:       misc
>Synopsis:       hanging on boot with amdgpu (Radeon Vega 11 iGPU)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 28 01:55:00 +0000 2026
>Originator:     Jake Del Mastro
>Release:        NetBSD 11
>Organization:
>Environment:
NetBSD jake_bsd 11.0 NetBSD 11.0 (GENERIC) #0: Thu Jul 30 15:24:12 UTC 2026  mkrepo%mkrepo.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
My system hangs on boot when drmkms_sched & amdgpu modules are loaded. The module seems to load fine and the monitor is set to a native 3840x2160 resolution, sometime after that the system stops after printing:

[  4.2106477] amdgpufb0: framebuffer at 0x7dfvc1000, size 3840x2160, depth 32, stride 15360
[  4.3006455] wsdisplay0 at amdgpufb0 kbdmux 1: console (default, vt100 emulation) using wskbd0

The machine in question is a Lenovo ThinkCentre M715q
It has a Ryzen 2400GE CPU & Radeon Vega 11 iGPU

If I remove the loading of drmkms_sched & amdgpu the system boots normally, but without high resolutions available or GPU acceleration
>How-To-Repeat:
On my ThinkCentre M715q (Ryzen 2400GE CPU w/ Radeon Vega 11 iGPU)

add the following line to /boot.cfg:

menu=Boot normally:rndseed /var/db/entropy-file;load drmkms_sched;load amdgpu;boot

reboot the machine, then the system hangs
>Fix: