I have another reproduction of this issue on an HP laptop with AMD Picasso/Raven2 graphics.
Hardware: * HP 15s-eq0003nv * Product number: 8RU92EA * Board ID: 86FD * AMD Ryzen 5 3500U * Radeon Vega / Picasso / Raven2 * Kubuntu * Kernel 7.0.0-30 and 7.0.0-31 * BIOS F.79, dated 2026-04-16 After the BIOS update to F.79, normal Linux graphics boot began failing with a black screen and a flashing/reappearing mouse cursor. The failed boot showed: simpledrm initialized on DRM minor 0 Then AMDGPU initialized on minor 1: "amdgpu 0000:04:00.0: initializing kernel modesetting (RAVEN 0x1002:0x15D8 0x103C:0x86FD 0xC2)" "[drm] Initialized amdgpu 3.64.0 for 0000:04:00.0 on minor 1" KWin then failed with: "kwin_wayland_drm: Atomic modeset test failed! No such device" "KMS: DRM_IOCTL_MODE_CREATE_DUMB failed: No such device" "kwin_core: Failed to open /dev/dri/renderD128 device (No such device)" "kwin_wayland_drm: Primary gpu has been removed! Quitting..." I tested both kernels, X11 vs Wayland, blacklisting hp_wmi, and adding amdgpu to the initramfs. None fixed normal KMS boot. The decisive test was: initcall_blacklist=simpledrm_platform_driver_init without nomodeset. That immediately fixed the graphical boot. I then made it permanent with: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash initcall_blacklist=simpledrm_platform_driver_init" After rebooting, including into kernel 7.0.0-31, the system boots normally. Before the workaround, the problematic boot had simpledrm as DRM card0/minor 0 and amdgpu as card1/minor 1. After the workaround, the system has the working amdgpu card0 and renderD128. This looks like another hardware reproduction of the Picasso/Raven2 simpledrm/amdgpu handoff problem. The exact workaround from this report also fixed my machine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2142087 Title: simpledrm fails to hand off /dev/dri/card0 to amdgpu on Picasso/Raven2, causing GDM crash and black screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2142087/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
