Update — March 20, 2026: After a GDM update (46.2-1ubuntu1~24.04.6), the crash no longer reproduces on this hardware. Tested on both kernel 6.17.0-14 (original crash kernel) and 6.17.0-19 without the initcall_blacklist workaround. GDM now correctly ignores card0 (simpledrm) and goes directly to card1 (amdgpu) on both kernels. The GDM patch local-display-factory-Match-simpledrm-in-a-substring-inst.patch is present and effective on AMD Picasso/Raven2 [1002:15d8]. The underlying kernel-level handoff issue remains — simpledrm still occupies minor 0 and amdgpu gets minor 1 — but the GDM-level fix now prevents the crash on this hardware. Full proof attached.
** Attachment added: "Boot logs from kernel 6.17.0-14 and 6.17.0-19 showing GDM patch now effective on AMD Picasso/Raven2" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2142087/+attachment/5954263/+files/bug-2142087-update-proof.txt -- 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
