I just encountered the same bug yesterday. I was running a custom kernel that did not have KMS enabled, and the radeon driver (6.14.4-1) crashes with a segfault upon startup (regardless of the KMS setting in modprobe, so it's not the setting but the KMS itself that made the difference). Downgrading to 6.14.3-2 resolves the problem.
Today, I rebuilt the kernel with KMS enabled, and now 6.14.4-1 works without any problem. T -- "I'm not childish; I'm just in touch with the child within!" - RL -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org