[Bug 237544] graphics/drm-fbsd12.0-kmod: panic on 12-STABLE with Radeon HD 7450 (but not with drm-fbsd11.2-kmod)
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Date: Tue, 28 Dec 2021 00:05:56 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237544
Bill Paul <noisetube@gmail.com> changed:
What |Removed |Added
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CC| |noisetube@gmail.com
--- Comment #6 from Bill Paul <noisetube@gmail.com> ---
Unfortunately, this bug is still present, even using FreeBSD 12.3-RELEASE.
Note that I have observed it with several Radeon cards, so it doesn't appear
specific to a particular card. The same problem does not happen with the Intel
i915kms.ko driver from the same package.
Based on the hint here, I created my own drm-fbsd11.2-kmod port (the original
has been deleted from the repo as obsolete) and massaged it a bit to compile on
FreeBSD 12.3, and that version works without crashing.
I suspect there is a locking problem somewhere in the drm or ttm modules in the
newer code. Sadly, nobody seems to care enough to fix it. (And I don't
understand the code well enough to fix it myself. The differences between the
4.11 and 4.16 versions of the driver are substantial.)
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