[Bug 249922] graphics/drm-kmod is not stable with "AccelMethod" "sna" (Intel GM45 Express Chipset)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249922

--- Comment #2 from Jan Beich <jbeich at FreeBSD.org> ---
Also, try upgrading to -CURRENT because drm-fbsd11.2-kmod and drm-fbsd12.0-kmod
are unlikely to be fixed unless you provide a patch.

According to the manpage SNA stands for Sandybridge's New Acceleration. GM45
(Gen4) predates Sandybridge (Gen6). Upstream has a lot of code to support gen4
and gen >= 045 in particular. However, bug 214593 disabled SNA by default due
to crashes on pre-Sandybridge. If drm-kmod made SNA work but has graphical
glitches then it's an improvement. This is why trying newer DRM drivers
(i915kms, radeonkms, etc) even on old handware is important.

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