Bug 278363

Summary:	linsysfs: /sys/class/drm and /sys/dev/char/226:* contents don't match /dev/dri
Product:	Base System	Reporter:	Alex S <iwtcex>
Component:	kern	Assignee:	freebsd-emulation (Nobody) <emulation>
Status:	New ---
Severity:	Affects Only Me	CC:	emaste
Priority:	---
Version:	Unspecified
Hardware:	Any
OS:	Any

Description Alex S 2024-04-14 15:27:07 UTC

There are two significant issues here:

1. linsysfs creates entries for everything that has vgapci attached to it, regardless of whether the GPU has any associated /dev/dri/card* nodes — this might (and occasionally does) result in Mesa's libGL picking the wrong driver in multi-GPU configurations;

2. there are no entries for /dev/dri/renderD* nodes, which breaks Vulkan initialization, forcing Mesa to choose the software rendering fallback.

(See https://github.com/freebsd/drm-kmod/issues/290 and https://forums.freebsd.org/threads/linuxulator-vs-intel-amd-gpus.92445/ for context.)