[Bug 250011] graphics/libdrm: "MESA-LOADER: failed to retrieve device information" since 2.4.102

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250011

            Bug ID: 250011
           Summary: graphics/libdrm: "MESA-LOADER: failed to retrieve
                    device information" since 2.4.102
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: lhersch at dssgmbh.de
          Assignee: x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)

Since the update of libdrm to 2.4.102 my graphics device is no longer
recognized by mesa.
The mesa-libs then fall back on the i915-dri-driver on my system. But there is
an Intel i965GM in my system. If an OpenGL application is started now, I get a
black screen and can only reset the laptop to get a display again. The
following error is logged in messages.
error: [drm:pid12:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
This is of course due to the wrong driver.
If I force the correct driver using the environment variable
MESA_LOADER_DRIVER_OVERRIDE=i965, the OpenGL applications work again.

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