[Bug 253258] graphics/mesa-dri: dri is not usable on systems with i965 graphics since 20.2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253258

            Bug ID: 253258
           Summary: graphics/mesa-dri: dri is not usable on systems with
                    i965 graphics since 20.2
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          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 mesa-dri update to version 20.2, dri no longer works on my system.
The following errors and information are reported by glxinfo.

[intel_init_bufmgr: 1936] Kernel 3.9 required.
libGL error: failed to create dri screen
libGL error: failed to load driver: i965

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Mesa/X.org (0xffffffff)
    Device: llvmpipe (LLVM 10.0.1, 128 bits) (0xffffffff)
    Accelerated: no
   OpenGL vendor string: Mesa/X.org
OpenGL renderer string: llvmpipe (LLVM 10.0.1, 128 bits)


During the update the patch extra-src_mesa_drivers_dri_i965_intel__screen.c was
removed. The reactivation of this patch and a subsequent rebuild solves the
problem for me. glxinfo then outputs the following.

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel Open Source Technology Center (0x8086)
    Device: Mesa DRI Intel(R) 965GM (CL) (0x2a02)
    Accelerated: yes
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) 965GM (CL)

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