[Bug 217585] graphics/libGL: MESA-LOADER: failed to retrieve device information

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217585

            Bug ID: 217585
           Summary: graphics/libGL: MESA-LOADER: failed to retrieve device
                    information
           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: erisianash at gmail.com
                CC: freebsd-x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

Created attachment 180560
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180560&action=edit
glxinfo output

I'm running the drm-next branch on a Lenovo Thinkpad T450s with Intel HD 5500
graphics.

When testing the CFT for the Xorg 1.18 update gl worked as expected and
modesetting+glamor worked flawlessly, however the Xorg+Mesa update has resulted
in the following:

* X fails to start with the modesetting driver reporting 

MESA-LOADER: failed to retrieve device information
Require OpenGL version 2.1 or later.
(EE)
Fatal server error:
(EE) AddScreen/ScreenInit failed for driver 0

on the console.

* X starts with the intel driver but glxgears causes the screen to stop
updating (except for the mouse pointer. glxinfo prints the same MESA-LOADER
error and also reports "OpenGL renderer string: Mesa DRI Unknown Intel
Chipset".

I've observed this behavior on drm-next and TrueOS.

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