[Bug 239065] devel/libpciaccess-0.14 breaks x11-drivers/xf86-video-vesa-2.4.0_2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239065

            Bug ID: 239065
           Summary: devel/libpciaccess-0.14 breaks
                    x11-drivers/xf86-video-vesa-2.4.0_2
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs at FreeBSD.org
          Reporter: george at m5p.com

I'm running FreeBSD 11.2-RELEASE-p10.  My ports tree is (mostly) at revision
506139.  In the process of doing a partial ports update yesterday, I upgraded
from libpciaccess-0.13.5 to 0.14, and I could no longer run my display (which
uses the xorg vesa driver).

I'm running xorg-7.7_3, xorg-server-1.18.4_11,1, and xf86-video-vesa-2.4.0_2.

With libpciaccess-0.14, this line shows up in Xorg.0.log:

[    88.312] vesa: Ignoring device with a bound kernel driver

and the X server dies.  With version 0.13.5, the above line does not appear and
everything works.

According to pciconf -lv, my display controller is:

vgapci0 at pci0:6:0:0:     class=0x030000 card=0xd0001458 chip=0x15dd1002 rev=0xc8
hdr=0x00
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]'
    class      = display
    subclass   = VGA

As far as I have been able to tell, only the VESA driver supports this on
FreeBSD so far.  Please let me know how to help debug this (though I'm set for
the moment after downgrading to libpciaccess-0.13.5).

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