[Bug 271391] i915kms

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271391

            Bug ID: 271391
           Summary: i915kms
           Product: Ports & Packages
           Version: Latest
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: daeron@optushome.com.au

i915kms panics freezing machine, 13.2-RELEASE
- Have two Lenovo ThinkCentre Intel(R) Core(TM) i5-6400T CPU with HD 530
graphics.

Loaded from boot same
Loaded from rc.conf same
Loaded from first line in rc.conf same
Loaded manually by kldload same but does display partial report, such as:

drmn0: <drmn> on vgapci0
vgapci0: child drmn0 requested pci_enable_io
vgapci0: child drmn0 requested pci_enable_io

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 02
fault virtual address = 0x2147b000
fault code            = supervisor write data, reserved bits in PTE
instruction pointer   = 0x20:0x1434820
stack pointer         = 0x28:0x2e5165b0
frame pointer         = 0x28:0x2e5165bc
code segment          = base 0x0, limit 0xfffff, type 0x1b
                      = DPL 0, pres 1, def32 1, gran 1
processor eflags      = interrupt enabled, resume, IOPL = 0
current process       = 1252 (kldload)
trap number           = 12
panic: page fault
cpuid = 1
time = 1683991363
KDB: stack backtrace:
#0 0x10704bf at kdb_backtrace+0x4f
#1 0x1028ab4 at vpanic+0xf4
#2 0x10289b4 at panic+0x14
#3 0x142ea36 at trap_fatal+0x346
#4 0x142ea70 at trap_pfault+0x30
#5 0x142e081 at trap+0x2a1
#6 0xffc0321f at dma_fence_stub+0xd0544e6b
#7 0x28 at ll+0x7

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