[Bug 274814] graphics/drm-515-kmod System locks up when i915kms loaded on 14.0-RC3

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274814

            Bug ID: 274814
           Summary: graphics/drm-515-kmod System locks up when i915kms
                    loaded on 14.0-RC3
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: david@fiander.info
             Flags: maintainer-feedback?(x11@FreeBSD.org)
          Assignee: x11@FreeBSD.org

I've got a Lenovo ThinkCentre with an Alder Lake i7-12700T. This processor
includes integrated Intel® UHD Graphics 770. When I run 'fwget' it reports

Needed firmware packages: 'gpu-firmware-intel-kmod-alderlake
gpu-firmware-intel-kmod-tigerlake'

I've installed drm-kmod, and it pulled in drm-515-kmod.

The machine boots fine, but when I run

$ kldload i915kms

the system locks up and I have to power cycle it. /var/log messages provides
these messages from before the crash:

Oct 28 16:32:41 victoria kernel: iic0: <I2C generic I/O> on iicbus0
Oct 28 16:32:42 victoria kernel: drmn0: <drmn> on vgapci0
Oct 28 16:32:42 victoria kernel: vgapci0: child drmn0 requested pci_enable_io
Oct 28 16:32:42 victoria syslogd: last message repeated 1 times
Oct 28 16:32:42 victoria kernel: drmn0: [drm] Incompatible option enable_guc=-1
- undocumented flag
Oct 28 16:32:42 victoria kernel: [drm] Unable to create a private tmpfs mount,
hugepage support will be disabled(-19).
Oct 28 16:32:42 victoria kernel: [drm] Got stolen memory base 0x4b800000, size
0x4000000
Oct 28 16:32:42 victoria kernel: lkpi_iic0: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus1: <Philips I2C bus> on lkpi_iic0
Oct 28 16:32:42 victoria kernel: iic1: <I2C generic I/O> on iicbus1
Oct 28 16:32:42 victoria kernel: lkpi_iic1: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus2: <Philips I2C bus> on lkpi_iic1
Oct 28 16:32:42 victoria kernel: iic2: <I2C generic I/O> on iicbus2
Oct 28 16:32:42 victoria kernel: lkpi_iic2: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus3: <Philips I2C bus> on lkpi_iic2
Oct 28 16:32:42 victoria kernel: iic3: <I2C generic I/O> on iicbus3
Oct 28 16:32:42 victoria kernel: lkpi_iic3: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus4: <Philips I2C bus> on lkpi_iic3
Oct 28 16:32:42 victoria kernel: iic4: <I2C generic I/O> on iicbus4
Oct 28 16:32:42 victoria kernel: lkpi_iic4: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus5: <Philips I2C bus> on lkpi_iic4
Oct 28 16:32:42 victoria kernel: iic5: <I2C generic I/O> on iicbus5
Oct 28 16:32:42 victoria kernel: lkpi_iic5: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus6: <Philips I2C bus> on lkpi_iic5
Oct 28 16:32:42 victoria kernel: iic6: <I2C generic I/O> on iicbus6
Oct 28 16:32:42 victoria kernel: lkpi_iic6: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus7: <Philips I2C bus> on lkpi_iic6
Oct 28 16:32:42 victoria kernel: iic7: <I2C generic I/O> on iicbus7
Oct 28 16:32:42 victoria kernel: lkpi_iic7: <LinuxKPI I2C> on drmn0
Oct 28 16:32:42 victoria kernel: iicbus8: <Philips I2C bus> on lkpi_iic7
Oct 28 16:32:42 victoria kernel: iic8: <I2C generic I/O> on iicbus8
Oct 28 16:32:42 victoria kernel: lkpi_iic8: <LinuxKPI I2C>
Oct 28 16:32:42 victoria kernel:  on drmn0
Oct 28 16:32:42 victoria kernel: iicbus9: <Philips I2C bus> on lkpi_iic8
Oct 28 16:32:42 victoria kernel: iic9: <I2C generic I/O> on iicbus9
Oct 28 16:32:42 victoria kernel: drmn0: successfully loaded firmware image
'i915/adls_dmc_ver2_01.bin'
Oct 28 16:32:42 victoria kernel: drmn0: [drm] Finished loading DMC firmware
i915/adls_dmc_ver2_01.bin (v2.1)
Oct 28 16:32:42 victoria kernel: drmn0: successfully loaded firmware image
'i915/tgl_guc_62.0.0.bin'
Oct 28 16:32:42 victoria kernel: drmn0: successfully loaded firmware image
'i915/tgl_huc_7.9.3.bin'

Here's the CPU information reported at boot time:

Oct 28 10:28:53 victoria kernel: CPU: 12th Gen Intel(R) Core(TM) i7-12700T
(1382.40-MHz K8-class CPU)
Oct 28 10:28:53 victoria kernel:   Origin="GenuineIntel"  Id=0x90672 
Family=0x6  Model=0x97  Stepping=2
Oct 28 10:28:53 victoria kernel:  
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
Oct 28 10:28:53 victoria kernel:  
Features2=0x7ffafbff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
Oct 28 10:28:53 victoria kernel:   AMD
Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
Oct 28 10:28:53 victoria kernel:   AMD Features2=0x121<LAHF,ABM,Prefetch>
Oct 28 10:28:53 victoria kernel:   Structured Extended
Features=0x239c27eb<FSGSBASE,TSCADJ,BMI1,AVX2,FDPEXC,SMEP,BMI2,ERMS,INVPCID,NFPUSG,RDSEED,ADX,SMAP,CLFLUSHOPT,CLWB,PROCTRACE,SHA>
Oct 28 10:28:53 victoria kernel:   Structured Extended
Features2=0x98c027bc<UMIP,PKU,OSPKE,WAITPKG,GFNI,VAES,VPCLMULQDQ,TME,RDPID,MOVDIRI,MOVDIR64B>
Oct 28 10:28:53 victoria kernel:   Structured Extended
Features3=0xfc1cc410<FSRM,MD_CLEAR,PCONFIG,IBT,IBPB,STIBP,L1DFL,ARCH_CAP,CORE_CAP,SSBD>
Oct 28 10:28:53 victoria kernel:   XSAVE
Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES>
Oct 28 10:28:53 victoria kernel:  
IA32_ARCH_CAPS=0xfd6b<RDCL_NO,IBRS_ALL,SKIP_L1DFL_VME,MDS_NO,TAA_NO>
Oct 28 10:28:53 victoria kernel:   VT-x:
PAT,HLT,MTF,PAUSE,EPT,UG,VPID,VID,PostIntr
Oct 28 10:28:53 victoria kernel:   TSC: P-state invariant, performance
statistics

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