[Bug 293362] graphics/nvidia-drm-kmod: No devices on 15.0

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293362

--- Comment #27 from Tomoaki AOKI <[email protected]> ---
(In reply to Martin Cracauer from comment #26)
Tried on main, amd64 at commit base 7d1285e904aa76ac821ac2a6a8eb61be598f0e88
but cannot reproduce. GPU is RTX A400 (Ampere generation of architecture) and
iGPU in 

The previous test before submitting 595.58.03 was done at commit base
60baee1fa4848ac969522e03d2c6f273f334edb7.

Tests below are done in mate-terminal on Xorg with Mate DE in conjunction with
Compiz.
No crash. No hang.

% pkg version -v | rg nvidia
linux-nvidia-libs-devel-595.58.03  =   up-to-date with index
nvidia-driver-devel-595.58.03      =   up-to-date with index
nvidia-drm-66-kmod-devel-595.58.03.1600014 =   up-to-date with index
nvidia-drm-kmod-devel-595.58.03    =   up-to-date with index
nvidia-kmod-devel-595.58.03.1600014 =   up-to-date with index
nvidia-settings-595.58.03          =   up-to-date with index
nvidia-xconfig-595.58.03           =   up-to-date with index
% nvidia-smi               
Sun Mar 29 23:11:02 2026       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 595.58.03              Driver Version: 595.58.03      CUDA
Version: N/A      |
+-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile
Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util 
Compute M. |
|                                         |                        |           
   MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA RTX A400                Off |   00000000:01:00.0  On |           
      N/A |
| 30%   55C    P5            N/A  /   50W |     831MiB /   4094MiB |     18%   
  Default |
|                                         |                        |           
      N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                   
          |
|  GPU   GI   CI              PID   Type   Process name                       
GPU Memory |
|        ID   ID                                                              
Usage      |
|=========================================================================================|
|    0   N/A  N/A           12061      G   /usr/local/libexec/Xorg             
   639MiB |
|    0   N/A  N/A           12250      G   /usr/local/bin/compiz               
     3MiB |
|    0   N/A  N/A           12328      G   /usr/local/bin/ghostty              
    31MiB |
|    0   N/A  N/A           12358      G   /usr/local/bin/firefox              
   119MiB |
+-----------------------------------------------------------------------------------------+
% nv-sglrun nvidia-smi
/usr/local/lib/libc6-shim/libc6.so: shim init
Sun Mar 29 23:18:12 2026       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 595.58.03              Driver Version: 595.58.03      CUDA
Version: 13.2     |
+-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile
Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util 
Compute M. |
|                                         |                        |           
   MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA RTX A400                Off |   00000000:01:00.0  On |           
      N/A |
| 30%   58C    P5            N/A  /   50W |     891MiB /   4094MiB |     32%   
  Default |
|                                         |                        |           
      N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                   
          |
|  GPU   GI   CI              PID   Type   Process name                       
GPU Memory |
|        ID   ID                                                              
Usage      |
|=========================================================================================|
|  No running processes found                                                  
          |
+-----------------------------------------------------------------------------------------+
% nv-sglrun clpeak    
/usr/local/lib/libc6-shim/libc6.so: shim init

Platform: NVIDIA CUDA
  Device: NVIDIA RTX A400
    Driver version  : 595.58.03 (FreeBSD)
    Compute units   : 6
    Clock frequency : 1762 MHz

    Global memory bandwidth (GBPS)
      float   : 80.72
      float2  : 83.21
      float4  : 84.34
      float8  : 84.09
      float16 : 85.96

    Single-precision compute (GFLOPS)
      float   : 2516.60
      float2  : 2681.06
      float4  : 2634.55
      float8  : 2631.24
      float16 : 2596.91

    No half precision support! Skipped

    Double-precision compute (GFLOPS)
      double   : 43.46
      double2  : 43.35
      double4  : 43.26
      double8  : 42.91
      double16 : 42.61

    Integer compute (GIOPS)
      int   : 1320.92
      int2  : 1382.16
      int4  : 1372.96
      int8  : 1369.21
      int16 : 1371.15

    Integer compute Fast 24bit (GIOPS)
      int   : 1278.19
      int2  : 1375.36
      int4  : 1339.27
      int8  : 1374.09
      int16 : 1315.69

    Integer char (8bit) compute (GIOPS)
      char   : 1205.77
      char2  : 1285.39
      char4  : 1199.33
      char8  : 1043.17
      char16 : 973.28

    Integer short (16bit) compute (GIOPS)
      short   : 1212.13
      short2  : 1258.57
      short4  : 1228.73
      short8  : 1028.46
      short16 : 971.19

    Transfer bandwidth (GBPS)
      enqueueWriteBuffer              : 9.47
      enqueueReadBuffer               : 9.46
      enqueueWriteBuffer non-blocking : 9.48
      enqueueReadBuffer non-blocking  : 9.50
      enqueueMapBuffer(for read)      : 11.93
        memcpy from mapped ptr        : 11.44
      enqueueUnmap(after write)       : 12.85
        memcpy to mapped ptr          : 12.62

    Kernel launch latency : 6.35 us

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