[Bug 259670] graphics/drm-510-kmod: sporadic GPU hang with i915kms

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259670

--- Comment #25 from [email protected] ---
(In reply to Torsten Zuehlsdorff from comment #24)

Hangs still exists, but now they crash Xorg only from time to time, even 
rarely the whole OS (no kernel panic usually), using modesetting nowe -

Mar 20 02:19:38 Thinkpad kernel: drmn0: [drm] GPU HANG: ecode 4:1:fdffffff, in
MainThread [100717]
Mar 20 02:19:38 Thinkpad kernel: drmn0: [drm] Resetting chip for stopped
heartbeat on rcs0
Mar 20 02:19:38 Thinkpad kernel: drmn0: [drm] *ERROR* failed to set rcs0 head
to zero ctl 00000400 head 70e01634 tail 00000000 start 00004000
Mar 20 02:19:38 Thinkpad kernel: drmn0: [drm] Xorg[100717] context reset due to
GPU hang

<...>

Mar 20 19:59:01 Thinkpad kernel: drmn0: [drm] *ERROR* CPU pipe A FIFO underrun

$ pkg info | grep 'drm'
drm-61-kmod-6.1.128.1404500_8  Direct Rendering Manager GPU drivers
libdrm-2.4.131,1               Direct Rendering Manager library and headers

$ pkg info | grep 'mesa'                                                
mesa-demos-8.5.0               OpenGL demos distributed with Mesa
mesa-dri-24.1.7_11             OpenGL hardware acceleration drivers for DRI2+
mesa-libs-24.1.7_1             OpenGL libraries that support GLX and EGL
clients

$ kldstat                                                               
Id Refs Address                Size Name
 1   50 0xffffffff80200000   f71530 kernel
 2    1 0xffffffff81173000    1b2a0 snd_uaudio.ko
 3    2 0xffffffff8118f000     5530 hid.ko
 4    1 0xffffffff81195000     f020 uhci.ko
 5    1 0xffffffff811a5000    74348 if_em.ko
 6    1 0xffffffff8221a000    13ad8 ehci.ko
 7    1 0xffffffff82a20000     3560 fdescfs.ko
 8    1 0xffffffff82a24000   1df228 i915kms.ko
 9    2 0xffffffff82c04000    85090 drm.ko
10    2 0xffffffff82c8a000     4120 linuxkpi_video.ko
11    3 0xffffffff82c8f000     7350 dmabuf.ko
12    3 0xffffffff82c97000     3378 lindebugfs.ko
13    1 0xffffffff82c9b000     c338 ttm.ko

FreeBSD 14.4-STABLE #0 stable/14-5f55c59cbab5: Wed Mar 18 15:47:10 CET 2026    
root@Thinkpad:/usr/obj/usr/src/amd64.amd64/sys/STRIPPED amd64

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