i915kms and chip resets on rsc0?

All,

I have finally gotten my old laptop somewhat back to it
2 Dec 2020 working state.  The kernel/world/drm-current-kmod
from 2 Dec 2020 worked wonderfully.  Sadly, the two week
recover from a failed update has one final hurdle.

With nearly top-of-tree src/ and ports/

% cd /usr/src
% git log | more
commit 0e01ea872ee475d7aef11d21588504e2ef4eb32c
Author: Cy Schubert <[email protected]>
Date:   Wed Jan 27 21:52:08 2021 -0800

% pkg info | grep kmod
drm-current-kmod-5.4.62.g20210128 DRM modules for the linuxkpi-based KMS components
gpu-firmware-kmod-g20201213    Firmware modules for the linuxkpi-based KMS components

when I start x11, the screen flickers for 15-30 seconds
where apparently the i915kms modules is resetting the 
GPU.  This is a new previously unseen behavior.  Eventually,
the X server comes up and I can my normal desktop.  I've
trimmed dmesg output to include info about the system.


-- 
D 14.0-CURRENT #4 main-c256341-g0e01ea872ee-dirty: Wed Jan 27 17:11:57 PST 2021
    root@mobile:/usr/obj/usr/src/i386.i386/sys/MOBILE i386
FreeBSD clang version 11.0.1 ([email protected]:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)
VT(vga): resolution 640x480
CPU: Intel(R) Core(TM)2 Duo CPU     T7250  @ 2.00GHz (1995.04-MHz 686-class CPU)
  Origin="GenuineIntel"  Id=0x6fd  Family=0x6  Model=0xf  Stepping=13
  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>
  Features2=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
  AMD Features=0x20100000<NX,LM>
  AMD Features2=0x1<LAHF>
  VT-x: (disabled in BIOS) HLT,PAUSE
  TSC: P-state invariant, performance statistics
real memory  = 4294967296 (4096 MB)
avail memory = 4178866176 (3985 MB)


vgapci0: <VGA-compatible display> port 0xeff8-0xefff mem 0xfea00000-0xfeafffff,0xe0000000-0xefffffff irq 16 at device 2.0 on pci0
agp0: <Intel GM965 SVGA controller> on vgapci0
WARNING: Device "agp" is Giant locked and may be deleted before FreeBSD 13.0.
agp0: aperture size is 256M, detected 7676k stolen memory
vgapci0: Boot video device
vgapci1: <VGA-compatible display> mem 0xfeb00000-0xfebfffff at device 2.1 on pci0

atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64,0x62,0x66 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
WARNING: Device "psm" is Giant locked and may be deleted before FreeBSD 13.0.
psm0: model GlidePoint, device ID 0
orm0: <ISA Option ROMs> at iomem 0xc0000-0xcefff,0xcf000-0xcffff pnpid ORM0000 on isa0


ugen4.2: <Logitech USB Receiver> at usbus4
ukbd0 on uhub2
ukbd0: <Logitech USB Receiver, class 0/0, rev 2.00/12.03, addr 2> on usbus4
kbd2 at ukbd0
ums0 on uhub2
ums0: <Logitech USB Receiver, class 0/0, rev 2.00/12.03, addr 2> on usbus4
ums0: 16 buttons and [XYZT] coordinates ID=2
uhid0 on uhub2
uhid0: <Logitech USB Receiver, class 0/0, rev 2.00/12.03, addr 2> on usbus4
drmn0: <drmn> on vgapci0
vgapci0: child drmn0 requested pci_enable_io
vgapci0: child drmn0 requested pci_enable_io
[drm] Unable to create a private tmpfs mount, hugepage support will be disabled(-19).
Successfully added WC MTRR for [0xe0000000-0xefffffff]: 0; 
[drm] Got stolen memory base 0x0, size 0x0
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] Connector LVDS-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.LVDS-1
[drm]   - kern.vt.fb.default_mode
[drm] Connector VGA-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.VGA-1
[drm]   - kern.vt.fb.default_mode
[drm] Connector DVI-D-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.DVI-D-1
[drm]   - kern.vt.fb.default_mode
[drm] Connector SVIDEO-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.SVIDEO-1
[drm]   - kern.vt.fb.default_mode
[drm] RC6 disabled, disabling runtime PM support
[drm] Initialized overlay support.
sysctl_warn_reuse: can't re-use a leaf (hw.dri.debug)!
[drm] Initialized i915 1.6.0 20190822 for drmn0 on minor 0
WARNING: Device "fb" is Giant locked and may be deleted before FreeBSD 13.0.
VT: Replacing driver "vga" with new "fb".
start FB_INFO:
type=11 height=1050 width=1400 depth=32
cmsize=16 size=5914624
pbase=0xe0020000 vbase=0x24e20000
name=drmn0 flags=0x0 stride=5632 bpp=32
cmap[0]=0 cmap[1]=7f0000 cmap[2]=7f00 cmap[3]=c4a000
end FB_INFO
drmn0: fb0: i915drmfb frame buffer device
drmn0: GPU HANG: ecode 4:1:0x8b9192dd, in MainThread [100156], hang on rcs0
drmn0: Resetting chip for hang on rcs0
drmn0: Resetting chip for hang on rcs0
drmn0: Resetting chip for hang on rcs0
drmn0: Resetting chip for hang on rcs0
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
tun0: link state changed to UP
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: Resetting chip for hang on rcs0
Asynchronous wait on fence i915:Xorg[100156]:4 timed out (hint:0x24ad37f0S)
drmn0: GPU recovery timed out, cancelling all in-flight rendering.
drmn0: Resetting chip for hang on rcs0



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