[Bug 295567] graphics/drm-612-kmod panics HP 840 G5 laptop

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295567

--- Comment #2 from Cy Schubert <[email protected]> ---
(In reply to Bjoern A. Zeeb from comment #1)

I was considering firmware, a similar issue I had with the Framework last year,
but preloading the firmware didn't resolve it.

Tried verbose boot. Nothing of interest in any messages.

Here is pciconf -lv output.

hostb0@pci0:0:0:0:      class=0x060000 rev=0x08 hdr=0x00 vendor=0x8086
device=0x5914 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM
Registers'
    class      = bridge
    subclass   = HOST-PCI
vgapci0@pci0:0:2:0:     class=0x030000 rev=0x07 hdr=0x00 vendor=0x8086
device=0x5917 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Kaby Lake-R GT2 [UHD Graphics 620]'
    class      = display
    subclass   = VGA
none0@pci0:0:4:0:       class=0x118000 rev=0x08 hdr=0x00 vendor=0x8086
device=0x1903 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal
Subsystem'
    class      = dasp
xhci0@pci0:0:20:0:      class=0x0c0330 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d2f subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP USB 3.0 xHCI Controller'
    class      = serial bus
    subclass   = USB
pchtherm0@pci0:0:20:2:  class=0x118000 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d31 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP Thermal subsystem'
    class      = dasp
ig4iic0@pci0:0:21:0:    class=0x118000 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d60 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP Serial IO I2C Controller'
    class      = dasp
ig4iic1@pci0:0:21:1:    class=0x118000 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d61 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP Serial IO I2C Controller'
    class      = dasp
none1@pci0:0:22:0:      class=0x078000 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d3a subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP CSME HECI'
    class      = simple comms
uart2@pci0:0:22:3:      class=0x070002 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d3d subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP Active Management Technology - SOL'
    class      = simple comms
    subclass   = UART
pcib1@pci0:0:28:0:      class=0x060400 rev=0xf1 hdr=0x01 vendor=0x8086
device=0x9d13 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP PCI Express Root Port'
    class      = bridge
    subclass   = PCI-PCI
pcib2@pci0:0:28:4:      class=0x060400 rev=0xf1 hdr=0x01 vendor=0x8086
device=0x9d14 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP PCI Express Root Port'
    class      = bridge
    subclass   = PCI-PCI
pcib7@pci0:0:29:0:      class=0x060400 rev=0xf1 hdr=0x01 vendor=0x8086
device=0x9d18 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP PCI Express Root Port'
    class      = bridge
    subclass   = PCI-PCI
isab0@pci0:0:31:0:      class=0x060100 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d4e subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point LPC/eSPI Controller'
    class      = bridge
    subclass   = PCI-ISA
none2@pci0:0:31:2:      class=0x058000 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d21 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP PMC'
    class      = memory
hdac0@pci0:0:31:3:      class=0x040380 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d71 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP HD Audio'
    class      = multimedia
    subclass   = HDA
ichsmb0@pci0:0:31:4:    class=0x0c0500 rev=0x21 hdr=0x00 vendor=0x8086
device=0x9d23 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Sunrise Point-LP SMBus'
    class      = serial bus
    subclass   = SMBus
em0@pci0:0:31:6:        class=0x020000 rev=0x21 hdr=0x00 vendor=0x8086
device=0x15d7 subvendor=0x103c subdevice=0x83b2
    vendor     = 'Intel Corporation'
    device     = 'Ethernet Connection (4) I219-LM'
    class      = network
    subclass   = ethernet
iwm0@pci0:1:0:0:        class=0x028000 rev=0x78 hdr=0x00 vendor=0x8086
device=0x24fd subvendor=0x8086 subdevice=0x0010
    vendor     = 'Intel Corporation'
    device     = 'Wireless 8265 / 8275'
    class      = network
pcib3@pci0:2:0:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086
device=0x15da subvendor=0x8086 subdevice=0x0000
    vendor     = 'Intel Corporation'
    device     = 'JHL6340 Thunderbolt 3 Bridge (C step) [Alpine Ridge 2C 2016]'
    class      = bridge
    subclass   = PCI-PCI
pcib4@pci0:3:0:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086
device=0x15da subvendor=0x8086 subdevice=0x0000
    vendor     = 'Intel Corporation'
    device     = 'JHL6340 Thunderbolt 3 Bridge (C step) [Alpine Ridge 2C 2016]'
    class      = bridge
    subclass   = PCI-PCI
pcib5@pci0:3:1:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086
device=0x15da subvendor=0x8086 subdevice=0x0000
    vendor     = 'Intel Corporation'
    device     = 'JHL6340 Thunderbolt 3 Bridge (C step) [Alpine Ridge 2C 2016]'
    class      = bridge
    subclass   = PCI-PCI
pcib6@pci0:3:2:0:       class=0x060400 rev=0x02 hdr=0x01 vendor=0x8086
device=0x15da subvendor=0x8086 subdevice=0x0000
    vendor     = 'Intel Corporation'
    device     = 'JHL6340 Thunderbolt 3 Bridge (C step) [Alpine Ridge 2C 2016]'
    class      = bridge
    subclass   = PCI-PCI
none3@pci0:4:0:0:       class=0x088000 rev=0x02 hdr=0x00 vendor=0x8086
device=0x15d9 subvendor=0x8086 subdevice=0x0000
    vendor     = 'Intel Corporation'
    device     = 'JHL6340 Thunderbolt 3 NHI (C step) [Alpine Ridge 2C 2016]'
    class      = base peripheral
xhci1@pci0:58:0:0:      class=0x0c0330 rev=0x02 hdr=0x00 vendor=0x8086
device=0x15db subvendor=0x8086 subdevice=0x0000
    vendor     = 'Intel Corporation'
    device     = 'JHL6340 Thunderbolt 3 USB 3.1 Controller (C step) [Alpine
Ridge 2C 2016]'
    class      = serial bus
    subclass   = USB
nvme0@pci0:59:0:0:      class=0x010802 rev=0x01 hdr=0x00 vendor=0x15b7
device=0x5030 subvendor=0x15b7 subdevice=0x5030
    vendor     = 'Sandisk Corp'
    device     = 'WD Black SN850X NVMe SSD'
    class      = mass storage
    subclass   = NVM

Did some more testing. Started X outside of xdm. X didn't panic the machine but
the X server hung. The console was unusable when I logged into another machine
to kill it. It required a reboot and reinstall drm-66-kmod and another reboot
to restore functionality. A firmware update made no difference either.

My guess is an i915 register is being set by drm-66 so that when it is
uninstalled and drm-612 installed followed by a reboot that it works until the
next power cycle. This is a Kaby Lake machine.

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