>Synopsis:      X11 graphics not working in snapshots on Braswell system
>Category:      amd64
>Environment:
        System      : OpenBSD 6.5
        Details     : OpenBSD 6.5-current (GENERIC.MP) #131: Fri Jul 19 
13:18:29 MDT 2019
                         
dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

        Architecture: OpenBSD.amd64
        Machine     : amd64
>Description:
        Under 6.5 (release plus syspatches), X11 works with the default
        configuration.  Over the last several weeks, I've been trying
        snapshots, and none has worked correctly:
        - With the default configuration, the box usually switches to screen 4
          but displays nothing, and becomes unresponsive to keyboard, mouse,
          and pings, therefore requiring hard reset.  Without xenodm enabled
          in /etc/rc.conf.local, using
             rcctl -f start xenodm; sleep 120; rcctl -f stop xenodm
          the system survived the most recent test without full lockup.
          See below for relevant logs.
        - Forcing the Intel driver using a configuration file, things do work
          somewhat, but glxinfo/glxgears give errors.
          See below for relevant logs.
>How-To-Repeat:
        Start X11 without a configuration file.
>Fix:
        Unknown.


dmesg:
OpenBSD 6.5-current (GENERIC.MP) #131: Fri Jul 19 13:18:29 MDT 2019
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8415350784 (8025MB)
avail mem = 8150167552 (7772MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.8 @ 0xece40 (53 entries)
bios0: vendor American Megatrends Inc. version "EB120IMS.830" date 08/26/2016
bios0: Micro-Star International Co., Ltd. MS-B120
acpi0 at bios0: ACPI 5.0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT FIDT MCFG SLIC SSDT SSDT SSDT UEFI LPIT CSRT
acpi0: wakeup devices XHC1(S4) HDEF(S4) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) 
PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) BRC1(S0)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Celeron(R) CPU N3060 @ 1.60GHz, 1600.48 MHz, 06-4c-04
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,MOVBE,POPCNT,DEADLINE,AES,RDRAND,NXE,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,TSC_ADJUST,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN
cpu0: 1MB 64b/line 16-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 80MHz
cpu0: mwait min=64, max=64, C-substates=0.2.0.0.0.0.3.3, IBE
cpu1 at mainbus0: apid 4 (application processor)
cpu1: Intel(R) Celeron(R) CPU N3060 @ 1.60GHz, 1600.01 MHz, 06-4c-04
cpu1: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,PCLMUL,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,MOVBE,POPCNT,DEADLINE,AES,RDRAND,NXE,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,TSC_ADJUST,SMEP,ERMS,MD_CLEAR,IBRS,IBPB,STIBP,SENSOR,ARAT,MELTDOWN
cpu1: 1MB 64b/line 16-way L2 cache
cpu1: smt 0, core 2, package 0
ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 115 pins
acpimcfg0 at acpi0
acpimcfg0: addr 0xe0000000, bus 0-255
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (RP01)
acpiprt2 at acpi0: bus 2 (RP02)
acpiprt3 at acpi0: bus 3 (RP03)
acpiprt4 at acpi0: bus -1 (RP04)
acpiec0 at acpi0: not present
acpicpu0 at acpi0: C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: C1(1000@1 mwait.1), PSS
acpipwrres0 at acpi0: CLK0, resource for CAMD
acpipwrres1 at acpi0: CLK0, resource for CAM1
acpipwrres2 at acpi0: CLK1, resource for CAM2, CAM3
acpipwrres3 at acpi0: USBC, resource for XHC1
acpipwrres4 at acpi0: FN00, resource for FAN0
acpitz0 at acpi0: critical temperature is 95 degC
acpicmos0 at acpi0
acpipci0 at acpi0 PCI0: 0x00000000 0x00000011 0x00000001
"BCM2E64" at acpi0 not configured
"BCM4752" at acpi0 not configured
"SMO91D0" at acpi0 not configured
"INTCF1C" at acpi0 not configured
"MSFT0002" at acpi0 not configured
"PNP0C14" at acpi0 not configured
acpibtn0 at acpi0: SLPB
"PNP0C14" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
cpu0: using VERW MDS workaround
cpu0: Enhanced SpeedStep 1600 MHz: speeds: 1601, 1600, 1520, 1440, 1360, 1280, 
1200, 1120, 1040, 960, 880, 800, 720, 640, 560, 480 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Braswell Host" rev 0x35
inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics" rev 0x35
drm0 at inteldrm0
inteldrm0: msi
sdhc0 at pci0 dev 16 function 0 vendor "Intel", unknown product 0x2294 rev 
0x35: apic 1 int 16
sdhc0: SDHC 3.0, 200 MHz base clock
sdmmc0 at sdhc0: 8-bit, sd high-speed, mmc high-speed, dma
ahci0 at pci0 dev 19 function 0 "Intel Braswell AHCI" rev 0x35: msi, AHCI 1.3.1
ahci0: port 0: 6.0Gb/s
ahci0: PHY offline on port 1
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, KINGSTON SUV400S, 0C3J> SCSI3 0/direct 
fixed naa.0550380440010000
sd0: 114473MB, 512 bytes/sector, 234441648 sectors, thin
xhci0 at pci0 dev 20 function 0 "Intel Braswell xHCI" rev 0x35: msi, xHCI 1.0
usb0 at xhci0: USB revision 3.0
uhub0 at usb0 configuration 1 interface 0 "Intel xHCI root hub" rev 3.00/1.00 
addr 1
"Intel Braswell TXE" rev 0x35 at pci0 dev 26 function 0 not configured
azalia0 at pci0 dev 27 function 0 "Intel Braswell HD Audio" rev 0x35: msi
azalia0: codecs: Realtek/0x0283, Intel/0x2883, using Realtek/0x0283
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel Braswell PCIE" rev 0x35: msi
pci1 at ppb0 bus 1
iwm0 at pci1 dev 0 function 0 "Intel Dual Band Wireless AC 3160" rev 0x83, msi
ppb1 at pci0 dev 28 function 1 "Intel Braswell PCIE" rev 0x35: msi
pci2 at ppb1 bus 2
ppb2 at pci0 dev 28 function 2 "Intel Braswell PCIE" rev 0x35: msi
pci3 at ppb2 bus 3
re0 at pci3 dev 0 function 0 "Realtek 8168" rev 0x0c: RTL8168G/8111G (0x4c00), 
msi, address xx:xx:xx:xx:xx:xx
rgephy0 at re0 phy 7: RTL8251 PHY, rev. 0
pcib0 at pci0 dev 31 function 0 "Intel Braswell PCU LPC" rev 0x35
ichiic0 at pci0 dev 31 function 3 "Intel Braswell SMBus" rev 0x35: apic 1 int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-14200 SO-DIMM
spdmem1 at iic0 addr 0x51: 4GB DDR3 SDRAM PC3-14200 SO-DIMM
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: probed fifo depth: 15 bytes
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vmm0 at mainbus0: VMX/EPT (using slow L1TF mitigation)
sdmmc0: can't enable card
uhub1 at uhub0 port 4 configuration 1 interface 0 "Apple, Inc. Keyboard Hub" 
rev 2.00/95.15 addr 2
uhidev0 at uhub1 port 2 configuration 1 interface 0 "Apple, Inc Apple Keyboard" 
rev 2.00/0.69 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 5 key codes, country code 33
wskbd1 at ukbd0 mux 1
uhidev1 at uhub1 port 2 configuration 1 interface 1 "Apple, Inc Apple Keyboard" 
rev 2.00/0.69 addr 3
uhidev1: iclass 3/0
uhid0 at uhidev1: input=1, output=0, feature=0
uhidev2 at uhub1 port 3 configuration 1 interface 0 "Logitech USB Optical 
Mouse" rev 2.00/43.01 addr 4
uhidev2: iclass 3/1
ums0 at uhidev2: 8 buttons, Z and W dir
wsmouse0 at ums0 mux 0
ugen0 at uhub0 port 5 "Intel product 0x07dc" rev 2.00/0.01 addr 5
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
root on sd0a (deadbeefdeadbeef.a) swap on sd0b dump on sd0b
WARNING: / was not properly unmounted
inteldrm0: 1920x1080, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
wskbd1: connecting to wsdisplay0
wsdisplay0: screen 1-5 added (std, vt100 emulation)
iwm0: hw rev 0x160, fw ver 16.242414.0, address xx:xx:xx:xx:xx:xx

usbdevs:
Controller /dev/usb0:
addr 01: 8086:0000 Intel, xHCI root hub
         super speed, self powered, config 1, rev 1.00
         driver: uhub0
addr 02: 05ac:1006 Apple, Inc., Keyboard Hub
         high speed, power 300 mA, config 1, rev 95.15, iSerial 000000000000
         driver: uhub1
addr 03: 05ac:0220 Apple, Inc, Apple Keyboard
         low speed, power 20 mA, config 1, rev 0.69
         driver: uhidev0
         driver: uhidev1
addr 04: 046d:c019 Logitech, USB Optical Mouse
         low speed, power 100 mA, config 1, rev 43.01
         driver: uhidev2
addr 05: 8087:07dc Intel, product 0x07dc
         full speed, self powered, config 1, rev 0.01
         driver: ugen0

Xorg.log.0 [with the default X config]:
[  1384.084] (WW) checkDevMem: failed to open /dev/xf86 and /dev/mem
        (Operation not permitted)
        Check that you have set 'machdep.allowaperture=1'
        in /etc/sysctl.conf and reboot your machine
        refer to xf86(4) for details
[  1384.084]    linear framebuffer access unavailable
[  1384.148] (--) Using wscons driver on /dev/ttyC4
[  1384.161] 
X.Org X Server 1.19.7
Release Date: 2019-03-02
[  1384.161] X Protocol Version 11, Revision 0
[  1384.161] Build Operating System: OpenBSD 6.5 amd64 
[  1384.161] Current Operating System: OpenBSD obscure.loc.rlr.id.au 6.5 
GENERIC.MP#131 amd64
[  1384.162] Build Date: 19 July 2019  01:47:01PM
[  1384.162]  
[  1384.162] Current version of pixman: 0.38.4
[  1384.162]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[  1384.162] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  1384.162] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Jul 20 21:20:37 
2019
[  1384.163] (==) Using system config directory 
"/usr/X11R6/share/X11/xorg.conf.d"
[  1384.163] (==) No Layout section.  Using the first Screen section.
[  1384.163] (==) No screen section available. Using defaults.
[  1384.163] (**) |-->Screen "Default Screen Section" (0)
[  1384.164] (**) |   |-->Monitor "<default monitor>"
[  1384.165] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[  1384.165] (==) Automatically adding devices
[  1384.165] (==) Automatically enabling devices
[  1384.165] (==) Not automatically adding GPU devices
[  1384.165] (==) Max clients allowed: 256, resource mask: 0x1fffff
[  1384.165] (==) FontPath set to:
        /usr/X11R6/lib/X11/fonts/misc/,
        /usr/X11R6/lib/X11/fonts/TTF/,
        /usr/X11R6/lib/X11/fonts/OTF/,
        /usr/X11R6/lib/X11/fonts/Type1/,
        /usr/X11R6/lib/X11/fonts/100dpi/,
        /usr/X11R6/lib/X11/fonts/75dpi/
[  1384.165] (==) ModulePath set to "/usr/X11R6/lib/modules"
[  1384.165] (II) The server relies on wscons to provide the list of input 
devices.
        If no devices become available, reconfigure wscons or disable 
AutoAddDevices.
[  1384.165] (II) Loader magic: 0x7c800201000
[  1384.165] (II) Module ABI versions:
[  1384.165]    X.Org ANSI C Emulation: 0.4
[  1384.165]    X.Org Video Driver: 23.0
[  1384.165]    X.Org XInput driver : 24.1
[  1384.165]    X.Org Server Extension : 10.0
[  1384.166] (--) PCI:*(0:0:2:0) 8086:22b1:1462:b120 rev 53, Mem @ 
0x80000000/16777216, 0x90000000/268435456, I/O @ 0x0000f000/64
[  1384.166] (II) LoadModule: "glx"
[  1384.167] (II) Loading /usr/X11R6/lib/modules/extensions/libglx.so
[  1384.174] (II) Module glx: vendor="X.Org Foundation"
[  1384.174]    compiled for 1.19.7, module version = 1.0.0
[  1384.174]    ABI class: X.Org Server Extension, version 10.0
[  1384.174] (==) Matched modesetting as autoconfigured driver 0
[  1384.174] (==) Assigned the driver to the xf86ConfigLayout
[  1384.174] (II) LoadModule: "modesetting"
[  1384.175] (II) Loading /usr/X11R6/lib/modules/drivers/modesetting_drv.so
[  1384.177] (II) Module modesetting: vendor="X.Org Foundation"
[  1384.177]    compiled for 1.19.7, module version = 1.19.7
[  1384.177]    Module class: X.Org Video Driver
[  1384.177]    ABI class: X.Org Video Driver, version 23.0
[  1384.177] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[  1384.189] (**) modeset(0): claimed PCI slot 0@0:2:0
[  1384.189] (II) modeset(0): using default device
[  1384.206] (II) modeset(0): Creating default Display subsection in Screen 
section
        "Default Screen Section" for depth/fbbpp 24/32
[  1384.206] (==) modeset(0): Depth 24, (==) framebuffer bpp 32
[  1384.206] (==) modeset(0): RGB weight 888
[  1384.206] (==) modeset(0): Default visual is TrueColor
[  1384.206] (II) Loading sub module "glamoregl"
[  1384.206] (II) LoadModule: "glamoregl"
[  1384.209] (II) Loading /usr/X11R6/lib/modules/libglamoregl.so
[  1384.230] (II) Module glamoregl: vendor="X.Org Foundation"
[  1384.230]    compiled for 1.19.7, module version = 1.0.0
[  1384.230]    ABI class: X.Org ANSI C Emulation, version 0.4
[  1384.230] (II) glamor: OpenGL accelerated X.org driver based.
[  1384.277] (II) glamor: EGL version 1.4:
[  1384.287] (II) modeset(0): glamor initialized
[  1384.391] (II) modeset(0): Output DP-1 has no monitor section
[  1384.393] (II) modeset(0): Output HDMI-1 has no monitor section
[  1384.497] (II) modeset(0): Output DP-2 has no monitor section
[  1384.677] (II) modeset(0): Output HDMI-2 has no monitor section
[  1384.769] (II) modeset(0): Output DP-3 has no monitor section
[  1384.797] (II) modeset(0): Output HDMI-3 has no monitor section
[  1384.901] (II) modeset(0): EDID for output DP-1
[  1384.904] (II) modeset(0): EDID for output HDMI-1
[  1385.008] (II) modeset(0): EDID for output DP-2
[  1385.187] (II) modeset(0): EDID for output HDMI-2
[  1385.279] (II) modeset(0): EDID for output DP-3
[  1385.307] (II) modeset(0): EDID for output HDMI-3
[  1385.307] (II) modeset(0): Manufacturer: DEL  Model: a0b2  Serial#: 962153811
[  1385.307] (II) modeset(0): Year: 2015  Week: 48
[  1385.307] (II) modeset(0): EDID Version: 1.3
[  1385.308] (II) modeset(0): Digital Display Input
[  1385.308] (II) modeset(0): Max Image Size [cm]: horiz.: 53  vert.: 30
[  1385.308] (II) modeset(0): Gamma: 2.20
[  1385.308] (II) modeset(0): DPMS capabilities: StandBy Suspend Off
[  1385.309] (II) modeset(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4 
[  1385.309] (II) modeset(0): Default color space is primary color space
[  1385.309] (II) modeset(0): First detailed timing is preferred mode
[  1385.309] (II) modeset(0): redX: 0.653 redY: 0.335   greenX: 0.323 greenY: 
0.611
[  1385.309] (II) modeset(0): blueX: 0.153 blueY: 0.062   whiteX: 0.313 whiteY: 
0.329
[  1385.309] (II) modeset(0): Supported established timings:
[  1385.309] (II) modeset(0): 720x400@70Hz
[  1385.309] (II) modeset(0): 640x480@60Hz
[  1385.309] (II) modeset(0): 640x480@75Hz
[  1385.309] (II) modeset(0): 800x600@60Hz
[  1385.309] (II) modeset(0): 800x600@75Hz
[  1385.309] (II) modeset(0): 1024x768@60Hz
[  1385.309] (II) modeset(0): 1024x768@75Hz
[  1385.309] (II) modeset(0): 1280x1024@75Hz
[  1385.309] (II) modeset(0): Manufacturer's mask: 0
[  1385.309] (II) modeset(0): Supported standard timings:
[  1385.309] (II) modeset(0): #0: hsize: 1152  vsize 864  refresh: 75  vid: 
20337
[  1385.309] (II) modeset(0): #1: hsize: 1280  vsize 1024  refresh: 60  vid: 
32897
[  1385.309] (II) modeset(0): #2: hsize: 1600  vsize 900  refresh: 60  vid: 
49321
[  1385.309] (II) modeset(0): #3: hsize: 1600  vsize 1200  refresh: 60  vid: 
16553
[  1385.309] (II) modeset(0): #4: hsize: 1920  vsize 1080  refresh: 60  vid: 
49361
[  1385.309] (II) modeset(0): Supported detailed timing:
[  1385.309] (II) modeset(0): clock: 148.5 MHz   Image Size:  527 x 296 mm
[  1385.309] (II) modeset(0): h_active: 1920  h_sync: 2008  h_sync_end 2052 
h_blank_end 2200 h_border: 0
[  1385.309] (II) modeset(0): v_active: 1080  v_sync: 1084  v_sync_end 1089 
v_blanking: 1125 v_border: 0
[  1385.309] (II) modeset(0): Serial No: H8H7G5BQ9YMS
[  1385.309] (II) modeset(0): Monitor name: DELL U2414H
[  1385.309] (II) modeset(0): Ranges: V min: 56 V max: 76 Hz, H min: 30 H max: 
83 kHz, PixClock max 175 MHz
[  1385.310] (II) modeset(0): Supported detailed timing:
[  1385.310] (II) modeset(0): clock: 148.5 MHz   Image Size:  527 x 296 mm
[  1385.310] (II) modeset(0): h_active: 1920  h_sync: 2008  h_sync_end 2052 
h_blank_end 2200 h_border: 0
[  1385.310] (II) modeset(0): v_active: 1080  v_sync: 1084  v_sync_end 1089 
v_blanking: 1125 v_border: 0
[  1385.310] (II) modeset(0): Supported detailed timing:
[  1385.310] (II) modeset(0): clock: 74.2 MHz   Image Size:  527 x 296 mm
[  1385.310] (II) modeset(0): h_active: 1920  h_sync: 2008  h_sync_end 2052 
h_blank_end 2200 h_border: 0
[  1385.310] (II) modeset(0): v_active: 540  v_sync: 542  v_sync_end 547 
v_blanking: 562 v_border: 0
[  1385.310] (II) modeset(0): Supported detailed timing:
[  1385.310] (II) modeset(0): clock: 74.2 MHz   Image Size:  527 x 296 mm
[  1385.310] (II) modeset(0): h_active: 1280  h_sync: 1390  h_sync_end 1430 
h_blank_end 1650 h_border: 0
[  1385.310] (II) modeset(0): v_active: 720  v_sync: 725  v_sync_end 730 
v_blanking: 750 v_border: 0
[  1385.310] (II) modeset(0): Supported detailed timing:
[  1385.310] (II) modeset(0): clock: 27.0 MHz   Image Size:  527 x 296 mm
[  1385.310] (II) modeset(0): h_active: 720  h_sync: 736  h_sync_end 798 
h_blank_end 858 h_border: 0
[  1385.310] (II) modeset(0): v_active: 480  v_sync: 489  v_sync_end 495 
v_blanking: 525 v_border: 0
[  1385.310] (II) modeset(0): Number of EDID sections to follow: 1
[  1385.310] (II) modeset(0): EDID (in hex):
[  1385.310] (II) modeset(0):   00ffffffffffff0010acb2a0534d5939
[  1385.310] (II) modeset(0):   3019010380351e78ee7e75a755529c27
[  1385.310] (II) modeset(0):   0f5054a54b00714f8180a9c0a940d1c0
[  1385.310] (II) modeset(0):   010101010101023a801871382d40582c
[  1385.310] (II) modeset(0):   45000f282100001e000000ff00483848
[  1385.310] (II) modeset(0):   374735425139594d530a000000fc0044
[  1385.311] (II) modeset(0):   454c4c205532343134480a20000000fd
[  1385.311] (II) modeset(0):   00384c1e5311000a20202020202001e0
[  1385.311] (II) modeset(0):   02031ff14c9005040302071601141f12
[  1385.311] (II) modeset(0):   132309070765030c0020008301000002
[  1385.311] (II) modeset(0):   3a801871382d40582c45000f28210000
[  1385.311] (II) modeset(0):   1e011d8018711c1620582c25000f2821
[  1385.311] (II) modeset(0):   00009e011d007251d01e206e2855000f
[  1385.311] (II) modeset(0):   282100001e8c0ad08a20e02d10103e96
[  1385.311] (II) modeset(0):   000f2821000018000000000000000000
[  1385.311] (II) modeset(0):   00000000000000000000000000000027
[  1385.311] (II) modeset(0): Printing probed modes for output HDMI-3
[  1385.311] (II) modeset(0): Modeline "1920x1080"x60.0  148.50  1920 2008 2052 
2200  1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[  1385.311] (II) modeset(0): Modeline "1920x1080"x50.0  148.50  1920 2448 2492 
2640  1080 1084 1089 1125 +hsync +vsync (56.2 kHz e)
[  1385.311] (II) modeset(0): Modeline "1920x1080"x59.9  148.35  1920 2008 2052 
2200  1080 1084 1089 1125 +hsync +vsync (67.4 kHz e)
[  1385.311] (II) modeset(0): Modeline "1920x1080i"x60.0   74.25  1920 2008 
2052 2200  1080 1084 1094 1125 interlace +hsync +vsync (33.8 kHz e)
[  1385.312] (II) modeset(0): Modeline "1920x1080i"x50.0   74.25  1920 2448 
2492 2640  1080 1084 1094 1125 interlace +hsync +vsync (28.1 kHz e)
[  1385.312] (II) modeset(0): Modeline "1920x1080i"x59.9   74.18  1920 2008 
2052 2200  1080 1084 1094 1125 interlace +hsync +vsync (33.7 kHz e)
[  1385.312] (II) modeset(0): Modeline "1600x1200"x60.0  162.00  1600 1664 1856 
2160  1200 1201 1204 1250 +hsync +vsync (75.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1600x900"x60.0  108.00  1600 1624 1704 
1800  900 901 904 1000 +hsync +vsync (60.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1280x1024"x75.0  135.00  1280 1296 1440 
1688  1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1280x1024"x60.0  108.00  1280 1328 1440 
1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1152x864"x75.0  108.00  1152 1216 1344 
1600  864 865 868 900 +hsync +vsync (67.5 kHz e)
[  1385.312] (II) modeset(0): Modeline "1280x720"x60.0   74.25  1280 1390 1430 
1650  720 725 730 750 +hsync +vsync (45.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1280x720"x50.0   74.25  1280 1720 1760 
1980  720 725 730 750 +hsync +vsync (37.5 kHz e)
[  1385.312] (II) modeset(0): Modeline "1280x720"x59.9   74.18  1280 1390 1430 
1650  720 725 730 750 +hsync +vsync (45.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1024x768"x75.0   78.75  1024 1040 1136 
1312  768 769 772 800 +hsync +vsync (60.0 kHz e)
[  1385.312] (II) modeset(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 
1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[  1385.312] (II) modeset(0): Modeline "800x600"x75.0   49.50  800 816 896 1056 
 600 601 604 625 +hsync +vsync (46.9 kHz e)
[  1385.312] (II) modeset(0): Modeline "800x600"x60.3   40.00  800 840 968 1056 
 600 601 605 628 +hsync +vsync (37.9 kHz e)
[  1385.312] (II) modeset(0): Modeline "720x576"x50.0   27.00  720 732 796 864  
576 581 586 625 -hsync -vsync (31.2 kHz e)
[  1385.312] (II) modeset(0): Modeline "720x576i"x50.0   13.50  720 732 795 864 
 576 580 586 625 interlace -hsync -vsync (15.6 kHz e)
[  1385.312] (II) modeset(0): Modeline "720x480"x60.0   27.03  720 736 798 858  
480 489 495 525 -hsync -vsync (31.5 kHz e)
[  1385.312] (II) modeset(0): Modeline "720x480"x59.9   27.00  720 736 798 858  
480 489 495 525 -hsync -vsync (31.5 kHz e)
[  1385.312] (II) modeset(0): Modeline "720x480i"x60.0   13.51  720 739 801 858 
 480 488 494 525 interlace -hsync -vsync (15.8 kHz e)
[  1385.312] (II) modeset(0): Modeline "720x480i"x59.9   13.50  720 739 801 858 
 480 488 494 525 interlace -hsync -vsync (15.7 kHz e)
[  1385.312] (II) modeset(0): Modeline "640x480"x75.0   31.50  640 656 720 840  
480 481 484 500 -hsync -vsync (37.5 kHz e)
[  1385.312] (II) modeset(0): Modeline "640x480"x60.0   25.20  640 656 752 800  
480 490 492 525 -hsync -vsync (31.5 kHz e)
[  1385.313] (II) modeset(0): Modeline "640x480"x59.9   25.18  640 656 752 800  
480 490 492 525 -hsync -vsync (31.5 kHz e)
[  1385.313] (II) modeset(0): Modeline "720x400"x70.1   28.32  720 738 846 900  
400 412 414 449 -hsync +vsync (31.5 kHz e)
[  1385.313] (II) modeset(0): Output DP-1 disconnected
[  1385.313] (II) modeset(0): Output HDMI-1 disconnected
[  1385.313] (II) modeset(0): Output DP-2 disconnected
[  1385.313] (II) modeset(0): Output HDMI-2 disconnected
[  1385.313] (II) modeset(0): Output DP-3 disconnected
[  1385.313] (II) modeset(0): Output HDMI-3 connected
[  1385.313] (II) modeset(0): Using exact sizes for initial modes
[  1385.313] (II) modeset(0): Output HDMI-3 using initial mode 1920x1080 +0+0
[  1385.313] (==) modeset(0): Using gamma correction (1.0, 1.0, 1.0)
[  1385.313] (==) modeset(0): DPI set to (96, 96)
[  1385.313] (II) Loading sub module "fb"
[  1385.313] (II) LoadModule: "fb"
[  1385.315] (II) Loading /usr/X11R6/lib/modules/libfb.so
[  1385.317] (II) Module fb: vendor="X.Org Foundation"
[  1385.317]    compiled for 1.19.7, module version = 1.0.0
[  1385.318]    ABI class: X.Org ANSI C Emulation, version 0.4
[  1385.318] (==) Depth 24 pixmap format is 32 bpp

/var/log/messages [extract - with the default X config]:
2019-07-20T11:15:31.838Z obscure /bsd: drm:pid38350:i915_reset_engine *NOTICE* 
Resetting bcs0 for hang on bcs0
2019-07-20T11:15:33.830Z obscure /bsd: asynchronous wait on fence 
i915:Xorg[78875]/:1 timed out
2019-07-20T11:15:56.159Z obscure /bsd: drm:pid38350:i915_reset_engine *NOTICE* 
Resetting bcs0 for hang on bcs0
2019-07-20T11:15:56.159Z obscure /bsd: drm:pid38350:i915_reset *NOTICE* 
Resetting chip for hang on bcs0
2019-07-20T11:15:56.160Z obscure /bsd: drm:pid38350:i915_reset *ERROR* Failed 
to reset chip
2019-07-20T11:18:33.154Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T11:18:33.155Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:18:33.155Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:18:33.156Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:18:33.156Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)[drm] *ERROR* timeout setting power well state 00000000 (fcfff3ff)
2019-07-20T11:18:33.157Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:18:33.157Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:18:33.157Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:18:33.158Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)
2019-07-20T11:18:33.670Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T11:18:33.670Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:18:33.671Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:18:33.671Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:18:33.672Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)[drm] *ERROR* timeout setting power well state 00000000 (fcfff3ff)
2019-07-20T11:18:33.672Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:18:33.673Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:18:33.673Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:18:33.673Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)
2019-07-20T11:20:38.018Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T11:20:38.018Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:20:38.198Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:20:38.198Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:20:38.199Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)[drm] *ERROR* timeout setting power well state 00000000 (fcfff3ff)
2019-07-20T11:20:38.199Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:20:38.199Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:20:38.200Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:20:38.200Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)
2019-07-20T11:20:38.422Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T11:20:38.708Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:20:38.708Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:20:38.709Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:20:38.709Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)
2019-07-20T11:20:38.710Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T11:20:38.710Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T11:20:38.710Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T11:20:38.711Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T11:20:38.711Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)

Xorg.log.0 [with X config forcing use of Intel driver]:
[   434.363] (WW) checkDevMem: failed to open /dev/xf86 and /dev/mem
        (Operation not permitted)
        Check that you have set 'machdep.allowaperture=1'
        in /etc/sysctl.conf and reboot your machine
        refer to xf86(4) for details
[   434.364]    linear framebuffer access unavailable
[   434.428] (--) Using wscons driver on /dev/ttyC4
[   434.459] 
X.Org X Server 1.19.7
Release Date: 2019-03-02
[   434.459] X Protocol Version 11, Revision 0
[   434.459] Build Operating System: OpenBSD 6.5 amd64 
[   434.459] Current Operating System: OpenBSD obscure.loc.rlr.id.au 6.5 
GENERIC.MP#131 amd64
[   434.460] Build Date: 19 July 2019  01:47:01PM
[   434.460]  
[   434.460] Current version of pixman: 0.38.4
[   434.460]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[   434.460] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[   434.460] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Jul 20 20:19:38 
2019
[   434.461] (==) Using config directory: "/etc/X11/xorg.conf.d"
[   434.462] (==) Using system config directory 
"/usr/X11R6/share/X11/xorg.conf.d"
[   434.464] (==) No Layout section.  Using the first Screen section.
[   434.464] (==) No screen section available. Using defaults.
[   434.464] (**) |-->Screen "Default Screen Section" (0)
[   434.465] (**) |   |-->Monitor "<default monitor>"
[   434.466] (==) No device specified for screen "Default Screen Section".
        Using the first device section listed.
[   434.466] (**) |   |-->Device "Intel"
[   434.466] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[   434.466] (==) Automatically adding devices
[   434.467] (==) Automatically enabling devices
[   434.467] (==) Not automatically adding GPU devices
[   434.467] (==) Max clients allowed: 256, resource mask: 0x1fffff
[   434.468] (==) FontPath set to:
        /usr/X11R6/lib/X11/fonts/misc/,
        /usr/X11R6/lib/X11/fonts/TTF/,
        /usr/X11R6/lib/X11/fonts/OTF/,
        /usr/X11R6/lib/X11/fonts/Type1/,
        /usr/X11R6/lib/X11/fonts/100dpi/,
        /usr/X11R6/lib/X11/fonts/75dpi/
[   434.468] (==) ModulePath set to "/usr/X11R6/lib/modules"
[   434.468] (II) The server relies on wscons to provide the list of input 
devices.
        If no devices become available, reconfigure wscons or disable 
AutoAddDevices.
[   434.468] (II) Loader magic: 0x2f5eb584000
[   434.468] (II) Module ABI versions:
[   434.468]    X.Org ANSI C Emulation: 0.4
[   434.468]    X.Org Video Driver: 23.0
[   434.468]    X.Org XInput driver : 24.1
[   434.468]    X.Org Server Extension : 10.0
[   434.469] (--) PCI:*(0:0:2:0) 8086:22b1:1462:b120 rev 53, Mem @ 
0x80000000/16777216, 0x90000000/268435456, I/O @ 0x0000f000/64
[   434.469] (II) LoadModule: "glx"
[   434.471] (II) Loading /usr/X11R6/lib/modules/extensions/libglx.so
[   434.495] (II) Module glx: vendor="X.Org Foundation"
[   434.495]    compiled for 1.19.7, module version = 1.0.0
[   434.495]    ABI class: X.Org Server Extension, version 10.0
[   434.496] (II) LoadModule: "intel"
[   434.496] (II) Loading /usr/X11R6/lib/modules/drivers/intel_drv.so
[   434.502] (II) Module intel: vendor="X.Org Foundation"
[   434.503]    compiled for 1.19.7, module version = 2.99.916
[   434.503]    Module class: X.Org Video Driver
[   434.503]    ABI class: X.Org Video Driver, version 23.0
[   434.503] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
        i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
        915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
        Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
        GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
[   434.504] (II) intel: Driver for Intel(R) HD Graphics: 2000-6000
[   434.504] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100, 6100
[   434.504] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200, 6200, 
P6300
[   434.550] (II) intel(0): Using Kernel Mode Setting driver: i915, version 
1.6.0 20180719
[   434.553] (--) intel(0): gen8 engineering sample
[   434.553] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2
[   434.553] (II) intel(0): Creating default Display subsection in Screen 
section
        "Default Screen Section" for depth/fbbpp 24/32
[   434.553] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[   434.553] (==) intel(0): RGB weight 888
[   434.554] (==) intel(0): Default visual is TrueColor
[   434.557] (II) intel(0): Output DP1 has no monitor section
[   434.557] (II) intel(0): Enabled output DP1
[   434.557] (II) intel(0): Output HDMI1 has no monitor section
[   434.557] (II) intel(0): Enabled output HDMI1
[   434.557] (II) intel(0): Output DP2 has no monitor section
[   434.557] (II) intel(0): Enabled output DP2
[   434.557] (II) intel(0): Output HDMI2 has no monitor section
[   434.557] (II) intel(0): Enabled output HDMI2
[   434.557] (II) intel(0): Output DP3 has no monitor section
[   434.557] (II) intel(0): Enabled output DP3
[   434.558] (II) intel(0): Output HDMI3 has no monitor section
[   434.558] (II) intel(0): Enabled output HDMI3
[   434.558] (--) intel(0): Using a maximum size of 256x256 for hardware cursors
[   434.558] (II) intel(0): Output VIRTUAL1 has no monitor section
[   434.558] (II) intel(0): Enabled output VIRTUAL1
[   434.558] (--) intel(0): Output HDMI3 using initial mode 1920x1080 on pipe 2
[   434.559] (==) intel(0): TearFree disabled
[   434.559] (==) intel(0): Using gamma correction (1.0, 1.0, 1.0)
[   434.559] (==) intel(0): DPI set to (96, 96)
[   434.559] (II) Loading sub module "dri3"
[   434.559] (II) LoadModule: "dri3"
[   434.559] (II) Module "dri3" already built-in
[   434.559] (II) Loading sub module "dri2"
[   434.559] (II) LoadModule: "dri2"
[   434.559] (II) Module "dri2" already built-in
[   434.559] (II) Loading sub module "present"
[   434.559] (II) LoadModule: "present"
[   434.559] (II) Module "present" already built-in
[   434.559] (==) Depth 24 pixmap format is 32 bpp
[   434.564] (II) intel(0): SNA initialized with Broadwell backend
[   434.565] (==) intel(0): Backing store enabled
[   434.565] (==) intel(0): Silken mouse enabled
[   434.566] (II) intel(0): HW Cursor enabled
[   434.566] (II) intel(0): RandR 1.2 enabled, ignore the following RandR 
disabled message.
[   434.569] (==) intel(0): DPMS enabled
[   434.570] (II) intel(0): [DRI2] Setup complete
[   434.570] (II) intel(0): [DRI2]   DRI driver: i965
[   434.570] (II) intel(0): [DRI2]   VDPAU driver: i965
[   434.571] (II) intel(0): direct rendering: DRI2 DRI3 enabled
[   434.571] (II) intel(0): hardware support for Present enabled
[   434.571] (--) RandR disabled
[   434.674] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[   434.674] (II) AIGLX: enabled GLX_ARB_create_context
[   434.674] (II) AIGLX: enabled GLX_ARB_create_context_profile
[   434.674] (II) AIGLX: enabled GLX_EXT_create_context_es{,2}_profile
[   434.674] (II) AIGLX: enabled GLX_INTEL_swap_event
[   434.674] (II) AIGLX: enabled GLX_SGI_swap_control
[   434.674] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
[   434.674] (II) AIGLX: enabled GLX_ARB_fbconfig_float
[   434.674] (II) AIGLX: enabled GLX_EXT_fbconfig_packed_float
[   434.674] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
[   434.674] (II) AIGLX: enabled GLX_ARB_create_context_robustness
[   434.676] (II) AIGLX: Loaded and initialized i965
[   434.676] (II) GLX: Initialized DRI2 GL provider for screen 0
[   434.688] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI3 using pipe 
2, position (0, 0), rotation normal, reflection none
[   443.076] (II) intel(0): Setting screen physical size to 508 x 285
[   444.270] (II) config/wscons: checking input device /dev/wskbd
[   444.271] (II) wskbd: using layout us
[   444.271] (II) LoadModule: "kbd"
[   444.279] (II) Loading /usr/X11R6/lib/modules/input/kbd_drv.so
[   444.283] (II) Module kbd: vendor="X.Org Foundation"
[   444.283]    compiled for 1.19.7, module version = 1.9.0
[   444.283]    Module class: X.Org XInput Driver
[   444.283]    ABI class: X.Org XInput driver, version 24.1
[   444.283] (II) Using input driver 'kbd' for '/dev/wskbd'
[   444.283] (**) /dev/wskbd: always reports core events
[   444.284] (**) /dev/wskbd: always reports core events
[   444.284] (**) Option "Protocol" "standard"
[   444.285] (**) Option "XkbRules" "base"
[   444.285] (**) Option "XkbModel" "pc105"
[   444.285] (**) Option "XkbLayout" "us"
[   444.285] (II) XINPUT: Adding extended input device "/dev/wskbd" (type: 
KEYBOARD, id 6)
[   444.664] (II) config/wscons: checking input device /dev/wsmouse
[   444.664] (II) LoadModule: "ws"
[   444.674] (II) Loading /usr/X11R6/lib/modules/input/ws_drv.so
[   444.678] (II) Module ws: vendor="X.Org Foundation"
[   444.678]    compiled for 1.19.7, module version = 1.3.0
[   444.678]    Module class: X.Org XInput Driver
[   444.678]    ABI class: X.Org XInput driver, version 24.1
[   444.679] (II) Using input driver 'ws' for '/dev/wsmouse'
[   444.679] (**) /dev/wsmouse: always reports core events
[   444.679] (II) ws: /dev/wsmouse: debuglevel 0
[   444.680] (**) Option "Device" "/dev/wsmouse"
[   444.680] (**) ws: /dev/wsmouse: ZAxisMapping: buttons 4 and 5
[   444.680] (**) ws: /dev/wsmouse: WAxisMapping: buttons 6 and 7
[   444.680] (**) ws: /dev/wsmouse: associated screen: 0
[   444.682] (II) ws: /dev/wsmouse: minimum x position: 0
[   444.682] (II) ws: /dev/wsmouse: maximum x position: 1919
[   444.682] (II) ws: /dev/wsmouse: minimum y position: 0
[   444.682] (II) ws: /dev/wsmouse: maximum y position: 1079
[   444.682] (==) ws: /dev/wsmouse: Buttons: 7
[   444.686] (**) ws: /dev/wsmouse: YAxisMapping: buttons 4 and 5
[   444.686] (II) XINPUT: Adding extended input device "/dev/wsmouse" (type: 
MOUSE, id 7)
[   444.690] (**) /dev/wsmouse: (accel) keeping acceleration scheme 1
[   444.690] (**) /dev/wsmouse: (accel) acceleration profile 0
[   444.691] (**) /dev/wsmouse: (accel) acceleration factor: 2.000
[   444.691] (**) /dev/wsmouse: (accel) acceleration threshold: 4
[   444.710] (EE) intel(0): Detected a hung GPU, disabling acceleration.
[   466.207] (II) intel(0): EDID vendor "DEL", prod id 41138
[   466.208] (II) intel(0): Using EDID range info for horizontal sync
[   466.208] (II) intel(0): Using EDID range info for vertical refresh
[   466.208] (II) intel(0): Printing DDC gathered Modelines:
[   466.208] (II) intel(0): Modeline "1920x1080"x0.0  148.50  1920 2008 2052 
2200  1080 1084 1089 1125 +hsync +vsync (67.5 kHz eP)
[   466.208] (II) intel(0): Modeline "1920x1080i"x0.0   74.25  1920 2008 2052 
2200  1080 1084 1094 1125 interlace +hsync +vsync (33.8 kHz e)
[   466.208] (II) intel(0): Modeline "1280x720"x0.0   74.25  1280 1390 1430 
1650  720 725 730 750 +hsync +vsync (45.0 kHz e)
[   466.208] (II) intel(0): Modeline "720x480"x0.0   27.00  720 736 798 858  
480 489 495 525 -hsync -vsync (31.5 kHz e)
[   466.208] (II) intel(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  
600 601 605 628 +hsync +vsync (37.9 kHz e)
[   466.208] (II) intel(0): Modeline "640x480"x0.0   31.50  640 656 720 840  
480 481 484 500 -hsync -vsync (37.5 kHz e)
[   466.208] (II) intel(0): Modeline "640x480"x0.0   25.18  640 656 752 800  
480 490 492 525 -hsync -vsync (31.5 kHz e)
[   466.208] (II) intel(0): Modeline "720x400"x0.0   28.32  720 738 846 900  
400 412 414 449 -hsync +vsync (31.5 kHz e)
[   466.208] (II) intel(0): Modeline "1280x1024"x0.0  135.00  1280 1296 1440 
1688  1024 1025 1028 1066 +hsync +vsync (80.0 kHz e)
[   466.208] (II) intel(0): Modeline "1024x768"x0.0   78.75  1024 1040 1136 
1312  768 769 772 800 +hsync +vsync (60.0 kHz e)
[   466.208] (II) intel(0): Modeline "1024x768"x0.0   65.00  1024 1048 1184 
1344  768 771 777 806 -hsync -vsync (48.4 kHz e)
[   466.208] (II) intel(0): Modeline "800x600"x0.0   49.50  800 816 896 1056  
600 601 604 625 +hsync +vsync (46.9 kHz e)
[   466.208] (II) intel(0): Modeline "1152x864"x0.0  108.00  1152 1216 1344 
1600  864 865 868 900 +hsync +vsync (67.5 kHz e)
[   466.208] (II) intel(0): Modeline "1280x1024"x0.0  108.00  1280 1328 1440 
1688  1024 1025 1028 1066 +hsync +vsync (64.0 kHz e)
[   466.208] (II) intel(0): Modeline "1600x900"x60.0  119.00  1600 1696 1864 
2128  900 901 904 932 -hsync +vsync (55.9 kHz e)
[   466.208] (II) intel(0): Modeline "1600x1200"x0.0  162.00  1600 1664 1856 
2160  1200 1201 1204 1250 +hsync +vsync (75.0 kHz e)
[   466.209] (II) intel(0): Modeline "1920x1080"x60.0  172.80  1920 2040 2248 
2576  1080 1081 1084 1118 -hsync +vsync (67.1 kHz e)
[   466.209] (II) intel(0): Modeline "1440x480i"x0.0   27.00  1440 1478 1602 
1716  480 488 494 525 interlace -hsync -vsync (15.7 kHz e)
[   466.209] (II) intel(0): Modeline "1440x576i"x0.0   27.00  1440 1464 1590 
1728  576 580 586 625 interlace -hsync -vsync (15.6 kHz e)
[   466.209] (II) intel(0): Modeline "1920x1080i"x0.0   74.25  1920 2448 2492 
2640  1080 1084 1094 1125 interlace +hsync +vsync (28.1 kHz e)
[   466.209] (II) intel(0): Modeline "1920x1080"x0.0  148.50  1920 2448 2492 
2640  1080 1084 1089 1125 +hsync +vsync (56.2 kHz e)
[   466.209] (II) intel(0): Modeline "720x576"x0.0   27.00  720 732 796 864  
576 581 586 625 -hsync -vsync (31.2 kHz e)
[   466.209] (II) intel(0): Modeline "1280x720"x0.0   74.25  1280 1720 1760 
1980  720 725 730 750 +hsync +vsync (37.5 kHz e)
[   936.865] (II) AIGLX: Suspending AIGLX clients for VT switch

/var/log/messages [extract - with forced use of Intel driver]:
2019-07-20T10:19:47.590Z obscure /bsd: drm:pid857:i915_reset_engine *NOTICE* 
Resetting bcs0 for hang on bcs0
2019-07-20T10:19:47.591Z obscure /bsd: drm:pid857:i915_reset *NOTICE* Resetting 
chip for hang on bcs0
2019-07-20T10:19:47.591Z obscure /bsd: drm:pid857:i915_reset *ERROR* Failed to 
reset chip
2019-07-20T10:20:10.435Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T10:20:10.436Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T10:20:10.436Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T10:20:10.437Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T10:20:10.437Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)[drm] *ERROR* timeout setting power well state 00000000 (fcfff3ff)
2019-07-20T10:20:10.437Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T10:20:10.438Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T10:20:10.438Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T10:20:10.439Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)
2019-07-20T10:20:10.953Z obscure /bsd: [drm] *ERROR* timeout setting power well 
state 00000000 (fcfff3ff)
2019-07-20T10:20:10.954Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T10:20:10.954Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T10:20:10.955Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T10:20:10.955Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)[drm] *ERROR* timeout setting power well state 00000000 (fcfff3ff)
2019-07-20T10:20:10.956Z obscure /bsd: [drm] *ERROR* Display PHY 0 is not power 
up
2019-07-20T10:20:10.956Z obscure /bsd: DPIO read pipe A reg 0x8170 == 0xffffffff
2019-07-20T10:20:10.956Z obscure /bsd: DPIO read pipe A reg 0x8098 == 0xffffffff
2019-07-20T10:20:10.957Z obscure /bsd: WARN_ON(ctrl != state)WARN_ON(ctrl != 
state)

glxinfo -B ouput [with forced use of Intel driver]:
i965: Failed to submit batchbuffer: Input/output error
name of display: :0

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