Hi all,

with the help of Chris i finally got it working and i'm happily writing this 
email from X!  I broke it down to these two settings one has to change in the 
UEFI:

* Disable c-states and enable legacy BIOS:

  - Advanced -> CPU Configuration -> CPU C States Support => Disable
  - Boot -> CSM => Enable

Also, i had to connect my monitor with VGA, with DVI the screen goes black when 
the graphics card gets initialized (did not try HDMI).

I'm a bit confused about the xrandr output, there's no VGA and no DVI, but eDP 
and DP, and also two HDMI connectors shown, even though the board only has one. 
 Could this be firmware—related?  Anyway, it works:

$ xrandr -q
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
eDP-1 connected primary 1680x1050+0+0 (normal left inverted right x axis y 
axis) 474mm x 296mm
   1680x1050     59.88*+
   1400x1050     59.98
   1280x1024     75.02    60.02
   1280x960      60.00
   1152x864      75.00
   1024x768      60.04    75.08    75.03    70.07    60.00
   960x720       60.00
   928x696       75.00    60.05
   896x672       75.05    60.01
   832x624       74.55
   800x600       75.00    70.00    65.00    60.00    72.19    75.00    60.32    
56.25
   700x525       74.76    59.98
   640x512       75.02    60.02
   640x480       60.00    75.00    72.81    72.81    75.00    66.67    60.00    
59.94
   720x400       70.08
   576x432       75.00
   512x384       75.03    70.07    60.00
   416x312       74.66
   400x300       72.19    75.12    60.32    56.34
   320x240       72.81    75.00    60.05
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

Here's an excerpt from dmesg for drm (full dmesg attached):

$ dmesg | grep -i drm
inteldrm0 at pci0 dev 2 function 0 vendor "Intel", unknown product 0x5a85 rev 
0x0b
drm0 at inteldrm0
inteldrm0: msi
error: [drm:pid0:i915_firmware_load_error_print] *ERROR* failed to load 
firmware i915/bxt_dmc_ver1.bin (-22)
error: [drm:pid0:i915_gem_init_hw] *ERROR* Failed to initialize GuC, error -8 
(ignored)
inteldrm0: 1680x1050, 32bpp
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
error: [drm:pid51995:intel_pipe_update_start] *ERROR* Potential atomic update 
failure on pipe A


I can quit from cwm to console and restart X as much as i like, it does not 
crash X.

Thanks to all of you who replied and especially to Chris for his time!

Nils
OpenBSD 6.2-current (GENERIC.MP) #379: Sat Jan 20 14:30:55 MST 2018
    dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP
real mem = 8209772544 (7829MB)
avail mem = 7954006016 (7585MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 3.0 @ 0xed450 (18 entries)
bios0: vendor American Megatrends Inc. version "P1.40" date 07/14/2017
bios0: ASRock J3455-ITX
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP FPDT FIDT MCFG DBG2 DBGP HPET LPIT APIC NPKT PRAM WSMT 
SSDT SSDT AAFT SSDT SSDT SSDT SSDT SSDT UEFI WDAT NHLT
acpi0: wakeup devices SIO1(S3) UAR1(S4) HDAS(S3) XHC_(S4) XDCI(S4) BRCM(S0) 
PXSX(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) 
PXSX(S4) RP05(S4) [...]
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-255
acpihpet0 at acpi0: 19200000 Hz
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Celeron(R) CPU J3455 @ 1.50GHz, 1497.14 MHz
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,SDBG,CX16,xTPR,PDCM,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,FSGSBASE,SMEP,ERMS,MPX,RDSEED,SMAP,CLFLUSHOPT,PT,SHA,SENSOR,ARAT
cpu0: 1MB 64b/line 16-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 10 var ranges, 88 fixed ranges
cpu0: apic clock running at 19MHz
cpu0: mwait min=64, max=64, C-substates=0.2.0.2.4.2.1.1, IBE
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Celeron(R) CPU J3455 @ 1.50GHz, 1496.55 MHz
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,SDBG,CX16,xTPR,PDCM,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,FSGSBASE,SMEP,ERMS,MPX,RDSEED,SMAP,CLFLUSHOPT,PT,SHA,SENSOR,ARAT
cpu1: 1MB 64b/line 16-way L2 cache
cpu1: smt 0, core 1, package 0
cpu2 at mainbus0: apid 4 (application processor)
cpu2: Intel(R) Celeron(R) CPU J3455 @ 1.50GHz, 1496.55 MHz
cpu2: 
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,SDBG,CX16,xTPR,PDCM,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,FSGSBASE,SMEP,ERMS,MPX,RDSEED,SMAP,CLFLUSHOPT,PT,SHA,SENSOR,ARAT
cpu2: 1MB 64b/line 16-way L2 cache
cpu2: smt 0, core 2, package 0
cpu3 at mainbus0: apid 6 (application processor)
cpu3: Intel(R) Celeron(R) CPU J3455 @ 1.50GHz, 1496.55 MHz
cpu3: 
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,SDBG,CX16,xTPR,PDCM,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,DEADLINE,AES,XSAVE,RDRAND,NXE,PAGE1GB,RDTSCP,LONG,LAHF,3DNOWP,PERF,ITSC,FSGSBASE,SMEP,ERMS,MPX,RDSEED,SMAP,CLFLUSHOPT,PT,SHA,SENSOR,ARAT
cpu3: 1MB 64b/line 16-way L2 cache
cpu3: smt 0, core 3, package 0
ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 120 pins
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 1 (RP03)
acpiprt2 at acpi0: bus 2 (RP04)
acpiprt3 at acpi0: bus 3 (RP05)
acpiprt4 at acpi0: bus 4 (RP06)
acpiec0 at acpi0: not present
acpicpu0 at acpi0: C1(@1 halt!), PSS
acpicpu1 at acpi0: C1(@1 halt!), PSS
acpicpu2 at acpi0: C1(@1 halt!), PSS
acpicpu3 at acpi0: C1(@1 halt!), PSS
acpipwrres0 at acpi0: FN00, resource for FAN0
acpitz0 at acpi0: critical temperature is 100 degC
acpibtn0 at acpi0: PWRB
"INT3452" at acpi0 not configured
"INT3452" at acpi0 not configured
"INT3452" at acpi0 not configured
"INT3452" at acpi0 not configured
"INT33A1" at acpi0 not configured
"PNP0C0B" at acpi0 not configured
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD1F
cpu0: Enhanced SpeedStep 1497 MHz: speeds: 1501, 1500, 1400, 1300, 1200, 1100, 
1000, 900, 800 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 vendor "Intel", unknown product 0x5af0 rev 0x0b
inteldrm0 at pci0 dev 2 function 0 vendor "Intel", unknown product 0x5a85 rev 
0x0b
drm0 at inteldrm0
inteldrm0: msi
error: [drm:pid0:i915_firmware_load_error_print] *ERROR* failed to load 
firmware i915/bxt_dmc_ver1.bin (-22)
error: [drm:pid0:i915_gem_init_hw] *ERROR* Failed to initialize GuC, error -8 
(ignored)
inteldrm0: 1680x1050, 32bpp
Unclaimed register detected after writing to register 0x68970
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
azalia0 at pci0 dev 14 function 0 vendor "Intel", unknown product 0x5a98 rev 
0x0b: msi
azalia0: codecs: Realtek/0x0892, 0x0000/0x0000, using Realtek/0x0892
audio0 at azalia0
vendor "Intel", unknown product 0x5a9a (class communications subclass 
miscellaneous, rev 0x0b) at pci0 dev 15 function 0 not configured
ahci0 at pci0 dev 18 function 0 vendor "Intel", unknown product 0x5ae3 rev 
0x0b: msi, AHCI 1.3.1
ahci0: port 0: 6.0Gb/s
ahci0: port 1: 1.5Gb/s
scsibus1 at ahci0: 32 targets
sd0 at scsibus1 targ 0 lun 0: <ATA, SAMSUNG SSD 830, CXM0> SCSI3 0/direct fixed 
naa.5002538043584d30
sd0: 244198MB, 512 bytes/sector, 500118192 sectors, thin
cd0 at scsibus1 targ 1 lun 0: <Optiarc, DVD RW AD-7260S, 1.03> ATAPI 5/cdrom 
removable
ppb0 at pci0 dev 19 function 0 vendor "Intel", unknown product 0x5ad8 rev 0xfb: 
msi
pci1 at ppb0 bus 1
re0 at pci1 dev 0 function 0 "Realtek 8168" rev 0x11: RTL8168G/8111G (0x4c00), 
msi, address 70:85:c2:4d:b3:8f
rgephy0 at re0 phy 7: RTL8251 PHY, rev. 0
ppb1 at pci0 dev 19 function 1 vendor "Intel", unknown product 0x5ad9 rev 0xfb: 
msi
pci2 at ppb1 bus 2
ppb2 at pci0 dev 19 function 2 vendor "Intel", unknown product 0x5ada rev 0xfb: 
msi
pci3 at ppb2 bus 3
ahci1 at pci3 dev 0 function 0 "ASMedia ASM1061 AHCI" rev 0x02: msi, AHCI 1.2
ahci1: port 0: 3.0Gb/s
ahci1: port 1: 3.0Gb/s
scsibus2 at ahci1: 32 targets
sd1 at scsibus2 targ 0 lun 0: <ATA, WDC WD20EURS-63S, 51.0> SCSI3 0/direct 
fixed naa.50014ee25c36df7d
sd1: 1907729MB, 512 bytes/sector, 3907029168 sectors
sd2 at scsibus2 targ 1 lun 0: <ATA, WDC WD10EADS-19M, 01.0> SCSI3 0/direct 
fixed naa.50014ee25a2d138a
sd2: 953869MB, 512 bytes/sector, 1953525168 sectors
ppb3 at pci0 dev 19 function 3 vendor "Intel", unknown product 0x5adb rev 0xfb: 
msi
pci4 at ppb3 bus 4
xhci0 at pci0 dev 21 function 0 vendor "Intel", unknown product 0x5aa8 rev 
0x0b: msi
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
pcib0 at pci0 dev 31 function 0 vendor "Intel", unknown product 0x5ae8 rev 0x0b
vendor "Intel", unknown product 0x5ad4 (class serial bus subclass SMBus, rev 
0x0b) at pci0 dev 31 function 1 not configured
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
vmm0 at mainbus0: VMX/EPT
umass0 at uhub0 port 2 configuration 1 interface 0 "Generic Mass Storage 
Device" rev 2.00/1.00 addr 2
umass0: using SCSI over Bulk-Only
scsibus3 at umass0: 2 targets, initiator 0
sd3 at scsibus3 targ 1 lun 0: <Generic-, SD/MMC, 1.00> SCSI0 0/direct removable
sd4 at scsibus3 targ 1 lun 1: <Generic-, Compact Flash, 1.01> SCSI0 0/direct 
removable
sd5 at scsibus3 targ 1 lun 2: <Generic-, SM/xD-Picture, 1.02> SCSI0 0/direct 
removable
sd6 at scsibus3 targ 1 lun 3: <Generic-, MS/MS-Pro, 1.03> SCSI0 0/direct 
removable
uhidev0 at uhub0 port 5 configuration 1 interface 0 "Elan product 0x0103" rev 
1.10/1.07 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub0 port 5 configuration 1 interface 1 "Elan product 0x0103" rev 
1.10/1.07 addr 3
uhidev1: iclass 3/0, 2 report ids
uhid0 at uhidev1 reportid 1: input=2, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
uhidev2 at uhub0 port 6 configuration 1 interface 0 "Logitech USB-PS/2 Optical 
Mouse" rev 2.00/21.00 addr 4
uhidev2: iclass 3/1
ums0 at uhidev2: 8 buttons, Z dir
wsmouse0 at ums0 mux 0
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (6de79c244a03d47a.a) swap on sd0b dump on sd0b
cpu_ucode_intel_apply: microcode updated cpu 0 rev 0x1e->0x2c (3252017)
cpu_ucode_intel_apply: microcode updated cpu 2 rev 0x1e->0x2c (3252017)
error: [drm:pid51995:intel_pipe_update_start] *ERROR* Potential atomic update 
failure on pipe A

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