I got this with VESA driver enabled:
[ 1011.000] (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
[ 1011.000] linear framebuffer access unavailable
[ 1011.008] (--) Using wscons driver on /dev/ttyC4 in pcvt compatibility
mode (version 3.32)
[ 1011.021]
X.Org X Server 1.16.4
Release Date: 2014-12-20
[ 1011.021] X Protocol Version 11, Revision 0
[ 1011.021] Build Operating System: OpenBSD 5.7 amd64
[ 1011.021] Current Operating System: OpenBSD usf.my.domain 5.7
GENERIC.MP#858 amd64
[ 1011.022] Build Date: 20 February 2015 06:16:24AM
[ 1011.022]
[ 1011.022] Current version of pixman: 0.32.6
[ 1011.022] Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
[ 1011.022] Markers: (--) probed, (**) from config file, (==) default
setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 1011.022] (==) Log file: "/var/log/Xorg.0.log", Time: Tue Feb 24
05:14:41 2015
[ 1011.022] (==) Using config file: "/etc/X11/xorg.conf"
[ 1011.022] (==) Using system config directory
"/usr/X11R6/share/X11/xorg.conf.d"
[ 1011.022] (==) ServerLayout "X.org Configured"
[ 1011.022] (**) |-->Screen "Screen0" (0)
[ 1011.022] (**) | |-->Monitor "Monitor0"
[ 1011.022] (**) | |-->Device "Card0"
[ 1011.022] (**) |-->Input Device "Mouse0"
[ 1011.022] (**) |-->Input Device "Keyboard0"
[ 1011.022] (==) Disabling SIGIO handlers for input devices
[ 1011.022] (==) Automatically adding devices
[ 1011.022] (==) Automatically enabling devices
[ 1011.022] (==) Not automatically adding GPU devices
[ 1011.022] (**) 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/,
/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/
[ 1011.022] (**) ModulePath set to "/usr/X11R6/lib/modules"
[ 1011.022] (WW) Hotplugging is on, devices using drivers 'kbd', 'mouse'
or 'vmmouse' will be disabled.
[ 1011.022] (WW) Disabling Mouse0
[ 1011.022] (WW) Disabling Keyboard0
[ 1011.022] (II) Loader magic: 0x10928860b6e0
[ 1011.022] (II) Module ABI versions:
[ 1011.022] X.Org ANSI C Emulation: 0.4
[ 1011.022] X.Org Video Driver: 18.0
[ 1011.022] X.Org XInput driver : 21.0
[ 1011.022] X.Org Server Extension : 8.0
[ 1011.022] (--) PCI:*(0:1:0:0) 10de:0fc6:1043:8427 rev 161, Mem @
0xf6000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @
0x0000e000/128
[ 1011.022] (II) "glx" will be loaded. This was enabled by default and
also specified in the config file.
[ 1011.022] (II) LoadModule: "glx"
[ 1011.023] (II) Loading /usr/X11R6/lib/modules/extensions/libglx.so
[ 1011.028] (II) Module glx: vendor="X.Org Foundation"
[ 1011.028] compiled for 1.16.4, module version = 1.0.0
[ 1011.028] ABI class: X.Org Server Extension, version 8.0
[ 1011.028] (==) AIGLX enabled
[ 1011.028] (II) LoadModule: "vesa"
[ 1011.028] (II) Loading /usr/X11R6/lib/modules/drivers/vesa_drv.so
[ 1011.028] (II) Module vesa: vendor="X.Org Foundation"
[ 1011.028] compiled for 1.16.4, module version = 2.3.3
[ 1011.028] Module class: X.Org Video Driver
[ 1011.028] ABI class: X.Org Video Driver, version 18.0
[ 1011.028] (II) VESA: driver for VESA chipsets: vesa
[ 1011.028] (II) Loading sub module "vbe"
[ 1011.028] (II) LoadModule: "vbe"
[ 1011.029] (II) Loading /usr/X11R6/lib/modules/libvbe.so
[ 1011.029] (II) Module vbe: vendor="X.Org Foundation"
[ 1011.029] compiled for 1.16.4, module version = 1.1.0
[ 1011.029] ABI class: X.Org Video Driver, version 18.0
[ 1011.029] (II) Loading sub module "int10"
[ 1011.029] (II) LoadModule: "int10"
[ 1011.029] (II) Loading /usr/X11R6/lib/modules/libint10.so
[ 1011.029] (II) Module int10: vendor="X.Org Foundation"
[ 1011.029] compiled for 1.16.4, module version = 1.0.0
[ 1011.029] ABI class: X.Org Video Driver, version 18.0
[ 1011.029] (II) VESA(0): initializing int10
[ 1011.029] (EE) VESA(0): Cannot read int vect
[ 1011.029] (II) UnloadModule: "vesa"
[ 1011.029] (II) UnloadSubModule: "int10"
[ 1011.029] (II) Unloading int10
[ 1011.029] (II) UnloadSubModule: "vbe"
[ 1011.029] (II) Unloading vbe
[ 1011.029] (EE) Screen(s) found, but none have a usable configuration.
[ 1011.029] (EE)
Fatal server error:
[ 1011.029] (EE) no screens found(EE)
[ 1011.030] (EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 1011.030] (EE) Please also check the log file at "/var/log/Xorg.0.log"
for additional information.
[ 1011.030] (EE)
[ 1011.040] (EE) Server terminated with error (1). Closing log file.
>[ 1011.029] (EE) VESA(0): Cannot read int vect
Googled, but nothing helpful :(
