#cat /var/log/Xorg.0.log
[    76.228]
X.Org X Server 1.17.4
Release Date: 2015-10-28
[    76.228] X Protocol Version 11, Revision 0
[    76.228] Build Operating System: Linux 4.1.15-gentoo-r1 x86_64 Gentoo
[    76.228] Current Operating System: Linux rontoo 4.1.15-amdgpu #10 SMP Sun Apr 17 22:53:06 MSK 2016 x86_64
[    76.228] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.1.15-amdgpu root=/dev/sdb3
[    76.228] Build Date: 21 February 2016  12:20:13PM
[    76.228]
[    76.228] Current version of pixman: 0.32.8
[    76.228]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[    76.228] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    76.228] (==) Log file: "/var/log/Xorg.0.log", Time: Mon Apr 18 09:49:41 2016
[    76.286] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    76.286] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    76.322] (==) No Layout section.  Using the first Screen section.
[    76.322] (**) |-->Screen "Screen0" (0)
[    76.322] (**) |   |-->Monitor "<default monitor>"
[    76.322] (==) No device specified for screen "Screen0".
        Using the first device section listed.
[    76.322] (**) |   |-->Device "Amdgpu"
[    76.322] (==) No monitor specified for screen "Screen0".
        Using a default monitor configuration.
[    76.322] (==) Automatically adding devices
[    76.322] (==) Automatically enabling devices
[    76.322] (==) Automatically adding GPU devices
[    76.387] (==) FontPath set to:
        /usr/share/fonts/misc/,
        /usr/share/fonts/TTF/,
        /usr/share/fonts/OTF/,
        /usr/share/fonts/Type1/,
        /usr/share/fonts/100dpi/,
        /usr/share/fonts/75dpi/
[    76.387] (==) ModulePath set to "/usr/lib64/xorg/modules"
[    76.387] (II) The server relies on udev to provide the list of input devices.
        If no devices become available, reconfigure udev or disable AutoAddDevices.
[    76.387] (II) Loader magic: 0x802c40
[    76.387] (II) Module ABI versions:
[    76.387]    X.Org ANSI C Emulation: 0.4
[    76.387]    X.Org Video Driver: 19.0
[    76.387]    X.Org XInput driver : 21.0
[    76.387]    X.Org Server Extension : 9.0
[    76.388] (--) PCI:*(0:1:0:0) 1002:6939:1462:2015 rev 241, Mem @ 0xe0000000/268435456, 0xf0000000/2097152, 0xf7e00000/262144, I/O @ 0x0000e000/256, BIOS @ 0x????????/131072
[    76.389] (II) "glx" will be loaded by default.
[    76.389] (II) LoadModule: "modesetting"
[    76.422] (II) Loading /usr/lib64/xorg/modules/drivers/modesetting_drv.so
[    76.430] (II) Module modesetting: vendor="X.Org Foundation"
[    76.430]    compiled for 1.17.4, module version = 1.17.4
[    76.430]    Module class: X.Org Video Driver
[    76.430]    ABI class: X.Org Video Driver, version 19.0
[    76.430] (II) LoadModule: "glx"
[    76.434] (II) Loading /usr/lib64/xorg/modules/extensions/libglx.so
[    76.584] (II) Module glx: vendor="X.Org Foundation"
[    76.584]    compiled for 1.17.4, module version = 1.0.0
[    76.584]    ABI class: X.Org Server Extension, version 9.0
[    76.584] (==) AIGLX enabled
[    76.584] (II) LoadModule: "amdgpu"
[    76.585] (II) Loading /usr/lib64/xorg/modules/drivers/amdgpu_drv.so
[    76.621] (II) Module amdgpu: vendor="X.Org Foundation"
[    76.621]    compiled for 1.17.4, module version = 0.0.1
[    76.621]    Module class: X.Org Video Driver
[    76.621]    ABI class: X.Org Video Driver, version 19.0
[    76.621] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    76.621] (II) AMDGPU: Driver for AMD Radeon chipsets: BONAIRE, BONAIRE, BONAIRE,
        BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE, BONAIRE, KABINI, KABINI,
        KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KABINI,
        KABINI, KABINI, KABINI, KABINI, KABINI, KABINI, KAVERI, KAVERI,
        KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
        KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI, KAVERI,
        KAVERI, KAVERI, KAVERI, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII,
        HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, HAWAII, TOPAZ, TOPAZ,
        TOPAZ, TOPAZ, TOPAZ, TONGA, TONGA, TONGA, TONGA, TONGA, TONGA, TONGA,
        TONGA, TONGA, CARRIZO, CARRIZO, CARRIZO, CARRIZO, CARRIZO, FIJI
[    76.621] (++) using VT number 7

[    76.624] (WW) Falling back to old probe method for modesetting
[    76.625] (II) [KMS] drm report modesetting isn't supported.
[    76.625] (EE) Screen 0 deleted because of no matching config section.
[    76.625] (II) UnloadModule: "amdgpu"
[    76.625] (EE) Device(s) detected, but none match those in the config file.
[    76.644] (EE)
Fatal server error:
[    76.644] (EE) no screens found(EE)
[    76.644] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[    76.644] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[    76.644] (EE)
[    76.645] (EE) Server terminated with error (1). Closing log file.