ati + gentoo = no screen found :(

Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "aticonfig-Screen[0]-0" 0 0
        Screen         "aticonfig-Screen[0]-0" RightOf "aticonfig-Screen[0]-0"
EndSection
Section "Module"
EndSection
Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection
Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection
Section "Device"
        Identifier  "radeon"
        Driver      "radeon"
EndSection
Section "Device"
        Identifier  "aticonfig-Device[0]-0"
        Driver      "fglrx"
        BusID       "PCI:1:0:0"
EndSection
Section "Screen"
        Identifier "aticonfig-Screen[0]-0"
        Device     "aticonfig-Device[0]-0"
        Monitor    "aticonfig-Monitor[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection
Section "Screen"
        Identifier "aticonfig-Screen[0]-0"
        Device     "aticonfig-Device[0]-0"
        Monitor    "aticonfig-Monitor[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "aticonfig-Screen[0]-0" 0 0
EndSection
Section "Module"
EndSection
Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection
Section "Device"
        Identifier  "aticonfig-Device[0]-0"
        Driver      "fglrx"
        BusID       "PCI:1:0:0"
EndSection
Section "Screen"
        Identifier "aticonfig-Screen[0]-0"
        Device     "aticonfig-Device[0]-0"
        Monitor    "aticonfig-Monitor[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

[  3476.495]
X.Org X Server 1.12.2
Release Date: 2012-05-29
[  3476.496] X Protocol Version 11, Revision 0
[  3476.496] Build Operating System: Linux 3.5.7-gentoo x86_64 Gentoo
[  3476.496] Current Operating System: Linux localhost 3.5.7-gentoo #1 SMP Thu Nov 15 14:34:56 Local time zone must be set--see zic  x86_64
[  3476.496] Kernel command line: root=/dev/ram0 real_root=/dev/sda5
[  3476.496] Build Date: 14 November 2012  01:28:55PM
[  3476.496]
[  3476.496] Current version of pixman: 0.26.0
[  3476.497]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[  3476.497] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  3476.498] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Nov 15 19:10:21 2012
[  3476.498] (==) Using config file: "/etc/X11/xorg.conf"
[  3476.498] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[  3476.498] (==) ServerLayout "aticonfig Layout"
[  3476.498] (**) |-->Screen "aticonfig-Screen[0]-0" (0)
[  3476.498] (**) |   |-->Monitor "aticonfig-Monitor[0]-0"
[  3476.498] (**) |   |-->Device "aticonfig-Device[0]-0"
[  3476.498] (==) Automatically adding devices
[  3476.498] (==) Automatically enabling devices
[  3476.498] (WW) The directory "/usr/share/fonts/TTF/" does not exist.
[  3476.498]    Entry deleted from font path.
[  3476.498] (WW) The directory "/usr/share/fonts/OTF/" does not exist.
[  3476.498]    Entry deleted from font path.
[  3476.498] (WW) The directory "/usr/share/fonts/Type1/" does not exist.
[  3476.498]    Entry deleted from font path.
[  3476.498] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/100dpi/".
[  3476.498]    Entry deleted from font path.
[  3476.498]    (Run 'mkfontdir' on "/usr/share/fonts/100dpi/").
[  3476.498] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/75dpi/".
[  3476.498]    Entry deleted from font path.
[  3476.498]    (Run 'mkfontdir' on "/usr/share/fonts/75dpi/").
[  3476.498] (==) FontPath set to:
        /usr/share/fonts/misc/
[  3476.498] (==) ModulePath set to "/usr/lib64/xorg/modules"
[  3476.498] (II) The server relies on udev to provide the list of input devices.
        If no devices become available, reconfigure udev or disable AutoAddDevices.
[  3476.498] (II) Loader magic: 0x7d5ac0
[  3476.498] (II) Module ABI versions:
[  3476.498]    X.Org ANSI C Emulation: 0.4
[  3476.498]    X.Org Video Driver: 12.0
[  3476.498]    X.Org XInput driver : 16.0
[  3476.498]    X.Org Server Extension : 6.0
[  3476.499] (--) PCI:*(0:0:2:0) 8086:0166:103c:1897 rev 9, Mem @ 0xc1000000/4194304, 0xb0000000/268435456, I/O @ 0x00004000/64
[  3476.499] (--) PCI: (0:1:0:0) 1002:6840:103c:1897 rev 0, Mem @ 0xa0000000/268435456, 0xc0000000/131072, I/O @ 0x00003000/256, BIOS @ 0x????????/131072
[  3476.499] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[  3476.499] (II) "extmod" will be loaded by default.
[  3476.499] (II) "dbe" will be loaded by default.
[  3476.499] (II) "glx" will be loaded by default.
[  3476.499] (II) "record" will be loaded by default.
[  3476.499] (II) "dri" will be loaded by default.
[  3476.499] (II) "dri2" will be loaded by default.
[  3476.499] (II) LoadModule: "extmod"
[  3476.499] (II) Loading /usr/lib64/xorg/modules/extensions/libextmod.so
[  3476.499] (II) Module extmod: vendor="X.Org Foundation"
[  3476.499]    compiled for 1.12.2, module version = 1.0.0
[  3476.499]    Module class: X.Org Server Extension
[  3476.499]    ABI class: X.Org Server Extension, version 6.0
[  3476.499] (II) Loading extension MIT-SCREEN-SAVER
[  3476.499] (II) Loading extension XFree86-VidModeExtension
[  3476.499] (II) Loading extension XFree86-DGA
[  3476.499] (II) Loading extension DPMS
[  3476.499] (II) Loading extension XVideo
[  3476.499] (II) Loading extension XVideo-MotionCompensation
[  3476.499] (II) Loading extension X-Resource
[  3476.499] (II) LoadModule: "dbe"
[  3476.499] (II) Loading /usr/lib64/xorg/modules/extensions/libdbe.so
[  3476.499] (II) Module dbe: vendor="X.Org Foundation"
[  3476.499]    compiled for 1.12.2, module version = 1.0.0
[  3476.499]    Module class: X.Org Server Extension
[  3476.499]    ABI class: X.Org Server Extension, version 6.0
[  3476.499] (II) Loading extension DOUBLE-BUFFER
[  3476.500] (II) LoadModule: "glx"
[  3476.500] (II) Loading /usr/lib64/xorg/modules/extensions/libglx.so
[  3476.500] (II) Module glx: vendor="Advanced Micro Devices, Inc."
[  3476.500]    compiled for 6.9.0, module version = 1.0.0
[  3476.500] (II) Loading extension GLX
[  3476.500] (II) LoadModule: "record"
[  3476.500] (II) Loading /usr/lib64/xorg/modules/extensions/librecord.so
[  3476.500] (II) Module record: vendor="X.Org Foundation"
[  3476.500]    compiled for 1.12.2, module version = 1.13.0
[  3476.500]    Module class: X.Org Server Extension
[  3476.500]    ABI class: X.Org Server Extension, version 6.0
[  3476.500] (II) Loading extension RECORD
[  3476.500] (II) LoadModule: "dri"
[  3476.500] (WW) Warning, couldn't open module dri
[  3476.500] (II) UnloadModule: "dri"
[  3476.500] (II) Unloading dri
[  3476.500] (EE) Failed to load module "dri" (module does not exist, 0)
[  3476.500] (II) LoadModule: "dri2"
[  3476.500] (WW) Warning, couldn't open module dri2
[  3476.500] (II) UnloadModule: "dri2"
[  3476.500] (II) Unloading dri2
[  3476.500] (EE) Failed to load module "dri2" (module does not exist, 0)
[  3476.500] (II) LoadModule: "fglrx"
[  3476.500] (II) Loading /usr/lib64/xorg/modules/drivers/fglrx_drv.so
[  3476.511] (II) Module fglrx: vendor="FireGL - AMD Technologies Inc."
[  3476.511]    compiled for 1.4.99.906, module version = 8.98.2
[  3476.511]    Module class: X.Org Video Driver
[  3476.511] (II) Loading sub module "fglrxdrm"
[  3476.511] (II) LoadModule: "fglrxdrm"
[  3476.511] (II) Loading /usr/lib64/xorg/modules/linux/libfglrxdrm.so
[  3476.511] (II) Module fglrxdrm: vendor="FireGL - AMD Technologies Inc."
[  3476.511]    compiled for 1.4.99.906, module version = 8.98.2
[  3476.511] (II) AMD Proprietary Linux Driver Version Identifier:8.98.2
[  3476.511] (II) AMD Proprietary Linux Driver Release Identifier: 8.98
[  3476.511] (II) AMD Proprietary Linux Driver Build Date: Jun 11 2012 11:57:59
[  3476.511] (--) using VT number 7
[  3476.514] (WW) Falling back to old probe method for fglrx
[  3476.517] (II) Loading PCS database from /etc/ati/amdpcsdb
[  3476.518] (--) Chipset Supported AMD Graphics Processor (0x6840) found
[  3476.518] (II) fglrx: intel VGA device detected, load intel driver.
[  3476.518] (II) LoadModule: "intel"
[  3476.518] (WW) Warning, couldn't open module intel
[  3476.518] (II) UnloadModule: "intel"
[  3476.518] (II) Unloading intel
[  3476.518] (EE) Failed to load module "intel" (module does not exist, 0)
[  3476.518] (WW) fglrx: Fail to load intel driver!
[  3476.518] (II) AMD Video driver is running on a device belonging to a group targeted for this release
[  3476.519] (II) AMD Video driver is signed
[  3476.519] (II) fglrx(0): pEnt->device->identifier=0x7fe8a0
[  3476.519] (II) fglrx(0): === [xdl_xs112_atiddxPreInit] === begin
[  3476.519] (**) fglrx(0): Depth 24, (--) framebuffer bpp 32
[  3476.519] (II) fglrx(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps)
[  3476.519] (==) fglrx(0): Default visual is TrueColor
[  3476.519] (**) fglrx(0): Option "DPMS" "true"
[  3476.519] (==) fglrx(0): RGB weight 888
[  3476.519] (II) fglrx(0): Using 8 bits per RGB
[  3476.519] (==) fglrx(0): Buffer Tiling is ON
[  3476.519] (II) Loading sub module "fglrxdrm"
[  3476.519] (II) LoadModule: "fglrxdrm"
[  3476.519] (II) Loading /usr/lib64/xorg/modules/linux/libfglrxdrm.so
[  3476.519] (II) Module fglrxdrm: vendor="FireGL - AMD Technologies Inc."
[  3476.519]    compiled for 1.4.99.906, module version = 8.98.2
[  3476.520] ukiDynamicMajor: found major device number 247
[  3476.520] ukiDynamicMajor: found major device number 247
[  3476.520] ukiOpenByBusid: Searching for BusID PCI:1:0:0
[  3476.520] ukiOpenDevice: node name is /dev/ati/card0
[  3476.520] ukiOpenDevice: open result is 11, (OK)
[  3476.520] ukiOpenByBusid: ukiOpenMinor returns 11
[  3476.520] ukiOpenByBusid: ukiGetBusid reports PCI:1:0:0
[  3476.520] (**) fglrx(0): NoAccel = NO
[  3476.520] (**) fglrx(0): AMD 2D Acceleration Architecture enabled
[  3476.520] (--) fglrx(0): Chipset: "AMD Radeon HD 7600M Series" (Chipset = 0x6840)
[  3476.520] (--) fglrx(0): (PciSubVendor = 0x103c, PciSubDevice = 0x1897)
[  3476.520] (==) fglrx(0): board vendor info: third party graphics adapter - NOT original AMD
[  3476.520] (--) fglrx(0): Linear framebuffer (phys) at 0xa0000000
[  3476.520] (--) fglrx(0): MMIO registers at 0xc0000000
[  3476.520] (--) fglrx(0): I/O port at 0x00003000
[  3476.520] (==) fglrx(0): ROM-BIOS at 0x000c0000
[  3476.580] (II) fglrx(0): AC Adapter is used
[  3476.581] (II) fglrx(0): Invalid ATI BIOS from int10, the adapter is not VGA-enabled
[  3476.581] (EE) fglrx(0): Invalid video BIOS signature!
[  3476.581] (EE) fglrx(0): GetBIOSParameter failed
[  3476.581] (EE) fglrx(0): PreInitAdapter failed
[  3476.581] (EE) fglrx(0): PreInit failed
[  3476.581] (II) fglrx(0): === [xdl_xs112_atiddxPreInit] === end
[  3476.581] (II) fglrx(0): Interrupt handler Shutdown.
[  3476.582] (II) UnloadModule: "fglrx"
[  3476.582] (II) UnloadSubModule: "fglrxdrm"
[  3476.582] (II) Unloading fglrxdrm
[  3476.582] (II) UnloadSubModule: "fglrxdrm"
[  3476.582] (EE) Screen(s) found, but none have a usable configuration.
[  3476.582]
Fatal server error:
[  3476.582] no screens found
[  3476.582]
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[  3476.582] Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[  3476.582]
[  3476.585] Server terminated with error (1). Closing log file.

00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: agpgart-intel
        Kernel modules: intel-agp
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
        Kernel driver in use: pcieport
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
        Subsystem: Hewlett-Packard Company Device 1897
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: ehci_hcd
        Kernel modules: ehci-hcd
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd-hda-intel
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
        Kernel driver in use: pcieport
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
        Kernel driver in use: pcieport
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: ehci_hcd
        Kernel modules: ehci-hcd
00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: ahci
        Kernel modules: ahci
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel modules: i2c-i801
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Thames XT/GL [Radeon HD 7600M Series]
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: fglrx_pci
        Kernel modules: fglrx
07:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5289 (rev 01)
        Subsystem: Hewlett-Packard Company Device 1897
07:00.2 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 0a)
        Subsystem: Hewlett-Packard Company Device 1897
        Kernel driver in use: r8169
        Kernel modules: r8169
08:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)
        Subsystem: Hewlett-Packard Company Device 1795

fglrx: module license 'Proprietary. (C) 2002 - ATI Technologies, Starnberg, GERMANY' taints kernel.
Disabling lock debugging due to kernel taint
[fglrx] Maximum main memory to use for locked dma buffers: 3702 MBytes.
[fglrx]   vendor: 1002 device: 6840 count: 1
[fglrx] ioport: bar 4, base 0x3000, size: 0x100
pci 0000:01:00.0: enabling device (0000 -> 0003)
[fglrx] Kernel PAT support is enabled
[fglrx] module loaded - fglrx 8.98.2 [Jun 11 2012] with 1 minors
kvm: disabled by bios
ACPI Warning: 0x0000000000004040-0x000000000000405f SystemIO conflicts with Region \_SB_.PCI0.SBUS.SMBI 1 (20120320/utaddress-251)
ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver