This option(*) solved the problem for me too!

(*) Option "LVDSBiosNativeMode" "false" to the Device section of
xorg.conf

My Hardware :
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon IGP 
330M/340M/350M (prog-if 00 [VGA])
        Subsystem: Hewlett-Packard Company Radeon IGP 345M
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping+ SERR- FastB2B+
        Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 66 (2000ns min), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at dc000000 (32-bit, prefetchable) [size=64M]
        Region 1: I/O ports at 9000 [size=256]
        Region 2: Memory at d4300000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at d4320000 [disabled] [size=128K]
        Capabilities: <access denied>

I attach my correct xorg.conf

** Attachment added: "Correct xorg.conf file"
   http://launchpadlibrarian.net/10179375/xorg.conf

-- 
Xorg ATI driver somewhat supports ATI Radeon IGP 
https://bugs.launchpad.net/bugs/155954
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