HI all, i'm using Mac Pro 15" Retina. My screen goes darker and after brighter after a while? How to fix it?

HI all, i'm using Mac Pro 15" Retina. My screen goes darker and after brighter after a while? How to fix it?

System Preferences > Displays.
De-select "Automatically adjust brightness"

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    Hello mac community, I am new,
    I updated a program today everything was working fine yesterday and now today I was updating PLAY a music engine program it seems to have caused the mac to go crazy. I also updated VE PRO 5 another music program. Everything has gone crazy. It turns on but then then the screen goes black after a while 5-10mins. I managed to get the crash report.
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    Sat Sep 28 10:49:06 2013
    panic(cpu 20 caller 0xffffff7f80f4775c): "ATICLASS::detectPowerDown: GPU is not found. PCI config access fails!!!\n"@/SourceCache/GraphicsDrivers/GraphicsDrivers-6.36.10/Common/IONDRV/ ATI/IOFramebuffer/ATIFramebuffer/Controller/Sources/R800/EvergreenClocks.cpp:825
    Backtrace (CPU 20), Frame : Return Address
    0xffffff83d2693a90 : 0xffffff8000204d15
    0xffffff83d2693b90 : 0xffffff7f80f4775c
    0xffffff83d2693bb0 : 0xffffff7f80f493dc
    0xffffff83d2693bd0 : 0xffffff7f8158cbe5
    0xffffff83d2693c00 : 0xffffff7f8158677c
    0xffffff83d2693c40 : 0xffffff7f80d9ac80
    0xffffff83d2693cc0 : 0xffffff7f80d99750
    0xffffff83d2693d00 : 0xffffff80005281dd
    0xffffff83d2693d70 : 0xffffff8000553deb
    0xffffff83d2693de0 : 0xffffff80002ba770
    0xffffff83d2693e50 : 0xffffff8000205536
    0xffffff83d2693e80 : 0xffffff80002029eb
    0xffffff83d2693ef0 : 0xffffff8000274176
    0xffffff83d2693f60 : 0xffffff80002c3095
    0xffffff83d2693fa0 : 0xffffff80002e4894
    Kernel Extensions in backtrace (with dependencies):
    com.apple.kext.ATIFramebuffer(6.3.6)@0xffffff7f81585000->0xffffff7f81598fff
                dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0xffffff7f80800000
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0xffffff7f80804000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0xffffff7f80d88000
                dependency: com.apple.kext.ATISupport(6.3.6)@0xffffff7f80e02000
    com.apple.kext.ATI5000Controller(6.3.6)@0xffffff7f80f30000->0xffffff7f80f5afff
                dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0xffffff7f80800000
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0xffffff7f80804000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0xffffff7f80d88000
                dependency: com.apple.kext.ATISupport(6.3.6)@0xffffff7f80e02000
    com.apple.iokit.IOGraphicsFamily(2.2.1)@0xffffff7f80d88000->0xffffff7f80daffff
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0xffffff7f80804000
    BSD process name corresponding to current thread: WindowServer
    Mac OS version:
    10K549
    Kernel version:
    Darwin Kernel Version 10.8.0: Tue Jun  7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64
    System model name: MacPro5,1 (Mac-F221BEC8)
    System uptime in nanoseconds: 12612076511
    unloaded kexts:
    (none)
    loaded kexts:
    com.audinate.dante.driver.DanteVirtualSoundcard     0.9.3
    com.paceap.kext.pacesupport.snowleopard       5.8
    com.Areca.ArcMSR  1.3.3
    com.apple.filesystems.autofs    2.1.0
    com.apple.driver.AppleTyMCEDriver 1.0.2d2
    com.apple.driver.AGPM    100.12.31
    com.apple.driver.AppleHWSensor     1.9.3d0
    com.apple.driver.AudioAUUC    1.57
    com.apple.driver.AppleUpstreamUserClient       3.5.7
    com.apple.driver.AppleMCCSControl 1.0.20
    com.apple.driver.AppleMikeyHIDDriver      1.2.0
    com.apple.kext.ATIFramebuffer        6.3.6
    com.apple.driver.AppleIntelPenrynProfile   17
    com.apple.Dont_Steal_Mac_OS_X    7.0.0
    com.apple.driver.AppleMikeyDriver    2.0.5f14
    com.apple.ATIRadeonX3000     6.3.6
    com.apple.driver.AppleIntelNehalemProfile        11
    com.apple.driver.AppleHDA      2.0.5f14
    com.apple.driver.AudioIPCDriver       1.1.6
    com.apple.driver.AirPortBrcm43xx     423.91.27
    com.apple.driver.Intel82574L    2.1.8b1
    com.apple.driver.AppleIntelMeromProfile   19
    com.apple.driver.AirPortBrcm43224  428.42.4
    com.apple.driver.ACPI_SMC_PlatformPlugin     4.7.0a1
    com.apple.driver.AppleLPC       1.5.1
    com.apple.driver.AppleIntel8254XEthernet 2.1.3b1
    com.apple.filesystems.ntfs        3.4
    com.apple.iokit.SCSITaskUserClient  2.6.8
    com.apple.iokit.IOAHCIBlockStorage 1.6.4
    com.apple.driver.AppleUSBHub 4.2.4
    com.apple.driver.AppleFWOHCI        4.7.3
    com.apple.driver.AppleUSBEHCI       4.2.4
    com.apple.BootCache       31.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib 1.0.0d1
    com.apple.driver.AppleAHCIPort       2.1.7
    com.apple.driver.AppleUSBUHCI       4.2.0
    com.apple.driver.AppleEFINVRAM    1.4.0
    com.apple.driver.AppleRTC       1.3.1
    com.apple.driver.AppleHPET     1.5
    com.apple.driver.AppleACPIButtons  1.3.6
    com.apple.driver.AppleSMBIOS        1.7
    com.apple.driver.AppleACPIEC 1.3.6
    com.apple.driver.AppleAPIC      1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient  142.6.0
    com.apple.security.sandbox      1
    com.apple.security.quarantine   0
    com.apple.nke.applicationfirewall       2.1.14
    com.apple.driver.AppleIntelCPUPowerManagement   142.6.0
    com.apple.iokit.IOSCSIBlockCommandsDevice 2.6.8 - last loaded 12365095188
    com.apple.driver.AppleProfileReadCounterAction       17
    com.apple.driver.AppleProfileTimestampAction  10
    com.apple.driver.AppleProfileThreadInfoAction  14
    com.apple.driver.AppleProfileRegisterStateAction      10
    com.apple.driver.AppleProfileKEventAction        10
    com.apple.driver.AppleProfileCallstackAction     20
    com.apple.iokit.IOSurface 74.2
    com.apple.iokit.IOBluetoothSerialManager 2.4.5f3
    com.apple.iokit.IOSerialFamily  10.0.3
    com.apple.driver.AppleHDAHardwareConfigDriver     2.0.5f14
    com.apple.driver.DspFuncLib    2.0.5f14
    com.apple.iokit.IONDRVSupport        2.2.1
    com.apple.iokit.IOAudioFamily  1.8.3fc2
    com.apple.kext.OSvKernDSPLib       1.3
    com.apple.driver.AppleSMBusController    1.0.10d0
    com.apple.iokit.IOFireWireIP     2.0.3
    com.apple.kext.ATI5000Controller     6.3.6
    com.apple.kext.ATISupport       6.3.6
    com.apple.iokit.AppleProfileFamily     41
    com.apple.driver.AppleHDAController        2.0.5f14
    com.apple.iokit.IOGraphicsFamily     2.2.1
    com.apple.iokit.IOHDAFamily    2.0.5f14
    com.apple.iokit.IO80211Family  320.1
    com.apple.driver.AppleSMC      3.1.0d5
    com.apple.driver.IOPlatformPluginFamily   4.7.0a1
    com.apple.driver.AppleSMBusPCI     1.0.10d0
    com.apple.iokit.IONetworkingFamily  1.10
    com.apple.driver.BroadcomUSBBluetoothHCIController     2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController    2.4.5f3
    com.apple.iokit.IOBluetoothFamily     2.4.5f3
    com.apple.driver.AppleUSBMergeNub       4.2.4
    com.apple.driver.AppleUSBComposite       3.9.0
    com.apple.driver.XsanFilter       402.1
    com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.6.8
    com.apple.iokit.IOBDStorageFamily   1.6
    com.apple.iokit.IODVDStorageFamily        1.6
    com.apple.iokit.IOCDStorageFamily  1.6.1
    com.apple.iokit.IOUSBUserClient      4.2.4
    com.apple.iokit.IOAHCISerialATAPI   1.2.6
    com.apple.iokit.IOFireWireFamily      4.2.6
    com.apple.driver.AppleFileSystemDriver    2.0
    com.apple.iokit.IOAHCIFamily   2.0.6
    com.apple.iokit.IOUSBFamily    4.2.4
    com.apple.iokit.IOSCSIParallelFamily        2.1.1
    com.apple.iokit.IOSCSIArchitectureModelFamily        2.6.8
    com.apple.driver.AppleEFIRuntime    1.4.0
    com.apple.iokit.IOHIDFamily     1.6.6
    com.apple.iokit.IOSMBusFamily        1.1
    com.apple.security.TMSafetyNet       6
    com.apple.kext.AppleMatch      1.0.0d1
    com.apple.driver.DiskImages    289
    com.apple.iokit.IOStorageFamily       1.6.3
    com.apple.driver.AppleACPIPlatform 1.3.6
    com.apple.iokit.IOPCIFamily     2.6.5
    com.apple.iokit.IOACPIFamily   1.3.0
    Cubase has this error
    Process:         Cubase 6 [222]
    Path:            /Applications/Cubase 6.app/Contents/MacOS/Cubase 6
    Identifier:      com.steinberg.cubase
    Version:         6.0.7.364 (6.0.7.364)
    Code Type:       X86-64 (Native)
    Parent Process:  launchd [144]
    Date/Time:       2013-09-28 10:50:35.845 +0100
    OS Version:      Mac OS X 10.6.8 (10K549)
    Report Version:  6
    Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
    Exception Codes: KERN_INVALID_ADDRESS at 0x000000012473fd9f
    Crashed Thread:  0  Dispatch queue: com.apple.main-thread
    Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
    0   ???                             0x000000012473fd9f 0 + 4906548639
    1   dyld                             0x00007fff5fc0c839 ImageLoader::link(ImageLoader::LinkContext const&, bool, bool, ImageLoader::RPathChain const&) + 201
    2   dyld                             0x00007fff5fc04d48 dyld::link(ImageLoader*, bool, ImageLoader::RPathChain const&) + 118
    3   dyld                             0x00007fff5fc08f68 dlopen + 490
    4   libSystem.B.dylib                 0x00007fff87a9be40 dlopen + 61
    5   com.apple.CoreFoundation          0x00007fff8223eef7 _CFBundleDlfcnLoadBundle + 231
    6   com.apple.CoreFoundation          0x00007fff8223de97 _CFBundleLoadExecutableAndReturnError + 1191
    7   com.apple.CoreFoundation          0x00007fff822cb30e CFBundleLoadExecutableAndReturnError + 14
    8   com.steinberg.cubase                  0x00000001011e8e55 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 69941
    9   com.steinberg.cubase                  0x00000001011e93f0 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 71376
    10  com.steinberg.cubase                 0x0000000100402690 0x100000000 + 4204176
    11  com.steinberg.cubase                 0x00000001011d8e77 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 4439
    12  com.steinberg.cubase                 0x00000001011e86b7 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 67991
    13  com.steinberg.cubase                 0x00000001011e892e CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 68622
    14  com.steinberg.cubase                 0x00000001011e8a64 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 68932
    15  com.steinberg.cubase                 0x00000001007c68ab 0x100000000 + 8153259
    16  com.steinberg.cubase                 0x0000000100d149c0 0x100000000 + 13715904
    17  com.steinberg.cubase                 0x0000000101277b99 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 654969
    18  com.steinberg.cubase                 0x0000000100d16dbd 0x100000000 + 13725117
    19  com.steinberg.cubase                 0x000000010116b048 0x100000000 + 18264136
    20  com.steinberg.cubase                 0x00000001000d39c4 0x100000000 + 866756
    Thread 1:  Dispatch queue: com.apple.libdispatch-manager
    0   libSystem.B.dylib                 0x00007fff87aaec0a kevent + 10
    1   libSystem.B.dylib                 0x00007fff87ab0add _dispatch_mgr_invoke + 154
    2   libSystem.B.dylib                 0x00007fff87ab07b4 _dispatch_queue_invoke + 185
    3   libSystem.B.dylib                 0x00007fff87ab02de _dispatch_worker_thread2 + 252
    4   libSystem.B.dylib                 0x00007fff87aafc08 _pthread_wqthread + 353
    5   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 2:
    0   libSystem.B.dylib                 0x00007fff87aafa2a __workq_kernreturn + 10
    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 3:  FThread
    0   libSystem.B.dylib                 0x00007fff87a95dce semaphore_timedwait_trap + 10
    1   com.steinberg.cubase                  0x00000001014f8437 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 3278615
    2   com.steinberg.cubase                  0x00000001007c8be0 0x100000000 + 8162272
    3   com.steinberg.cubase                  0x00000001014f8eb0 CSOLOISTExtendedAnalysis::~CSOLOISTExtendedAnalysis() + 3281296
    4   libSystem.B.dylib                 0x00007fff87b7129a _pthread_body + 24
    Thread 4:
    0   libSystem.B.dylib                 0x00007fff87aafa2a __workq_kernreturn + 10
    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 5:
    0   libSystem.B.dylib                 0x00007fff87a95dda semaphore_timedwait_signal_trap + 10
    1   libSystem.B.dylib                 0x00007fff87ad4772 _pthread_cond_wait + 1015
    2   com.apple.CoreVideo                   0x00007fff82fbade6 CVDisplayLink::waitUntil(unsigned long long) + 252
    3   com.apple.CoreVideo                   0x00007fff82fba2a2 CVDisplayLink::runIOThread() + 644
    4   com.apple.CoreVideo                   0x00007fff82fb9fe3 startIOThread(void*) + 139
    5   libSystem.B.dylib                 0x00007fff87acefd6 _pthread_start + 331
    6   libSystem.B.dylib                 0x00007fff87acee89 thread_start + 13
    Thread 6:
    0   libSystem.B.dylib                 0x00007fff87aafa2a __workq_kernreturn + 10
    1   libSystem.B.dylib                 0x00007fff87aafe3c _pthread_wqthread + 917
    2   libSystem.B.dylib                 0x00007fff87aafaa5 start_wqthread + 13
    Thread 0 crashed with X86 Thread State (64-bit):
      rax: 0x00000001211f4000  rbx: 0x00007fff5fc43ae8  rcx: 0x00007fff5fc019df  rdx: 0x00007fff5fbfdd20
      rdi: 0x00000001211f4000  rsi: 0x00000001211f4000  rbp: 0x00007fff5fbfe170  rsp: 0x00007fff5fbfdce8
       r8: 0x0000000000000000   r9: 0x00007fff8abcf420  r10: 0x0000000000000000  r11: 0x00007fff8abcf420
      r12: 0x00000001224521e0  r13: 0x00000001211f4000  r14: 0x000000012473fd9f  r15: 0x00007fff5fbfdcf0
      rip: 0x000000012473fd9f  rfl: 0x0000000000010212  cr2: 0x000000012473fd9f
    Binary Images:
           0x100000000 -        0x1022a4fe7 +com.steinberg.cubase 6.0.7.364 (6.0.7.364) <CFFF5ABF-970D-896D-4A88-78FFF87878C1> /Applications/Cubase 6.app/Contents/MacOS/Cubase 6
           0x10268c000 -        0x1026dcff7  com.apple.audio.midi.CoreMIDI 1.7.1 (42) <E7DBCE93-A637-ABA2-B623-6A76B82EE243> /System/Library/Frameworks/CoreMIDI.framework/Versions/A/CoreMIDI
           0x102704000 -        0x10270aff7  com.apple.agl 3.0.12 (AGL-3.0.12) <014CA38F-CB49-8214-4C16-DF73FC6EFCE1> /System/Library/Frameworks/AGL.framework/Versions/A/AGL
           0x105f00000 -        0x105f89ff2 +com.eLicenser.POSAccess-DLL ??? (1.12.1.0) <66A02345-5109-F38C-1262-D00D8189324C> /Library/Application Support/eLicenser/pos/Synsoacc.bundle/Contents/MacOS/Synsoacc
           0x1170a6000 -        0x1170ccfff  GLRendererFloat ??? (???) <38621D22-8F49-F937-851B-E21BD49A8A88> /System/Library/Frameworks/OpenGL.framework/Resources/GLRendererFloat.bundle/GL RendererFloat
           0x11a17a000 -        0x11a30dfe7  GLEngine ??? (???) <BCE83654-81EC-D231-ED6E-1DD449B891F2> /System/Library/Frameworks/OpenGL.framework/Resources/GLEngine.bundle/GLEngine
           0x11a33e000 -        0x11a730fff  com.apple.ATIRadeonX3000GLDriver 1.6.36 (6.3.6) <282E53E2-ABB3-B97D-F298-6A8FE21F3A5A> /System/Library/Extensions/ATIRadeonX3000GLDriver.bundle/Contents/MacOS/ATIRade onX3000GLDriver
           0x11b243000 -        0x11b249fe7  libFontStreams.A.dylib 545.0.0 (compatibility 64.0.0) <87272933-FB21-81D0-00E6-92BC3D7583FB> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libFontStreams.A.dylib
           0x1211f4000 -        0x121303fff +com.steinberg.omffilter 4.0.0.179 (4.0.0.179) <C05588E9-6173-ECEF-2BF1-92AE05B78913> /Applications/Cubase 6.app/Contents/Components/omffilter.bundle/Contents/MacOS/omffilter
        0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???) <69130DA3-7CB3-54C8-ABC5-423DECDD2AF7> /usr/lib/dyld
        0x7fff80003000 -     0x7fff80059fe7  libTIFF.dylib ??? (???) <2DBEC120-DAA7-3789-36A2-A205BCDF2D72> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ImageIO.framework/Versions/A/Resources/libTIFF.dylib
        0x7fff8008f000 -     0x7fff8011ffff  com.apple.SearchKit 1.3.0 (1.3.0) <4175DC31-1506-228A-08FD-C704AC9DF642> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchK it.framework/Versions/A/SearchKit
        0x7fff80132000 -     0x7fff80179ff7  com.apple.coreui 2 (114) <923E33CC-83FC-7D35-5603-FB8F348EE34B> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
        0x7fff80453000 -     0x7fff8048dfff  libcups.2.dylib 2.8.0 (compatibility 2.0.0) <4F2A4397-89BD-DEAC-4971-EE838FFA0964> /usr/lib/libcups.2.dylib
        0x7fff80c2c000 -     0x7fff81626ff7  com.apple.AppKit 6.6.8 (1038.36) <4CFBE04C-8FB3-B0EA-8DDB-7E7D10E9D251> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
        0x7fff81627000 -     0x7fff816dcfe7  com.apple.ink.framework 1.3.3 (107) <8C36373C-5473-3A6A-4972-BC29D504250F> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework /Versions/A/Ink
        0x7fff8189e000 -     0x7fff81938fff  com.apple.ApplicationServices.ATS 275.19 (???) <2DE8987F-4563-4D8E-45C3-2F6F786E120D> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ ATS.framework/Versions/A/ATS
        0x7fff8199c000 -     0x7fff81c1efff  com.apple.Foundation 6.6.8 (751.63) <E10E4DB4-9D5E-54A8-3FB6-2A82426066E4> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
        0x7fff81c1f000 -     0x7fff81c1fff7  com.apple.Carbon 150 (152) <C0E61968-57F3-6EE1-8524-32A18955BAF0> /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
        0x7fff81c20000 -     0x7fff81c26ff7  com.apple.CommerceCore 1.0 (9.1) <3691E9BA-BCF4-98C7-EFEC-78DA6825004E> /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Frameworks/C ommerceCore.framework/Versions/A/CommerceCore
        0x7fff81c7f000 -     0x7fff81c8cfe7  libCSync.A.dylib 545.0.0 (compatibility 64.0.0) <1C35FA50-9C70-48DC-9E8D-2054F7A266B1> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
        0x7fff81c8d000 -     0x7fff82196ff7  com.apple.RawCamera.bundle 3.14.0 (646) <75A96BFC-1832-808B-F430-C4C9379C5A98> /System/Library/CoreServices/RawCamera.bundle/Contents/MacOS/RawCamera
        0x7fff82197000 -     0x7fff821ecff7  com.apple.framework.familycontrols 2.0.2 (2020) <F09541B6-5E28-1C01-C1AE-F6A2508670C7> /System/Library/PrivateFrameworks/FamilyControls.framework/Versions/A/FamilyCon trols
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    Hold the power button down for 10+ seconds.  Then bring the MBP to an Apple store for an evaluation.
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