Macbook screen suddenly dims

I own a Macbook 3.1.
Since a couple of months I face the following problem:
My screen suddenly dims. This outcome of this malfunction is as if I dimmed it with the F1 button. However, I can see the screen but it's dimmed completely. When I use F2 button to give some more lightness, I see that the lightness icon appears in the (dimmed) screen but nothing happens.
The only way to "fix" temporarily the problem and restore the lightness of my screen is to close the lid and open it after a couple of seconds.
I recently upgraded to Lion but this happened also when I had Snow Leopard OS installed. Futhermore, it seems that this happens when the CPU is at high performance (ie write a CD/DVD, or running my USB TV card).
I 've also tried to reset the system management controller, the problem stoped but it appeared again after a couple of days.
The specs of my macbook are the following:
Model Identifier:          MacBook3,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          2,2 GHz
Number of Processors:          1
Total Number of Cores:          2
L2 Cache:          4 MB
Memory:          4 GB
Is there any solution that could fix my problem?
Thanks in advance!

My USB TV Card is the following:
AVerMedia H830M
Has anyone encountered something similar?
Does Apple technicians follow this forum?
If not, where can I open a case?

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    0x7f272be8 : 0x56da06 (0x463e7000 0x0 0x7f272e3c 0x7f272c74)
    0x7f272c38 : 0x56e2a5 (0xcf6720 0x463e7000 0x9197d88 0x1)
    0x7f272c88 : 0x56eb59 (0x463e7000 0x10 0x7f272cd0 0x0)
    0x7f272da8 : 0x286638 (0x463e7000 0x10 0x9197d88 0x1)
    0x7f273e58 : 0x21dbe5 (0x9197d60 0x9dc95a0 0x1f79e8 0x5d43)
    0x7f273e98 : 0x210a86 (0x9197d00 0x0 0x9362e70 0x9753850)
    0x7f273ef8 : 0x216f84 (0x9197d00 0x0 0x0 0x0)
    0x7f273f78 : 0x295c57 (0x90098c8 0x0 0x0 0x0)
    0x7f273fc8 : 0x2a256d (0x90098c4 0x1 0x10 0x90098c4)
          Kernel Extensions in backtrace (with dependencies):
             com.apple.GeForce(6.4.0)@0xc5c000->0xd12fff
                dependency: com.apple.NVDAResman(6.4.0)@0x96e000
                dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x961000
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x928000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x93f000
             com.apple.nvidia.nv50hal(6.4.0)@0x15a1000->0x19b5fff
                dependency: com.apple.NVDAResman(6.4.0)@0x96e000
             com.apple.NVDAResman(6.4.0)@0x96e000->0xc5bfff
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x928000
                dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x961000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x93f000
    BSD process name corresponding to current thread: WindowServer
    Mac OS version:
    10K549
    Kernel version:
    Darwin Kernel Version 10.8.0: Tue Jun  7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
    System model name: MacBookPro6,2 (Mac-F22586C8)
    System uptime in nanoseconds: 9874467987760
    unloaded kexts:
    com.apple.driver.AppleUSBUHCI          4.2.0 (addr 0x142d000, size 0x65536) - last unloaded 168161929835
    loaded kexts:
    com.apple.driver.AppleHWSensor          1.9.3d0 - last loaded 29001285875
    com.apple.filesystems.autofs          2.1.0
    com.apple.driver.AGPM          100.12.31
    com.apple.driver.AppleMikeyHIDDriver          1.2.0
    com.apple.driver.AppleHDA          2.0.5f14
    com.apple.driver.AppleUpstreamUserClient          3.5.7
    com.apple.driver.AppleMCCSControl          1.0.20
    com.apple.driver.AppleMikeyDriver          2.0.5f14
    com.apple.driver.AudioAUUC          1.57
    com.apple.driver.AppleIntelHDGraphics          6.4.0
    com.apple.driver.AppleIntelHDGraphicsFB          6.4.0
    com.apple.driver.SMCMotionSensor          3.0.1d2
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.1.6
    com.apple.GeForce          6.4.0
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
    com.apple.driver.AppleLPC          1.5.1
    com.apple.driver.AppleGraphicsControl          2.10.6
    com.apple.kext.AppleSMCLMU          1.5.2d10
    com.apple.driver.AppleUSBTCButtons          201.6
    com.apple.driver.AppleUSBCardReader          2.6.1
    com.apple.driver.AppleIRController          303.8
    com.apple.driver.AppleUSBTCKeyboard          201.6
    com.apple.BootCache          31.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    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.iokit.AppleBCM5701Ethernet          3.0.5b8
    com.apple.driver.AppleEFINVRAM          1.4.0
    com.apple.driver.AppleSmartBatteryManager          160.0.0
    com.apple.driver.AppleAHCIPort          2.1.7
    com.apple.driver.AirPortBrcm43224          428.42.4
    com.apple.driver.AppleUSBEHCI          4.2.4
    com.apple.driver.AppleACPIButtons          1.3.6
    com.apple.driver.AppleRTC          1.3.1
    com.apple.driver.AppleHPET          1.5
    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.IOBluetoothSerialManager          2.4.5f3
    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.driver.DspFuncLib          2.0.5f14
    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.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOAudioFamily          1.8.3fc2
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOHDAFamily          2.0.5f14
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.1
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.nvidia.nv50hal          6.4.0
    com.apple.NVDAResman          6.4.0
    com.apple.iokit.IONDRVSupport          2.2.1
    com.apple.iokit.IOGraphicsFamily          2.2.1
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
    com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.8
    com.apple.iokit.IOUSBMassStorageClass          2.6.7
    com.apple.driver.AppleUSBMultitouch          207.7
    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    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.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IO80211Family          320.1
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          6
    com.apple.driver.DiskImages          289.1
    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
    Model: MacBookPro6,2, BootROM MBP61.0057.B0C, 2 processors, Intel Core i7, 2.66 GHz, 4 GB, SMC 1.58f17
    Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
    Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
    Memory Module: global_name
    AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.42.4)
    Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 1 incoming serial ports
    Network Service: Ethernet, Ethernet, en0
    Serial ATA Device: Hitachi HTS545050B9SA02, 465.76 GB
    Serial ATA Device: MATSHITADVD-R   UJ-898
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
    USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0xfa130000 / 5
    USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0xfa120000 / 4
    USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 3
    USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8218, 0xfa113000 / 8
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
    USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0xfd120000 / 4
    USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0xfd110000 / 3
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    Hardware Overview:
      Model Name:          MacBook Pro
      Model Identifier:          MacBookPro6,2
      Processor Name:          Intel Core i7
      Processor Speed:          2.66 GHz
      Number Of Processors:          1
      Total Number Of Cores:          2
      L2 Cache (per core):          256 KB
      L3 Cache:          4 MB
      Memory:          4 GB
      Processor Interconnect Speed:          4.8 GT/s
      Boot ROM Version:          MBP61.0057.B0C
      SMC Version (system):          1.58f17
      Serial Number (system):          W8020YL3AGW
      Hardware UUID:          A70823EC-3897-57A0-BD2B-0F35CF62FA3F
      Sudden Motion Sensor:
      State:          Enabled

    nana4design wrote:
    panic(cpu 2 caller 0x9d4c9b): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xc0000000 0x7fa41000 0x0a5480a2, D0, P2/4
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    0x7f271c38 : 0x21b837 (0x5dd7fc 0x7f271c6c 0x223ce1 0x0)
    0x7f271c88 : 0x9d4c9b (0xbea28c 0xc5a800 0xbf8e60 0x0)
    0x7f271d28 : 0xaef608 (0x8d73c04 0x91cf004 0x100 0x16d47000)
    0x7f271d78 : 0xae6601 (0x91cf004 0x100 0x7f271da8 0x9c4778)
    0x7f271da8 : 0x16d79a6 (0x91cf004 0x100 0x438004ee 0x1)
    0x7f271ee8 : 0xb0e2b5 (0x91cf004 0x95d3004 0x0 0x0)
    0x7f271f28 : 0x9dde7c (0x91cf004 0x95d3004 0x0 0x0)
    0x7f271fc8 : 0x9da55b (0x0 0x9 0x0 0x0)
    0x7f272178 : 0x9dc6e7 (0x0 0x600d600d 0x7027 0x7f2721a8)
    0x7f272248 : 0xc8610d (0xc1d00046 0xbeef0003 0xc1ca580 0x71)
    0x7f2722e8 : 0xc86685 (0x46255000 0xc1ca580 0x14906804 0x0)
    0x7f272328 : 0xc5dec3 (0x46255000 0xc1ca580 0x14906804 0x0)
    0x7f272358 : 0xc85cba (0x46255000 0xc1ca580 0x14906804 0x0)
    0x7f272378 : 0xc5d418 (0x46255000 0xc1ca580 0x14906804 0x0)
    0x7f272398 : 0xc86630 (0x46255000 0x14906800 0x2 0x2)
    0x7f2723d8 : 0xc60905 (0x46255000 0x14906800 0x0 0x14934000)
    0x7f272418 : 0xc5e325 (0x46255000 0x463e7000 0x46485000 0x8e76b80)
    0x7f272468 : 0xcb14e9 (0x46255000 0x463e7000 0x46485000 0x8e76b80)
    0x7f2724f8 : 0xca2c9b (0x8e76b80 0x14934000 0x0 0x1)
    0x7f272558 : 0xca2f02 (0x463e7000 0x463e7788 0x14934000 0x0)
    0x7f2725a8 : 0xca33d6 (0x463e7000 0x463e7788 0x7f2728cc 0x7f27286c)
    0x7f2728e8 : 0xca01a1 (0x463e7000 0x463e7788 0x1 0x2209aa)
    0x7f272908 : 0xc6788f (0x463e7000 0x463e7788 0x14932fc0 0x507617)
    0x7f272938 : 0xca1c64 (0x463e7000 0x7f272a7c 0x7f272968 0x463e7000)
    0x7f272978 : 0xc6bc93 (0x463e7000 0x7f272a7c 0x7f272a7c 0x7f2729e0)
    0x7f272ab8 : 0xca55d8 (0x463e7000 0x1 0x7f272bcc 0x7f272bc8)
    0x7f272b68 : 0xc67fe1 (0x463e7000 0x1 0x7f272bcc 0x7f272bc8)
    0x7f272be8 : 0x56da06 (0x463e7000 0x0 0x7f272e3c 0x7f272c74)
    0x7f272c38 : 0x56e2a5 (0xcf6720 0x463e7000 0x9197d88 0x1)
    0x7f272c88 : 0x56eb59 (0x463e7000 0x10 0x7f272cd0 0x0)
    0x7f272da8 : 0x286638 (0x463e7000 0x10 0x9197d88 0x1)
    0x7f273e58 : 0x21dbe5 (0x9197d60 0x9dc95a0 0x1f79e8 0x5d43)
    0x7f273e98 : 0x210a86 (0x9197d00 0x0 0x9362e70 0x9753850)
    0x7f273ef8 : 0x216f84 (0x9197d00 0x0 0x0 0x0)
    0x7f273f78 : 0x295c57 (0x90098c8 0x0 0x0 0x0)
    0x7f273fc8 : 0x2a256d (0x90098c4 0x1 0x10 0x90098c4)
          Kernel Extensions in backtrace (with dependencies):
             com.apple.GeForce(6.4.0)@0xc5c000->0xd12fff
                dependency: com.apple.NVDAResman(6.4.0)@0x96e000
                dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x961000
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x928000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x93f000
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                dependency: com.apple.NVDAResman(6.4.0)@0x96e000
             com.apple.NVDAResman(6.4.0)@0x96e000->0xc5bfff
                dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x928000
                dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x961000
                dependency: com.apple.iokit.IOGraphicsFamily(2.2.1)@0x93f000
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