I've same problem on Packard Bell EasyNote TH36 and setpci command onto rc.local work's fine. Below some useful information.

From dmidecode:
Manufacturer: Packard Bell    
Product Name: EasyNote TH36   
Version: V1.02

From lspci:
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] Device 0459
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 44
        Region 0: Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at 50f0 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee0300c  Data: 4191
        Capabilities: [d0] Power Management version 3
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Kernel driver in use: i915
        Kernel modules: i915

From sysfs:
root@amedeo:~# systool -c backlight -v
Class = "backlight"

  Class Device = "acpi_video0"
  Class Device path = "/sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0"
    actual_brightness   = "9"
    bl_power            = "0"
    brightness          = "9"
    max_brightness      = "9"
    type                = "firmware"
    uevent              = 

    Device = "0000:00:02.0"
    Device path = "/sys/devices/pci0000:00/0000:00:02.0"
      boot_vga            = "1"
      broken_parity_status= "0"
      class               = "0x030000"
      config              =  86 80 42 2a 07 04 90 00  09 00 00 03 00 00 80 00
                             04 00 00 d0 00 00 00 00  0c 00 00 c0 00 00 00 00
                             f1 50 00 00 00 00 00 00  00 00 00 00 25 10 59 04
                             00 00 00 00 90 00 00 00  00 00 00 00 0b 01 00 00
                             00 00 00 00 48 00 00 00  09 00 0a 61 b1 6d 51 1f
                             b9 e1 70 03 19 00 00 00  00 00 00 00 00 00 00 bc
                             00 00 00 00 00 00 02 00  00 00 00 00 00 00 00 00
                             00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
                             00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
                             05 d0 01 00 0c 30 e0 fe  91 41 00 00 00 00 00 00
                             00 00 00 00 09 00 06 20  00 00 00 00 00 00 00 00
                             00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
                             00 00 00 00 00 00 00 00  00 00 00 00 40 01 00 00
                             01 00 23 00 00 00 00 00  00 00 00 00 34 00 00 00
                             00 00 00 00 00 00 00 00  00 80 00 1a 41 20 00 00
                             0b 19 34 07 00 00 00 00  a0 0f 09 00 18 c0 a8 bb
      consistent_dma_mask_bits= "36"
      device              = "0x2a42"
      dma_mask_bits       = "36"
      enable              = "1"
      irq                 = "44"
      local_cpulist       = "0-1"
      local_cpus          = "00000000,00000003"
      modalias            = "pci:v00008086d00002A42sv00001025sd00000459bc03sc00i00"
      msi_bus             = 
      numa_node           = "-1"
      remove              = <store method only>
      rescan              = <store method only>
      reset               = <store method only>
      resource            = "0x00000000d0000000 0x00000000d03fffff 0x0000000000140204
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x00000000c0000000 0x00000000cfffffff 0x000000000014220c
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x00000000000050f0 0x00000000000050f7 0x0000000000040101
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 0x0000000000000002
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 0x0000000000000000"
      subsystem_device    = "0x0459"
      subsystem_vendor    = "0x1025"
      uevent              = "DRIVER=i915
PCI_CLASS=30000
PCI_ID=8086:2A42
PCI_SUBSYS_ID=1025:0459
PCI_SLOT_NAME=0000:00:02.0
MODALIAS=pci:v00008086d00002A42sv00001025sd00000459bc03sc00i00"
      vendor              = "0x8086"