Comment 14 for bug 511965

adding the below to my drivers/video/backlight/mbp_nvidia_bl.c fixed the problem for me on my MacBookPro1,1 after recompiling and inserting the module

 {
  .callback = mbp_dmi_match,
  .ident = "MacBookPro 1,1",
  .matches = {
   DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
   DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro1,1"),
  },
  .driver_data = (void *)&intel_chipset_data,
 },