E: Could not map GMA950/GMA965 memory

[257]

DMI vendor name: [Apple Inc.]
DMI product name: [MacBook4,1]
System: Linux 3.16.3-gentoo-core2 x86_64
GMA950/GMA965 PCI resource: [/sys/bus/pci/devices/0000:00:02.0/resource0], length 1024K
E: mmap failed: Resource temporarily unavailable
E: Could not map GMA950/GMA965 memory
E: LCD backlight probe failed, check debug output
I: pommed v1.45lw Apple laptops hotkeys handler
I: Copyright (C) 2006-2011 Julien BLACHE jb@jblache.org
pommed configuration:

• General settings:
  fnmode: 1
• sysfs backlight control:
  initial level: -1
  step: 1
  on_batt: 6
• ATI X1600 backlight control:
  initial level: -1
  step: 10
  on_batt: 80
• Intel GMA950 backlight control:
  initial level: 0xffffffff
  step: 0xf
  on_batt: 0x40
• nVidia GeForce 8600M GT backlight control:
  initial level: -1
  step: 1
  on_batt: 6
• Audio volume control:
  card: default
  initial volume: -1
  step: 10%
  beep: yes
  volume element: PCM
  speaker element: Front
  headphones element: Headphone
• Keyboard backlight control:
  default level: 100
  step: 10
  auto on threshold: 20
  auto off threshold: 40
  auto enable: yes
  idle timer: 60s
  idle level: 0
• CD eject:
  enabled: yes
  device: /dev/dvd
• Beep:
  enabled: no
  beepfile: /usr/share/pommed/goutte.wav
• Apple Remote IR Receiver:
  enabled: no
  I: DMI machine check: running on a MacBook4,1

[JKAbrams]

See #8
Could you try my modified gma950_backlight.c?