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[Nils Fenner <nilsfenner@xxxxxx>]

Agree'd. With this patch, screen turns off (not only black).

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https://bugs.launchpad.net/bugs/1455852

Title:
  15.04 will not boot on MacBook 2,1

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  see: http://ubuntuforums.org/showthread.php?t=2274999&p=13286624#post13286624
  Lubuntu 15.04 on refit grub dual boot macbook 2,1 linux-image-3.16 will boot, though
  sometimes hangs but, reboot will work eventually.
  With linux-image-3.19 never,
  ? is the GPU hang reported in kern.log relevant here? i915 problem?
  see kern.log snippet attached
  see error attached from GPU crash dump saved to /sys/class/drm/card0/error

  This seems to be a BUG as suggested by the log:
  "...
  Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel

  
  from:   /sys/class/drm/card0/error:

  
  GPU HANG: ecode -1:0x00000000, reason: Command parser error, iir 0x00008000, action: continue
  Time: 1431810790 s 799079 us
  Kernel: 3.16.0-25-generic
  Reset count: 0
  Suspend count: 0
  PCI ID: 0x27a2
  EIR: 0x00000010
  IER: 0x00028053
  PGTBL_ER: 0x00000102
  FORCEWAKE: 0x00000000
  DERRMR: 0x00000000
  CCID: 0x00000000
  Missed interrupts: 0x00000000
    fence[0] = 00000000
    fence[1] = 00000000
    fence[2] = 00000000
    fence[3] = 00000000
    fence[4] = 00000000
    fence[5] = 00000000
    fence[6] = 00000000
    fence[7] = 00000000
    fence[8] = 00000000
    fence[9] = 00000000
    fence[10] = 00000000
    fence[11] = 00000000
    fence[12] = 00000000
    fence[13] = 00000000
    fence[14] = 00000000
    fence[15] = 00000000
    INSTDONE_0: 0x7fffffc0
    INSTDONE_1: 0x00000000
    INSTDONE_2: 0x00000000
    INSTDONE_3: 0x00000000
  render command stream:
  bsd command stream:
  blt command stream:
  vebox command stream:
  bsd2 command stream:
  Active [0]:
  Pinned [0]:
  Num Pipes: 2
  Pipe [0]:
    Power: on
    SRC: 027f01df
    STAT: 90000a03
  Plane [0]:
    CNTR: 00000000
    STRIDE: 00000000
    SIZE: 00000000
    POS: 00000000
    ADDR: 00000000
  Cursor [0]:
    CNTR: 00000000
    POS: 00000000
    BASE: 00000000
  Pipe [1]:
    Power: on
    SRC: 03ff02ff
    STAT: 10000202
  Plane [1]:
    CNTR: 99000000
    STRIDE: 00001000
    SIZE: 02ff03ff
    POS: 00000000
    ADDR: 00000000
  Cursor [1]:
    CNTR: 00000000
    POS: 00000000
    BASE: 00000000
  CPU transcoder: A
    Power: on
    CONF: 00000000
    HTOTAL: 031f027f
    HBLANK: 03170287
    HSYNC: 02ef028f
    VTOTAL: 020c01df
    VBLANK: 020401e7
    VSYNC: 01eb01e9
  CPU transcoder: B
    Power: on
    CONF: 80000000
    HTOTAL: 059f04ff
    HBLANK: 059f04ff
    HSYNC: 054f052f
    VTOTAL: 0336031f
    VBLANK: 0336031f
    VSYNC: 03280322
  --- 
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bryan      1188 F.... pulseaudio
  CurrentDesktop: LXDE
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=921b491d-af65-4a9e-a51d-47d3c6dcbac2
  InstallationDate: Installed on 2012-10-27 (932 days ago)
  InstallationMedia: Lubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.1)
  MachineType: Apple Inc. MacBook2,1
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=37fab4ad-d609-4d2a-ab4b-5c1a41d2f9fc ro init=/bin/systemd
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.143
  Tags:  vivid
  UdevLog:
   
  Uname: Linux 3.16.0-25-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-04-26 (20 days ago)
  UserGroups: adm cdrom dip lpadmin netdev plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/27/07
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MB21.88Z.00A5.B07.0706270922
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Mac-F4208CAA
  dmi.board.vendor: Apple Inc.
  dmi.board.version: PVT
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-F4208CAA
  dmi.modalias: dmi:bvnAppleInc.:bvrMB21.88Z.00A5.B07.0706270922:bd06/27/07:svnAppleInc.:pnMacBook2,1:pvr1.0:rvnAppleInc.:rnMac-F4208CAA:rvrPVT:cvnAppleInc.:ct10:cvrMac-F4208CAA:
  dmi.product.name: MacBook2,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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