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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** Tags added: cherry-pick

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https://bugs.launchpad.net/bugs/1171940

Title:
  vgaswitcheroo on the Macbook Pro 8,2

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Hi
  By default when you try and switch graphics card on a Macbook Pro 8,2 from the ATI card to the Intel card , the screen is blanked and never turned on. This is due to the driver not knowing about the LVDS Panel mode since the machine was started with the discrete card on.

  This patch
  http://cgit.freedesktop.org/~mlankhorst/linux/commit/?id=ae7b687c2a57ec50a9d3dde7b0a80a262fdc8c8
  fixes graphics card switching.

  I have applied this patch on the 3.9.1 and 3.8.2 upstream kernels and
  it fixes the issue for me.

  Could this possibly be fixed for S and be SRU'd for Raring?
  ---
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  shadeslayer   2556 F.... pulseaudio
   /dev/snd/controlC0:  shadeslayer   2556 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=f6d8363f-0b01-42c3-b0bd-f859a365fd6c
  InstallationDate: Installed on 2013-03-05 (49 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130304)
  MachineType: Apple Inc. MacBookPro8,2
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB:
   0 inteldrmfb
   1 radeondrmfb
  ProcKernelCmdLine: ro root=/dev/mapper/kubuntu--vg-root  quiet splash  initrd=\initrd.img-3.8.0-17-generic
  ProcVersionSignature: Ubuntu 3.8.0-17.27-generic 3.8.6
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-17-generic N/A
   linux-backports-modules-3.8.0-17-generic  N/A
   linux-firmware                            1.106
  Tags:  raring
  Uname: Linux 3.8.0-17-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-94245A3940C91C80
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-94245A3940C91C80
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,2:pvr1.0:rvnAppleInc.:rnMac-94245A3940C91C80:rvrMacBookPro8,2:cvnAppleInc.:ct10:cvrMac-94245A3940C91C80:
  dmi.product.name: MacBookPro8,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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