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["Jason R. Coombs" <jaraco@xxxxxxxxxx>]

It seems the instructions at
https://help.ubuntu.com/community/MacBookAir3-2/Narwhal describe how to
work around this issue.

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https://bugs.launchpad.net/bugs/746174

Title:
  Screen corruption on Macbook Air (Nvidia 320M)

Status in Mactel Support:
  New
Status in NVIDIA Drivers Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  Confirmed
Status in “nouveau-kernel-source” package in Fedora:
  Unknown

Bug description:
  Binary package hint: xorg

  I just got a Macbook Air and tried to install Ubuntu on it.  Booting
  up the main install disk resulted in some crazy screen corruption, and
  the left inch and a half or so was completely useless, since it did
  not appear to update other than randomly moving bits (described
  below).

  It is hard to describe.  It looked as if I had a normal desktop, but
  overlayed on top of it was a series of 3cm vertical 'bands'.  There
  was a staircasing effect between bands, as a small horizontal line
  connected them but fell between successive bands.  On top of all this,
  pixels seemed to 'move' awkwardly, like they were dancing around after
  too many beers.  If I had to guess, I would say my video card and
  display device disagreed on the resolution, and on top of that
  somebody Snow Crashed my desktop.

  Switching back to the console via ctrl-alt-f1 does not fix the
  problem; my console was messed up in similar ways, though it looks
  more like just plain Snow Crash then.  There was no color in the
  console, of course, so I guess it just must be hard to see any banding
  artifacts, even if they are still there.

  I guess is the wrong place to mention it, but as a side note: the xorg
  folks semi-recently made "DontZap" the default, i.e. disabled ctrl-
  alt-backspace.  Please make it the default on Ubuntu, it's a real pain
  to debug this kind of thing when you can't kill X.

  The fix is simple: remove "quiet splash" from the grub boot lines.
  Everything works then -- with both the nvidia proprietary drivers and
  nouveau.

  It might be important to note that my screen seemed fine until X
  started up, so it seems to be some poor interaction between the splash
  screen (I guess) and X's KMS?

  This is 10.10, maverick.  I didn't try an update after installing from
  the CD, because it was too difficult to see what I was typing.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: xorg 1:7.5+6ubuntu3
  ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
  Uname: Linux 2.6.35-28-generic x86_64
  NonfreeKernelModules: nvidia wl
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  260.19.06  Mon Sep 13 04:29:19 PDT 2010
   GCC version:  gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)
  Architecture: amd64
  Date: Wed Mar 30 19:54:28 2011
  DkmsStatus:
   bcmwl, 5.60.48.36+bdcom, 2.6.35-28-generic, x86_64: installed 
   bcmwl, 5.60.48.36+bdcom, 2.6.35-22-generic, x86_64: installed 
   nvidia-current, 260.19.06, 2.6.35-28-generic, x86_64: installed 
   nvidia-current, 260.19.06, 2.6.35-22-generic, x86_64: installed
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Apple Inc. MacBookAir3,1
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-28-generic root=UUID=f2123c85-84bb-45ca-93f3-61e22edb3523 ro
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  dmi.bios.date: 11/18/10
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA31.88Z.0061.B01.1011181342
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-942452F5819B1C1B
  dmi.board.vendor: Apple Inc.
  dmi.board.version: 1.0
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-942452F5819B1C1B
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA31.88Z.0061.B01.1011181342:bd11/18/10:svnAppleInc.:pnMacBookAir3,1:pvr1.0:rvnAppleInc.:rnMac-942452F5819B1C1B:rvr1.0:cvnAppleInc.:ct10:cvrMac-942452F5819B1C1B:
  dmi.product.name: MacBookAir3,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  system:
   distro:             Ubuntu
   codename:           maverick
   architecture:       x86_64
   kernel:             2.6.35-28-generic

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