Public bug reported:

My setup is as follows:
 * MacBook Pro 5,3, and the NVidia 9600M GT seems to be selected by default by 
Linux and X.
 * Installed Ubuntu 11.04 (64-bit) Desktop Edition to a USB stick, without 
persistent storage (to be as closely related to the CD as possible)
 * Booting using rEFIt into the EFI side of Ubuntu.
 * I have not attempted any other setups. Many a GRUB2 boot option has been 
tried.

I've tried nouveau.modeset=0, nouveau.noaccel=1, nomodeset, video=efifb,
acpi=force, with or without "quiet splash". Sometimes I'd get odd
results that would repeat, and I realized that my video card's state was
actually not getting cleared between reboots, so I needed to do a cold
boot for each test.

I think you guys will find that last bit *extremely* important for bug
testing. If you review some of the older nouveau bugs involving
MacBooks, you might find that some people managed to get something
working, but just for one boot. It's my understanding so far that these
people may not have been doing cold boots to do their testing, and were
accumulating states that somehow managed to get it to work at times. I
managed the same thing, and at first thought nouveau.noaccel=1 works.
Turns out, that's not the case.

Now I think I've got it. I need to do a few more tests to confirm this
is consistent. I had the integrated video card turned on in OSX, because
it saves battery life. While this option was selected, all my efforts
did not succeed. When I rebooted back into OSX, and selected the
discrete card, and then rebooted back to Linux, I got in just fine with
nouveau.noaccel=1.

I'm going to test to make sure switching the graphics cards actually
makes a difference, and then after see if noaccel also makes a
difference.

Whether or not I found a work-around, this bug exists and should be
fixed. If there's any way I can help let me know.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-8-generic 2.6.38-8.42
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: NVidia [HDA NVidia], device 0: Cirrus Analog [Cirrus Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xe7480000 irq 20'
   Mixer name   : 'Cirrus Logic CS4206'
   Components   : 'HDA:10134206,106b4b00,00100301'
   Controls      : 17
   Simple ctrls  : 10
Date: Mon May 23 15:58:30 2011
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: Apple Inc. MacBookPro5,3
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/hostname.seed 
boot=casper quiet splash nouveau.noaccel=1 --
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic  N/A
 linux-firmware                            1.52
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/15/09
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP53.88Z.00AC.B03.0906151647
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-F22587C8
dmi.board.vendor: Apple Inc.
dmi.chassis.asset.tag: Asset Tag#
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F22587C8
dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP53.88Z.00AC.B03.0906151647:bd06/15/09:svnAppleInc.:pnMacBookPro5,3:pvr1.0:rvnAppleInc.:rnMac-F22587C8:rvr:cvnAppleInc.:ct10:cvrMac-F22587C8:
dmi.product.name: MacBookPro5,3
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug natty

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https://bugs.launchpad.net/bugs/787071

Title:
  nouveau kernel driver corrupts display on MacBook Pro 5,3 9600M GT

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