Quantal-alpha boot on iMac 5,1 requires acpi=off

Bug #1034338 reported by Kevin Donnelly on 2012-08-08
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

The 12.10 alpha 3 amd+mac iso from http://cdimage.ubuntu.com/releases/12.10/alpha-3/ will not boot.

WORKAROUND: Use kernel parameter:

At the man+keyboard screen, press any key and accept English, then press F6, then move to acpi=off and press Space to select it, and Esc. Then press Return to allow the LiveCD to boot, which takes about 3 minutes.

This is on an iMac 5,1, Core 2 Duo, 3Gb RAM, ATI Radeon.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: linux-image-3.5.0-6-generic 3.5.0-6.6
ProcVersionSignature: Ubuntu 3.5.0-6.6-generic 3.5.0
Uname: Linux 3.5.0-6-generic x86_64

ApportVersion: 2.4-0ubuntu5
Architecture: amd64
 /dev/snd/controlC0: ubuntu 3248 F.... pulseaudio
CasperVersion: 1.320
Date: Wed Aug 8 11:08:52 2012
 eth0 no wireless extensions.

 lo no wireless extensions.
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64+mac (20120724.2)
MachineType: Apple Computer, Inc. iMac5,1
 PATH=(custom, no user)
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet splash -- acpi=off
 linux-restricted-modules-3.5.0-6-generic N/A
 linux-backports-modules-3.5.0-6-generic N/A
 linux-firmware 1.85
 0: hci0: Bluetooth
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/27/07
dmi.bios.vendor: Apple Computer, Inc.
dmi.bios.version: IM51.88Z.0090.B09.0706270921
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Mac-F4228EC8
dmi.board.vendor: Apple Computer, Inc.
dmi.board.version: DVT
dmi.chassis.asset.tag: Asset Tag
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Computer, Inc.
dmi.chassis.version: Mac-F4228EC8
dmi.modalias: dmi:bvnAppleComputer,Inc.:bvrIM51.88Z.0090.B09.0706270921:bd06/27/07:svnAppleComputer,Inc.:pniMac5,1:pvr1.0:rvnAppleComputer,Inc.:rnMac-F4228EC8:rvrDVT:cvnAppleComputer,Inc.:ct13:cvrMac-F4228EC8:
dmi.product.name: iMac5,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Computer, Inc.

Kevin Donnelly (donnek) wrote :
Brad Figg (brad-figg) on 2012-08-08
Changed in linux (Ubuntu):
status: New → Confirmed
Howard Chan (smartboyhw) wrote :

Suggested importance: Undecided -> Critical.
Reason: This is a serious issue and will affect many people installing or using Ubuntu on Mac.

Joseph Salisbury (jsalisbury) wrote :

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.5kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages.

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. Please only remove that one tag and leave the other tags. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6-rc1-quantal/

Changed in linux (Ubuntu):
importance: Undecided → Medium
tags: added: needs-upstream-testing
Changed in linux (Ubuntu):
status: Confirmed → Incomplete
Kevin Donnelly (donnek) wrote :

Joseph, I haven't actually installed 12.10a3 on the iMac yet, though I may do that in the next couple of days. Don't I need to have it installed in order to install the latest kernel? My testing so far was only on the LiveCD boot, which boots on 12.10 with acpi=off, but didn't boot at all with 12.04 release version.

Dimitri John Ledkov (xnox) wrote :

As per comment 4, setting kernel-unable-to-test-upstream as it is unreasonable to respin daily CD with mainline kernel....

Changed in linux (Ubuntu):
status: Incomplete → Confirmed
tags: added: kernel-unable-to-test-upstream
removed: needs-upstream-testing
Joseph Salisbury (jsalisbury) wrote :


It is possible to install the latest mainline kernel[0] on a precise or quantal installation. To do so, Download the test kernel .deb files(both linux-image and linux-image-extra).

Then you can install it with:
sudo dpkg -i packagename.deb

A reboot is then required to boot into the new kernel.

After power-on, you can hold the shift key to access the GRUB2 menu. From there you can select which kernel to boot. Once tested, you can remove the mainline kernel with sudo dpkg -r kernel-package-name

Changed in linux (Ubuntu):
status: Confirmed → Incomplete
importance: Medium → High
tags: added: kernel-da-key
Kevin Donnelly (donnek) wrote :

Yes, thanks for that, but what I mean is that upgrading the kernel on an installed 12.10 will not directly test the iso booting issue unless there is a way to regenerate a new iso with the upgraded kernel - see #5.

Changed in linux (Ubuntu):
status: Incomplete → Confirmed

Kevin Donnelly, thank you for your comments. Did this issue not occur in a release prior to Quantal? As well, could you please install Ubuntu Quantal, fully update, and comment if the WORKAROUND is still required?

Thank you for your understanding.

description: updated
Changed in linux (Ubuntu):
status: Confirmed → Incomplete
Launchpad Janitor (janitor) wrote :

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

Changed in linux (Ubuntu):
status: Incomplete → Expired
To post a comment you must log in.
This report contains Public information  Edit
Everyone can see this information.

Other bug subscribers