[iMac17,1] Not booting with ACPI enabled

[tedaste]

With a 27in 5k ( new as of two weeks ago) I'm unable to boot. The applies to both the live installer and a system installed on disk. I just get a blank screen. It gives a blank screen event if the "quiet" is removed from the kernel parameters. The system has a 250G SSD. I'm using the Kubutu live installer for Wily off a USB stick.

WORKAROUND: Use kernel parameters:
acpi=off nomodeset

---
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: KDE
DistroRelease: Ubuntu 15.10
InstallationDate: Installed on 2015-12-08 (9 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
Package: linux (not installed)
Tags: wily
Uname: Linux 4.4.0-040400rc5-generic x86_64
UnreportableReason: The running kernel is not an Ubuntu kernel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
---
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: toivo 1330 F.... pulseaudio
 /dev/snd/controlC1: toivo 1330 F.... pulseaudio
DistroRelease: Ubuntu 15.10
InstallationDate: Installed on 2015-12-08 (14 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Apple Inc. iMac17,1
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=en_AU:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/usr/bin/zsh
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-21-generic.efi.signed root=UUID=0751bb9a-8e2b-439a-aca9-e29cf2dadb77 ro persistent acpi=off nomodeset
ProcVersionSignature: Ubuntu 4.2.0-21.25-generic 4.2.6
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-21-generic N/A
 linux-backports-modules-4.2.0-21-generic N/A
 linux-firmware 1.149.3
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
Tags: wily
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.2.0-21-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

_MarkForUpload: True
dmi.bios.date: 10/09/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM171.88Z.0105.B04.1510091442
dmi.board.name: Mac-65CE76090165799A
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac17,1
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-65CE76090165799A
dmi.modalias: dmi:bvnAppleInc.:bvrIM171.88Z.0105.B04.1510091442:bd10/09/2015:svnAppleInc.:pniMac17,1:pvr1.0:rvnAppleInc.:rnMac-65CE76090165799A:rvriMac17,1:cvnAppleInc.:ct9:cvrMac-65CE76090165799A:
dmi.product.name: iMac17,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1525615/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[tedaste (toivo-arach)]

When I tried "apc=force" I got a couple of lines on the screen, ending with Loading initial ramdisk

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1525615

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.4 kernel[0].

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'.

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/v4.4-rc5-wily

[Tyberius Prime (tyberius-prime)]

I'm running into the same issue. Tried Kernel 4.4-rc5, would also not boot without acpi=off and nomodeset.

After booting with those two parameters, the GUI is very sluggish, animations take on the order of seconds.

Also lost mouse and keyboard (wireless) functionality when upgrading - possibly unrelated.

[Tyberius Prime (tyberius-prime)]

acpi = ht does not work. 14.04 and 13.04 won't boot without acpi=off either.

[tedaste (toivo-arach)]

When I tried the latest 4.4 it didn't work. When I included 'nomodeset' it got to "loading initial ramdisk" and stopped.

When you boot with acpi=false the GUI is slow because it's using the Vesa driver

[tedaste (toivo-arach)]

apport information

[tedaste (toivo-arach)]

apport information

[penalvch (penalvch)]

tedaste, to see if this is already resolved in Ubuntu, could you please test http://cdimage.ubuntu.com/daily-live/current/ and advise to the results?

[tedaste (toivo-arach)]

I tried the daily-live, still the same problem

[penalvch (penalvch)]

tedaste, using the default Ubuntu kernel (not 3rd party), could you please utilize your WORKAROUNDs, boot into a working system, and then execute the following via a terminal as it will attach necessary debugging information:
apport-collect 1525615

[tedaste (toivo-arach)]

apport information

[tedaste (toivo-arach)]

apport information

[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

apport information

[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

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[tedaste (toivo-arach)]

apport information

[tedaste (toivo-arach)]

OK done

[penalvch (penalvch)]

tedaste, could you please test the latest mainline kernel (4.4-rc6) and advise to the results?

[tedaste (toivo-arach)]

Still stops at Loading Initial ramdisk

[penalvch (penalvch)]

tedaste, to clarify, if you use just acpi=off, without nomodeset, are you able to boot into a working system?

[tedaste (toivo-arach)]

Without nomodeset it does boot to a working system (I can ping it) however the last thing you see on the screen is

Switching to radeondrmfb

[penalvch (penalvch)]

tedaste, this would appear a two part problem (acpi and graphics), but let the initial focus be on the first issue of not able to boot up at all without acpi-off. Hence, the issue you are reporting is an upstream one. Could you please report this problem following the instructions verbatim at https://wiki.ubuntu.com/Bugs/Upstream/kernel to the appropriate mailing list (TO Rafael J. Wysocki, and Len Brown, CC linux-acpi)?

Please provide a direct URL to your post to the mailing list when it becomes available so that it may be tracked.

Thank you for your understanding.

[tedaste (toivo-arach)]

The fix is to use the kernel parameter nointremap (thanks Daniel Larouche).

It boots with all the hardware enabled.