Screen lit off on iMac 12,2 after a while

[Étienne BERSAC]

Hello,

I'm running Ubuntu on an iMac 12,2 since november 2012. From time to time and more and more frequently the screen lit off. The only way i can get it on is to suspend/resume. But then, it lit off soon. I suspect some heating. Actually, the output of the cooling system is way hotter with Ubuntu than Mac OS X.

So i would like to switch to the IGD card rather than the discrete one. But there is no vga_switcheroo.

How to debug screen lit off ? How to detect screen heating ? How to disable discrete card ? Is it kernel ? Xorg ? Where to search ?

Regards,
Étienne

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-15-generic 3.19.0-15.15 [modified: boot/vmlinuz-3.19.0-15-generic]
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: bersace 1709 F.... pulseaudio
                      gdm 28946 F.... pulseaudio
 /dev/snd/controlC0: bersace 1709 F.... pulseaudio
                      gdm 28946 F.... pulseaudio
CRDA:
 country AW: DFS-UNSET
  (2402 - 2482 @ 40), (N/A, 20), (N/A)
  (5170 - 5250 @ 40), (N/A, 20), (N/A)
  (5250 - 5330 @ 40), (N/A, 20), (0 ms), DFS
  (5490 - 5710 @ 40), (N/A, 27), (0 ms), DFS
Date: Thu May 7 20:51:33 2015
HibernationDevice: RESUME=UUID=a842b955-b20e-4514-af83-7b6f45dc1000
InstallationDate: Installed on 2015-04-29 (8 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: Apple Inc. iMac12,2
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcFB:
 0 inteldrmfb
 1 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic.efi.signed root=UUID=6f639d83-47c9-41fb-aa9b-c3931e37acc5 ro rootflags=subvol=@ quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-15-generic N/A
 linux-backports-modules-3.19.0-15-generic N/A
 linux-firmware 1.143
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/24/12
dmi.bios.vendor: Apple Inc.
dmi.bios.version: IM121.88Z.0047.B1F.1201241648
dmi.board.name: Mac-942B59F58194171B
dmi.board.vendor: Apple Inc.
dmi.board.version: iMac12,2
dmi.chassis.type: 13
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-942B59F58194171B
dmi.modalias: dmi:bvnAppleInc.:bvrIM121.88Z.0047.B1F.1201241648:bd01/24/12:svnAppleInc.:pniMac12,2:pvr1.0:rvnAppleInc.:rnMac-942B59F58194171B:rvriMac12,2:cvnAppleInc.:ct13:cvrMac-942B59F58194171B:
dmi.product.name: iMac12,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[penalvch (penalvch)]

Étienne BERSAC, thank you for reporting this and helping make Ubuntu better. Could you please test the latest upstream kernel available from the very top line at the top of the page (the release names are irrelevant for testing, and please do not test the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue.

If the test did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where XY and Z are numbers corresponding to the kernel version.

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results.

[Étienne BERSAC (bersace)]

I'll check this out. Thanks !!

Note that i never reproduced this on Mac OS X. This is why i think it's not an hardware issue.

[Étienne BERSAC (bersace)]

Finally, i reproduce it with `4.1.0-040100rc2-generic`.

[Étienne BERSAC (bersace)]

I don't know why it took so much time to trigger. I did not a particularily long session : less than 1 hour.

[penalvch (penalvch)]

Étienne BERSAC, the latest mainline kernel is 4.1.1 (not 4.1-rc2).

[Étienne BERSAC (bersace)]

Ok, I'm checking it in.

It triggers today too after less than 15min. We have summer heat. It's 30°C here near the Mac.

Thank you very much for your attention ! :)

[penalvch (penalvch)]

Étienne BERSAC, as per https://support.apple.com/en-us/HT201518 an update to your computer's buggy and outdated BIOS is available (IM121.0047.B21). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?

If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette .

Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. Also, you don't have to create a new bug report.

Once the BIOS is updated, and the information above is provided, then please mark this report Status Confirmed.

Thank you for your understanding.

[Étienne BERSAC (bersace)]

Thanks for pointing it. I'll check this out asap.

[Launchpad Janitor (janitor)]

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