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[Étienne BERSAC <bersace03@xxxxxxxxx>]

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


** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1452858

Title:
  Screen lit off on iMac 12,2 after a while

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  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.

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