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3.15 also reboots without radeon.dpm=0

uname -a
Linux is1 3.15.0-031500rc2-generic #201404201435 SMP Sun Apr 20 18:36:18 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-3.15.0-031500rc2-generic root=UUID=4b852540-b06d-4a34-a9d3-e7bf9b1743c2 ro radeon.dpm=0

because kubuntu 12.10 works ok on that pc I also tried 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12.18-trusty/

that one works without radeon.dpm=0:
uname -a
Linux is1 3.12.18-031218-generic #201404232135 SMP Thu Apr 24 01:36:18 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-3.12.18-031218-generic root=UUID=4b852540-b06d-4a34-a9d3-e7bf9b1743c2 ro

need to bring the PC to its owner today, so more tests are difficult to
do for me, sorry

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https://bugs.launchpad.net/bugs/1312593

Title:
  kernel reboots without radeon.dpm=0 cmd line

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  As requested by christopher.m.penalver@xxxxxxxxx in 
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1309578/comments/45
  I reported bug again with ubuntu-bug linux

  PC with same hardware booted Kubuntu 12.04 migrated by rsync without problems.
  After upgrade to Kubuntu 12.10 booted also without problems.

  Upgrade from 12.10 to 13.10 did not work so I installed 14.04 new.

  Install 14.04 from USB-Stick rebooted after a few seconds. If I do nothing or select install and try everytime after a few seconds reboots.
  After adding radeon.dpm=0 to bootline install works fine.
  First boot of installed kubuntu 14.04 reboots again after a few seconds.
  Adding radeon.dpm=0 to bootline system boots fine.
  Now added radeon.dpm=0 to /etc/default/grub:GRUB_CMDLINE_LINUX_DEFAULT and works fine, send ubuntu-bug linux from that PC with that CMDLINE.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46 [modified: boot/vmlinuz-3.13.0-24-generic]
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/pcmC1D2c', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Fri Apr 25 10:20:10 2014
  HibernationDevice: RESUME=UUID=c1528747-83a6-4306-af82-f3951aab09c4
  InstallationDate: Installed on 2014-04-24 (0 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: ARLT Computer Produkte GmbH Mr. Office VIII R3 (3080442C)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=4b852540-b06d-4a34-a9d3-e7bf9b1743c2 ro radeon.dpm=0
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V30.2
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: A78M-E35 (MS-7721)
  dmi.board.vendor: MSI
  dmi.board.version: 6.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 6.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV30.2:bd02/21/2014:svnARLTComputerProdukteGmbH:pnMr.OfficeVIIIR3(3080442C):pvr6.0:rvnMSI:rnA78M-E35(MS-7721):rvr6.0:cvnMSI:ct3:cvr6.0:
  dmi.product.name: Mr. Office VIII R3 (3080442C)
  dmi.product.version: 6.0
  dmi.sys.vendor: ARLT Computer Produkte GmbH
  --- 
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-04-24 (1 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  Tags:  trusty
  Uname: Linux 3.15.0-031500rc2-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True

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