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[madbiologist <1071622@xxxxxxxxxxxxxxxxxx>]

I had this problem in Precise and Quantal but it is fixed for me in
Raring.  Can you try Ubuntu 13.04 "Raring Ringtail" and let us know if
it is fixed for you?

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https://bugs.launchpad.net/bugs/1071622

Title:
  [radeon] System crashes and restarts during video playback

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Situation:
  When I trying to watch video it's often end up in a system restart. I have 3 video players in my system: mplayer2/mplayer, Totem and VLC. I never confirmed this with Totem because it's video playback very slow and I just can not resist it. However mplayer and VLC with xv output is fast on my system and that's where problems appears. This bug isn't 100% reproducible and doesn't happen on all videos but if it crashes on some specific video then it keeps crashing on it again and again. So, it is reproducible. Also it happens both in mplayer and VLC, so it isn't player-specific.
  In Ubuntu 12.04 I was able to set 'sdl' output and it fixed my problem (at least it didn't restart without jumping between fullscreen and window modes, it still crashed sometimes but very rarely) but in Ubuntu 12.10 it became very slow and doesn't help against this issue (system crashes).

  However in Ubuntu 12.10 GnomeShell works good enough for me and
  surprisingly this bug doesn't reproduce there. That's actually why I
  decided to report it on Compiz. I doubt it's problem with Unity but
  very likely it's problem with Compiz since GnomeShell does not use it
  and video playback does not cause system restart there.

  My system configuration:
  * Ubuntu 12.10
  * ATI Radeon HD 3200
  * Open-source graphics driver (closed-source one does not supports my videocard anymore).

  Please tell me how could I help to diagnose this crash. I really like Unity and want to keep using it but with this problem I simply can't. :(
  --- 
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lainverse   4804 F.... pulseaudio
   /dev/snd/controlC0:  lainverse   4804 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  DistroRelease: Ubuntu 12.10
  HibernationDevice: RESUME=UUID=631b09fa-303c-4ada-b470-5d75e8e44759
  InstallationDate: Installed on 2011-04-29 (546 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  IwConfig:
   eth0      no wireless extensions.
   
   eth1      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. GA-MA78GM-S2H
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=0a223b13-cdf3-43cf-9642-8d8aa125dce3 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-18-generic N/A
   linux-backports-modules-3.5.0-18-generic  N/A
   linux-firmware                            1.95
  RfKill:
   
  Tags:  quantal
  Uname: Linux 3.5.0-18-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2012-10-18 (7 days ago)
  UserGroups: adm admin audio cdrom dialout lpadmin plugdev sambashare video
  dmi.bios.date: 04/30/2008
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F4
  dmi.board.name: GA-MA78GM-S2H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd04/30/2008:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA78GM-S2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA78GM-S2H:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-MA78GM-S2H
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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