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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

apport-collect 1341078

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.

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

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1341078

Title:
  Video randomly freezes. drivers/gpu/drm/drm_crtc.c

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  this bug appears randomly. i dont know what triggers this bug or to
  witch packet it belongs. when i get this error, everythin freezes,
  only mouse is moving. im using GNOME Shell 3.10.4. dmesg shows:

  [ 7682.516666] ------------[ cut here ]------------
  [ 7682.516713] WARNING: CPU: 1 PID: 1140 at /build/buildd/linux-3.13.0/drivers/gpu/drm/drm_crtc.c:2097 drm_mode_set_config_internal+0xd6/0xe0 [drm]()
  [ 7682.516774] Modules linked in: ctr ccm pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) snd_hda_codec_realtek snd_hda_codec_hdmi bnep rfcomm binfmt_misc hid_generic usbhid hid uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev nls_iso8859_1 kvm_amd kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul ath3k glue_helper ablk_helper btusb cryptd bluetooth joydev serio_raw snd_hda_intel snd_hda_codec snd_hwdep snd_pcm arc4 snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi ath9k ath9k_common ath9k_hw snd_seq ath snd_seq_device mac80211 snd_timer snd cfg80211 k10temp i2c_piix4 radeon ttm drm_kms_helper soundcore drm i2c_algo_bit wmi video mac_hid parport_pc ppdev lp parport psmouse ahci libahci r8169 mii
  [ 7682.516779] CPU: 1 PID: 1140 Comm: Xorg Tainted: GF          O 3.13.0-30-generic #54-Ubuntu
  [ 7682.516781] Hardware name: SAMSUNG ELECTRONICS CO., LTD. 535U3C/NP535U3C-A01EE, BIOS P07RAS.W73.130411.LEO 04/11/2013
  [ 7682.516787]  0000000000000009 ffff8800874efab0 ffffffff8171a324 0000000000000000
  [ 7682.516791]  ffff8800874efae8 ffffffff810676bd ffff880139e310a0 0000000000000000
  [ 7682.516795]  ffff880095301000 ffff88009454c060 0000000000000080 ffff8800874efaf8
  [ 7682.516796] Call Trace:
  [ 7682.516808]  [<ffffffff8171a324>] dump_stack+0x45/0x56
  [ 7682.516814]  [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0
  [ 7682.516819]  [<ffffffff8106779a>] warn_slowpath_null+0x1a/0x20
  [ 7682.516846]  [<ffffffffa0094f36>] drm_mode_set_config_internal+0xd6/0xe0 [drm]
  [ 7682.516860]  [<ffffffffa00eff41>] drm_fb_helper_set_par+0x71/0xf0 [drm_kms_helper]
  [ 7682.516867]  [<ffffffff813c77c1>] fb_set_var+0x191/0x430
  [ 7682.516873]  [<ffffffff810a2ce0>] ? update_curr+0x80/0x180
  [ 7682.516880]  [<ffffffff813d47a1>] fbcon_blank+0x1d1/0x2d0
  [ 7682.516885]  [<ffffffff8109814d>] ? ttwu_do_activate.constprop.74+0x5d/0x70
  [ 7682.516892]  [<ffffffff8145cdb8>] do_unblank_screen+0xb8/0x1f0
  [ 7682.516897]  [<ffffffff81452b1a>] complete_change_console+0x5a/0xe0
  [ 7682.516901]  [<ffffffff81453b4a>] vt_ioctl+0xfaa/0x11c0
  [ 7682.516906]  [<ffffffff811dc384>] ? mntput+0x24/0x40
  [ 7682.516911]  [<ffffffff8144758d>] tty_ioctl+0x26d/0xbb0
  [ 7682.516918]  [<ffffffff811cfa20>] do_vfs_ioctl+0x2e0/0x4c0
  [ 7682.516921]  [<ffffffff8109dd94>] ? vtime_account_user+0x54/0x60
  [ 7682.516927]  [<ffffffff811cfc81>] SyS_ioctl+0x81/0xa0
  [ 7682.516932]  [<ffffffff8172aeff>] tracesys+0xe1/0xe6
  [ 7682.516935] ---[ end trace 54f89ecfaa291f44 ]---

  lspci -v | grep VGA
  00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7500G] (prog-if 00 [VGA controller])

  sudo lshw -c video

    *-display               
         description: VGA compatible controller
         product: Trinity [Radeon HD 7500G]
         vendor: Advanced Micro Devices, Inc. [AMD/ATI]
         physical id: 1
         bus info: pci@0000:00:01.0
         version: 00
         width: 32 bits
         clock: 33MHz
         capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
         configuration: driver=radeon latency=0
         resources: irq:44 memory:c0000000-cfffffff ioport:f000(size=256) memory:feb00000-feb3ffff

  lsb_release -rd

  Description:	Ubuntu 14.04 LTS
  Release:	14.04

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