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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

ATAKAMA, could you please execute the following command via a terminal (not attach the file manually):
apport-collect 1404560

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https://bugs.launchpad.net/bugs/1404560

Title:
  Trusty kernel is unable to page Evergreen Radeon GPU; blank screen and
  high load after boot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  apt-cache policy linux-signed-generic
  linux-signed-generic:
    Installed: 3.13.0.43.50
    Candidate: 3.13.0.43.50
    Version table:
   *** 3.13.0.43.50 0
          500 http://ro.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
          100 /var/lib/dpkg/status
       3.13.0.24.28 0
          500 http://ro.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  Expected behavior: see lightdm login screen after boot

  Actual behavior:
  After a kernel update to 3.13.0-43, a machine with an Evergreen Radeon GPU is no longer usable. After showing the splash screen, the monitor doesn't detect any signal and goes blank. Furthermore, the system load increases above 2.5 without any CPU or IO activity.
  This bug is similar to bug #1397553 for Utopic.

  EDIT: The bug only surfaces when a monitor is connected via HDMI. If
  the HDMI connector is unplugged, the system boots fine.

  Relevant syslog:

  [    0.000000] Linux version 3.13.0-43-generic (buildd@tipua) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #72-Ubuntu SMP Mon Dec 8 19:35:06 UTC 2014 (Ubuntu 3.13.0-43.72-generic 3.13.11.11)
  [   32.934494] BUG: unable to handle kernel paging request at ffffec2000000900
  [   32.934592] IP: [<ffffffff811a2046>] kfree+0x56/0x140
  [   32.934655] PGD 0
  [   32.934683] Oops: 0000 [#1] SMP
  [   32.934726] Modules linked in: bnep rfcomm snd_hda_codec_realtek snd_hda_codec_hdmi hid_generic snd_hda_intel usbhid kvm_amd hid snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi kvm snd_seq snd_seq_device snd_timer radeon serio_raw snd btusb soundcore ttm drm_kms_helper k10temp bluetooth sp5100_tco drm i2c_algo_bit i2c_piix4 mac_hid parport_pc ppdev f71882fg lp parport nls_iso8859_1 pata_acpi psmouse r8169 mii pata_atiixp ahci libahci
  [   32.935304] CPU: 0 PID: 1523 Comm: Xorg Not tainted 3.13.0-43-generic #72-Ubuntu
  [   32.935384] Hardware name: MSI MS-7698/E350IA-E44 (MS-7698), BIOS V1.5 04/22/2011
  [   32.935458] task: ffff880232b3c800 ti: ffff880232b34000 task.ti: ffff880232b34000
  [   32.935532] RIP: 0010:[<ffffffff811a2046>]  [<ffffffff811a2046>] kfree+0x56/0x140
  [   32.935612] RSP: 0018:ffff880232b35a68  EFLAGS: 00010286
  [   32.935669] RAX: ffffec2000000900 RBX: 0000100000024414 RCX: 0000000000000000
  [   32.935739] RDX: ffffea0000000000 RSI: 0000000000005f78 RDI: 0000100000024414
  [   32.935809] RBP: ffff880232b35a80 R08: 0000000000000022 R09: 0000000000000021
  [   32.935879] R10: ffffea0008ca1dc0 R11: ffffffffa0292bc1 R12: 0000000000000000
  [   32.935949] R13: ffffffffa02ef3b6 R14: 0000000000000000 R15: ffff880231c95e00
  [   32.936021] FS:  00007f47050109c0(0000) GS:ffff88023ec00000(0000) knlGS:0000000000000000
  [   32.936106] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   32.936163] CR2: ffffec2000000900 CR3: 0000000231123000 CR4: 00000000000007f0
  [   32.936234] Stack:
  [   32.936257]  ffff880036784000 0000000000000000 ffff880036784000 ffff880232b35b38
  [   32.936345]  ffffffffa02ef3b6 ffff880232b35ab0 ffff880200007048 000070440000712c
  [   32.936431]  ffff880001f7d000 0000100000024414 0000188000024414 0000180000028488
  [   32.936518] Call Trace:
  [   32.936605]  [<ffffffffa02ef3b6>] evergreen_hdmi_setmode+0x776/0x960 [radeon]
  [   32.936707]  [<ffffffffa00bb55e>] ? drm_detect_hdmi_monitor+0x6e/0xb0 [drm]
  [   32.936814]  [<ffffffffa02f6788>] radeon_atom_encoder_mode_set+0x158/0x2d0 [radeon]
  [   32.936897]  [<ffffffffa0150a98>] drm_crtc_helper_set_mode+0x498/0x500 [drm_kms_helper]
  [   32.937004]  [<ffffffffa02a0d35>] radeon_property_change_mode.isra.1+0x35/0x40 [radeon]
  [   32.937109]  [<ffffffffa02a0ece>] radeon_connector_set_property+0x18e/0x300 [radeon]
  [   32.937209]  [<ffffffffa00b8732>] drm_mode_obj_set_property_ioctl+0x142/0x340 [drm]
  [   32.937300]  [<ffffffffa00b8960>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
  [   32.937391]  [<ffffffffa00a7c22>] drm_ioctl+0x502/0x630 [drm]
  [   32.937456]  [<ffffffff8172cc94>] ? __do_page_fault+0x204/0x560
  [   32.937534]  [<ffffffffa02620fe>] radeon_drm_ioctl+0x4e/0x90 [radeon]
  [   32.937602]  [<ffffffff811d0e90>] do_vfs_ioctl+0x2e0/0x4c0
  [   32.937664]  [<ffffffff811c01b1>] ? __sb_end_write+0x31/0x60
  [   32.937727]  [<ffffffff811d10f1>] SyS_ioctl+0x81/0xa0
  [   32.937781]  [<ffffffff817316ad>] system_call_fastpath+0x1a/0x1f
  [   32.937844] Code: 00 00 00 80 ff 77 00 00 48 01 d8 48 0f 42 15 e2 2f a7 00 48 01 d0 48 ba 00 00 00 00 00 ea ff ff 48 c1 e8 0c 48 c1 e0 06 48 01 d0 <48> 8b 10 80 e6 80 0f 85 be 00 00 00 49 89 c2 49 8b 02 a8 80 0f
  [   32.938231] RIP  [<ffffffff811a2046>] kfree+0x56/0x140
  [   32.938293]  RSP <ffff880232b35a68>
  [   32.938330] CR2: ffffec2000000900

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