kernel-packages team mailing list archive

[Maarten Fonville <1402172@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When applying the updates on my Ubuntu Utopic installation I received the new 3.16.0-28 kernel.
The computer had no problems with the Utopic kernels before ( up to 3.16.0-26), but now it suddenly won't give any output (via HDMI) when booting. I don't get X, I don't get a splah and I can't switch with ctrl+alt+fX to one of the terminals.

When booting with the older kernels or the latest (3.18.0) kernel from
http://kernel.ubuntu.com/~kernel-ppa/mainline/ no problem appears. I
also reinstalled the 3.16.0-28 kernel image and reran update-initramfs,
but the problem stays. So something explicitly in this kernel is
creating this issue.


Below I paste the relevant messages i found in the dmesg/syslog:

Dec 11 21:49:14 tolnedra kernel: [  240.144267] INFO: task kworker/0:0:4 blocked for more than 120 seconds.
Dec 11 21:49:14 tolnedra kernel: [  240.144419]       Not tainted 3.16.0-28-generic #37-Ubuntu
Dec 11 21:49:14 tolnedra kernel: [  240.144526] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 11 21:49:14 tolnedra kernel: [  240.144677] kworker/0:0     D ffff88014ec13840     0     4      2 0x00000000
Dec 11 21:49:14 tolnedra kernel: [  240.144889] Workqueue: events output_poll_execute [drm_kms_helper]
Dec 11 21:49:14 tolnedra kernel: [  240.145011]  ffff88014915bd40 0000000000000046 ffff8801490c9e90 0000000000013840
Dec 11 21:49:14 tolnedra kernel: [  240.145162]  ffff88014915bfd8 0000000000013840 ffff8801490c9e90 ffff88014732ca08
Dec 11 21:49:14 tolnedra kernel: [  240.145313]  ffff88014732ca0c ffff8801490c9e90 00000000ffffffff ffff88014732ca10
Dec 11 21:49:14 tolnedra kernel: [  240.145464] Call Trace:
Dec 11 21:49:14 tolnedra kernel: [  240.145529]  [<ffffffff81785589>] schedule_preempt_disabled+0x29/0x70
Dec 11 21:49:14 tolnedra kernel: [  240.145658]  [<ffffffff81787b25>] __mutex_lock_slowpath+0xd5/0x1f0
Dec 11 21:49:14 tolnedra kernel: [  240.145782]  [<ffffffff81787c5f>] mutex_lock+0x1f/0x30
Dec 11 21:49:14 tolnedra kernel: [  240.154118]  [<ffffffffc044955b>] output_poll_execute+0x4b/0x180 [drm_kms_helper]
Dec 11 21:49:14 tolnedra kernel: [  240.162414]  [<ffffffff8108da32>] process_one_work+0x182/0x4e0
Dec 11 21:49:14 tolnedra kernel: [  240.170642]  [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0
Dec 11 21:49:14 tolnedra kernel: [  240.178795]  [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0
Dec 11 21:49:14 tolnedra kernel: [  240.186899]  [<ffffffff81094c6b>] kthread+0xdb/0x100
Dec 11 21:49:14 tolnedra kernel: [  240.194991]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
Dec 11 21:49:14 tolnedra kernel: [  240.203060]  [<ffffffff81789dfc>] ret_from_fork+0x7c/0xb0
Dec 11 21:49:14 tolnedra kernel: [  240.211078]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
Dec 11 21:49:14 tolnedra kernel: [  240.219183] INFO: task Xorg:2306 blocked for more than 120 seconds.
Dec 11 21:49:14 tolnedra kernel: [  240.227291]       Not tainted 3.16.0-28-generic #37-Ubuntu
Dec 11 21:49:14 tolnedra kernel: [  240.235115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 11 21:49:14 tolnedra kernel: [  240.242738] Xorg            D ffff88014ec13840     0  2306   2234 0x00400000
Dec 11 21:49:14 tolnedra kernel: [  240.250129]  ffff8801414ab380 0000000000000086 ffff88008a301460 0000000000013840
Dec 11 21:49:14 tolnedra kernel: [  240.257257]  ffff8801414abfd8 0000000000013840 ffff88008a301460 ffff88014732ca08
Dec 11 21:49:14 tolnedra kernel: [  240.264153]  ffff88014732ca0c ffff88008a301460 00000000ffffffff ffff88014732ca10
Dec 11 21:49:14 tolnedra kernel: [  240.145464] Call Trace:
Dec 11 21:49:14 tolnedra kernel: [  240.145529]  [<ffffffff81785589>] schedule_preempt_disabled+0x29/0x70
Dec 11 21:49:14 tolnedra kernel: [  240.145658]  [<ffffffff81787b25>] __mutex_lock_slowpath+0xd5/0x1f0
Dec 11 21:49:14 tolnedra kernel: [  240.145782]  [<ffffffff81787c5f>] mutex_lock+0x1f/0x30
Dec 11 21:49:14 tolnedra kernel: [  240.154118]  [<ffffffffc044955b>] output_poll_execute+0x4b/0x180 [drm_kms_helper]
Dec 11 21:49:14 tolnedra kernel: [  240.162414]  [<ffffffff8108da32>] process_one_work+0x182/0x4e0
Dec 11 21:49:14 tolnedra kernel: [  240.170642]  [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0
Dec 11 21:49:14 tolnedra kernel: [  240.178795]  [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0
Dec 11 21:49:14 tolnedra kernel: [  240.186899]  [<ffffffff81094c6b>] kthread+0xdb/0x100
Dec 11 21:49:14 tolnedra kernel: [  240.194991]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
Dec 11 21:49:14 tolnedra kernel: [  240.203060]  [<ffffffff81789dfc>] ret_from_fork+0x7c/0xb0
Dec 11 21:49:14 tolnedra kernel: [  240.211078]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
Dec 11 21:49:14 tolnedra kernel: [  240.219183] INFO: task Xorg:2306 blocked for more than 120 seconds.
Dec 11 21:49:14 tolnedra kernel: [  240.227291]       Not tainted 3.16.0-28-generic #37-Ubuntu
Dec 11 21:49:14 tolnedra kernel: [  240.235115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 11 21:49:14 tolnedra kernel: [  240.242738] Xorg            D ffff88014ec13840     0  2306   2234 0x00400000
Dec 11 21:49:14 tolnedra kernel: [  240.250129]  ffff8801414ab380 0000000000000086 ffff88008a301460 0000000000013840
Dec 11 21:49:14 tolnedra kernel: [  240.257257]  ffff8801414abfd8 0000000000013840 ffff88008a301460 ffff88014732ca08
Dec 11 21:49:14 tolnedra kernel: [  240.264153]  ffff88014732ca0c ffff88008a301460 00000000ffffffff ffff88014732ca10
Dec 11 21:49:14 tolnedra kernel: [  240.270991] Call Trace:
Dec 11 21:49:14 tolnedra kernel: [  240.277736]  [<ffffffff81785589>] schedule_preempt_disabled+0x29/0x70
Dec 11 21:49:14 tolnedra kernel: [  240.284552]  [<ffffffff81787b25>] __mutex_lock_slowpath+0xd5/0x1f0
Dec 11 21:49:14 tolnedra kernel: [  240.291325]  [<ffffffff81787c5f>] mutex_lock+0x1f/0x30
Dec 11 21:49:14 tolnedra kernel: [  240.298120]  [<ffffffffc03ed072>] drm_modeset_lock_all+0x42/0xd0 [drm]
Dec 11 21:49:14 tolnedra kernel: [  240.304934]  [<ffffffffc044b2bf>] drm_fb_helper_pan_display+0x2f/0xf0 [drm_kms_helper]
Dec 11 21:49:14 tolnedra kernel: [  240.311769]  [<ffffffff8107e309>] ? mod_timer+0x129/0x1f0
Dec 11 21:49:14 tolnedra kernel: [  240.318593]  [<ffffffff8141772a>] fb_pan_display+0x9a/0x160
Dec 11 21:49:14 tolnedra kernel: [  240.325410]  [<ffffffff814118c0>] bit_update_start+0x20/0x50
Dec 11 21:49:14 tolnedra kernel: [  240.332162]  [<ffffffff8140ff04>] fbcon_switch+0x3b4/0x5a0
Dec 11 21:49:14 tolnedra kernel: [  240.338859]  [<ffffffff81499d39>] redraw_screen+0x199/0x260
Dec 11 21:49:14 tolnedra kernel: [  240.345523]  [<ffffffff8140e51a>] fbcon_blank+0x20a/0x300
Dec 11 21:49:14 tolnedra kernel: [  240.352130]  [<ffffffff810cd7b4>] ? wake_up_klogd+0x34/0x50
Dec 11 21:49:14 tolnedra kernel: [  240.358690]  [<ffffffff810cda48>] ? console_unlock+0x278/0x420
Dec 11 21:49:14 tolnedra kernel: [  240.365212]  [<ffffffff8107cd2b>] ? lock_timer_base.isra.34+0x2b/0x50
Dec 11 21:49:14 tolnedra kernel: [  240.371749]  [<ffffffff8107c4df>] ? internal_add_timer+0x2f/0x70
Dec 11 21:49:14 tolnedra kernel: [  240.378225]  [<ffffffff8107e309>] ? mod_timer+0x129/0x1f0
Dec 11 21:49:14 tolnedra kernel: [  240.384647]  [<ffffffff8149a87a>] do_unblank_screen+0xba/0x1f0
Dec 11 21:49:14 tolnedra kernel: [  240.391057]  [<ffffffff8149a9c0>] unblank_screen+0x10/0x20
Dec 11 21:49:14 tolnedra kernel: [  240.397431]  [<ffffffff813aa639>] bust_spinlocks+0x19/0x40
Dec 11 21:49:14 tolnedra kernel: [  240.403761]  [<ffffffff81016be8>] oops_end+0x38/0x150
Dec 11 21:49:14 tolnedra kernel: [  240.410065]  [<ffffffff8105c5bc>] no_context+0x12c/0x310
Dec 11 21:49:14 tolnedra kernel: [  240.416324]  [<ffffffff8105c81d>] __bad_area_nosemaphore+0x7d/0x210
Dec 11 21:49:15 tolnedra kernel: [  240.422584]  [<ffffffff8107cd2b>] ? lock_timer_base.isra.34+0x2b/0x50
Dec 11 21:49:15 tolnedra kernel: [  240.428829]  [<ffffffff8105c9c3>] bad_area_nosemaphore+0x13/0x20
Dec 11 21:49:15 tolnedra kernel: [  240.435065]  [<ffffffff8105cd4e>] __do_page_fault+0xce/0x580
Dec 11 21:49:15 tolnedra kernel: [  240.441384]  [<ffffffffc04b7a2e>] ? atom_op_move+0xbe/0x1e0 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.447693]  [<ffffffffc049d50a>] ? cail_reg_write+0x1a/0x20 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.453993]  [<ffffffffc04b4c38>] ? atom_put_dst+0x478/0x560 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.460241]  [<ffffffff8105d231>] do_page_fault+0x31/0x70
Dec 11 21:49:15 tolnedra kernel: [  240.466562]  [<ffffffffc05134f7>] ? evergreen_hdmi_setmode+0x8d7/0xbd0 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.472687]  [<ffffffff8178bee8>] page_fault+0x28/0x30
Dec 11 21:49:15 tolnedra kernel: [  240.478642]  [<ffffffffc05134f7>] ? evergreen_hdmi_setmode+0x8d7/0xbd0 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.484581]  [<ffffffff811c2046>] ? kfree+0x56/0x150
Dec 11 21:49:15 tolnedra kernel: [  240.490604]  [<ffffffffc05134f7>] evergreen_hdmi_setmode+0x8d7/0xbd0 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.496679]  [<ffffffffc03f4cf4>] ? drm_detect_hdmi_monitor+0x74/0xc0 [drm]
Dec 11 21:49:15 tolnedra kernel: [  240.502716]  [<ffffffffc051ab58>] radeon_atom_encoder_mode_set+0x158/0x2d0 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.508667]  [<ffffffffc0447966>] drm_crtc_helper_set_mode+0x356/0x530 [drm_kms_helper]
Dec 11 21:49:15 tolnedra kernel: [  240.514629]  [<ffffffffc04486db>] drm_crtc_helper_set_config+0x98b/0xb10 [drm_kms_helper]
Dec 11 21:49:15 tolnedra kernel: [  240.520540]  [<ffffffff8139c971>] ? idr_mark_full+0x61/0x70
Dec 11 21:49:15 tolnedra kernel: [  240.526483]  [<ffffffffc04c5d64>] radeon_crtc_set_config+0x44/0x120 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.532422]  [<ffffffffc03ec6d1>] drm_mode_set_config_internal+0x61/0xe0 [drm]
Dec 11 21:49:15 tolnedra kernel: [  240.538327]  [<ffffffffc03f0413>] drm_mode_setcrtc+0x283/0x580 [drm]
Dec 11 21:49:15 tolnedra kernel: [  240.544162]  [<ffffffffc03e0a4f>] drm_ioctl+0x1df/0x680 [drm]
Dec 11 21:49:15 tolnedra kernel: [  240.549953]  [<ffffffffc049d04c>] radeon_drm_ioctl+0x4c/0x80 [radeon]
Dec 11 21:49:15 tolnedra kernel: [  240.555653]  [<ffffffff811f5138>] do_vfs_ioctl+0x2c8/0x4a0
Dec 11 21:49:15 tolnedra kernel: [  240.561361]  [<ffffffff811f5391>] SyS_ioctl+0x81/0xa0
Dec 11 21:49:15 tolnedra kernel: [  240.567108]  [<ffffffff81789ead>] system_call_fastpath+0x1a/0x1f

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "lspci-vnvn.log"
   https://bugs.launchpad.net/bugs/1402172/+attachment/4280154/+files/lspci-vnvn.log

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1402172

Title:
  kernel 3.16.0-28-generic breaks Radeon HD 6310

Status in linux package in Ubuntu:
  New

Bug description:
  When applying the updates on my Ubuntu Utopic installation I received the new 3.16.0-28 kernel.
  The computer had no problems with the Utopic kernels before ( up to 3.16.0-26), but now it suddenly won't give any output (via HDMI) when booting. I don't get X, I don't get a splah and I can't switch with ctrl+alt+fX to one of the terminals.

  When booting with the older kernels or the latest (3.18.0) kernel from
  http://kernel.ubuntu.com/~kernel-ppa/mainline/ no problem appears. I
  also reinstalled the 3.16.0-28 kernel image and reran update-
  initramfs, but the problem stays. So something explicitly in this
  kernel is creating this issue.

  
  Below I paste the relevant messages i found in the dmesg/syslog:

  Dec 11 21:49:14 tolnedra kernel: [  240.144267] INFO: task kworker/0:0:4 blocked for more than 120 seconds.
  Dec 11 21:49:14 tolnedra kernel: [  240.144419]       Not tainted 3.16.0-28-generic #37-Ubuntu
  Dec 11 21:49:14 tolnedra kernel: [  240.144526] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Dec 11 21:49:14 tolnedra kernel: [  240.144677] kworker/0:0     D ffff88014ec13840     0     4      2 0x00000000
  Dec 11 21:49:14 tolnedra kernel: [  240.144889] Workqueue: events output_poll_execute [drm_kms_helper]
  Dec 11 21:49:14 tolnedra kernel: [  240.145011]  ffff88014915bd40 0000000000000046 ffff8801490c9e90 0000000000013840
  Dec 11 21:49:14 tolnedra kernel: [  240.145162]  ffff88014915bfd8 0000000000013840 ffff8801490c9e90 ffff88014732ca08
  Dec 11 21:49:14 tolnedra kernel: [  240.145313]  ffff88014732ca0c ffff8801490c9e90 00000000ffffffff ffff88014732ca10
  Dec 11 21:49:14 tolnedra kernel: [  240.145464] Call Trace:
  Dec 11 21:49:14 tolnedra kernel: [  240.145529]  [<ffffffff81785589>] schedule_preempt_disabled+0x29/0x70
  Dec 11 21:49:14 tolnedra kernel: [  240.145658]  [<ffffffff81787b25>] __mutex_lock_slowpath+0xd5/0x1f0
  Dec 11 21:49:14 tolnedra kernel: [  240.145782]  [<ffffffff81787c5f>] mutex_lock+0x1f/0x30
  Dec 11 21:49:14 tolnedra kernel: [  240.154118]  [<ffffffffc044955b>] output_poll_execute+0x4b/0x180 [drm_kms_helper]
  Dec 11 21:49:14 tolnedra kernel: [  240.162414]  [<ffffffff8108da32>] process_one_work+0x182/0x4e0
  Dec 11 21:49:14 tolnedra kernel: [  240.170642]  [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0
  Dec 11 21:49:14 tolnedra kernel: [  240.178795]  [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0
  Dec 11 21:49:14 tolnedra kernel: [  240.186899]  [<ffffffff81094c6b>] kthread+0xdb/0x100
  Dec 11 21:49:14 tolnedra kernel: [  240.194991]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
  Dec 11 21:49:14 tolnedra kernel: [  240.203060]  [<ffffffff81789dfc>] ret_from_fork+0x7c/0xb0
  Dec 11 21:49:14 tolnedra kernel: [  240.211078]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
  Dec 11 21:49:14 tolnedra kernel: [  240.219183] INFO: task Xorg:2306 blocked for more than 120 seconds.
  Dec 11 21:49:14 tolnedra kernel: [  240.227291]       Not tainted 3.16.0-28-generic #37-Ubuntu
  Dec 11 21:49:14 tolnedra kernel: [  240.235115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Dec 11 21:49:14 tolnedra kernel: [  240.242738] Xorg            D ffff88014ec13840     0  2306   2234 0x00400000
  Dec 11 21:49:14 tolnedra kernel: [  240.250129]  ffff8801414ab380 0000000000000086 ffff88008a301460 0000000000013840
  Dec 11 21:49:14 tolnedra kernel: [  240.257257]  ffff8801414abfd8 0000000000013840 ffff88008a301460 ffff88014732ca08
  Dec 11 21:49:14 tolnedra kernel: [  240.264153]  ffff88014732ca0c ffff88008a301460 00000000ffffffff ffff88014732ca10
  Dec 11 21:49:14 tolnedra kernel: [  240.145464] Call Trace:
  Dec 11 21:49:14 tolnedra kernel: [  240.145529]  [<ffffffff81785589>] schedule_preempt_disabled+0x29/0x70
  Dec 11 21:49:14 tolnedra kernel: [  240.145658]  [<ffffffff81787b25>] __mutex_lock_slowpath+0xd5/0x1f0
  Dec 11 21:49:14 tolnedra kernel: [  240.145782]  [<ffffffff81787c5f>] mutex_lock+0x1f/0x30
  Dec 11 21:49:14 tolnedra kernel: [  240.154118]  [<ffffffffc044955b>] output_poll_execute+0x4b/0x180 [drm_kms_helper]
  Dec 11 21:49:14 tolnedra kernel: [  240.162414]  [<ffffffff8108da32>] process_one_work+0x182/0x4e0
  Dec 11 21:49:14 tolnedra kernel: [  240.170642]  [<ffffffff8108ddfb>] worker_thread+0x6b/0x6a0
  Dec 11 21:49:14 tolnedra kernel: [  240.178795]  [<ffffffff8108dd90>] ? process_one_work+0x4e0/0x4e0
  Dec 11 21:49:14 tolnedra kernel: [  240.186899]  [<ffffffff81094c6b>] kthread+0xdb/0x100
  Dec 11 21:49:14 tolnedra kernel: [  240.194991]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
  Dec 11 21:49:14 tolnedra kernel: [  240.203060]  [<ffffffff81789dfc>] ret_from_fork+0x7c/0xb0
  Dec 11 21:49:14 tolnedra kernel: [  240.211078]  [<ffffffff81094b90>] ? kthread_create_on_node+0x1c0/0x1c0
  Dec 11 21:49:14 tolnedra kernel: [  240.219183] INFO: task Xorg:2306 blocked for more than 120 seconds.
  Dec 11 21:49:14 tolnedra kernel: [  240.227291]       Not tainted 3.16.0-28-generic #37-Ubuntu
  Dec 11 21:49:14 tolnedra kernel: [  240.235115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  Dec 11 21:49:14 tolnedra kernel: [  240.242738] Xorg            D ffff88014ec13840     0  2306   2234 0x00400000
  Dec 11 21:49:14 tolnedra kernel: [  240.250129]  ffff8801414ab380 0000000000000086 ffff88008a301460 0000000000013840
  Dec 11 21:49:14 tolnedra kernel: [  240.257257]  ffff8801414abfd8 0000000000013840 ffff88008a301460 ffff88014732ca08
  Dec 11 21:49:14 tolnedra kernel: [  240.264153]  ffff88014732ca0c ffff88008a301460 00000000ffffffff ffff88014732ca10
  Dec 11 21:49:14 tolnedra kernel: [  240.270991] Call Trace:
  Dec 11 21:49:14 tolnedra kernel: [  240.277736]  [<ffffffff81785589>] schedule_preempt_disabled+0x29/0x70
  Dec 11 21:49:14 tolnedra kernel: [  240.284552]  [<ffffffff81787b25>] __mutex_lock_slowpath+0xd5/0x1f0
  Dec 11 21:49:14 tolnedra kernel: [  240.291325]  [<ffffffff81787c5f>] mutex_lock+0x1f/0x30
  Dec 11 21:49:14 tolnedra kernel: [  240.298120]  [<ffffffffc03ed072>] drm_modeset_lock_all+0x42/0xd0 [drm]
  Dec 11 21:49:14 tolnedra kernel: [  240.304934]  [<ffffffffc044b2bf>] drm_fb_helper_pan_display+0x2f/0xf0 [drm_kms_helper]
  Dec 11 21:49:14 tolnedra kernel: [  240.311769]  [<ffffffff8107e309>] ? mod_timer+0x129/0x1f0
  Dec 11 21:49:14 tolnedra kernel: [  240.318593]  [<ffffffff8141772a>] fb_pan_display+0x9a/0x160
  Dec 11 21:49:14 tolnedra kernel: [  240.325410]  [<ffffffff814118c0>] bit_update_start+0x20/0x50
  Dec 11 21:49:14 tolnedra kernel: [  240.332162]  [<ffffffff8140ff04>] fbcon_switch+0x3b4/0x5a0
  Dec 11 21:49:14 tolnedra kernel: [  240.338859]  [<ffffffff81499d39>] redraw_screen+0x199/0x260
  Dec 11 21:49:14 tolnedra kernel: [  240.345523]  [<ffffffff8140e51a>] fbcon_blank+0x20a/0x300
  Dec 11 21:49:14 tolnedra kernel: [  240.352130]  [<ffffffff810cd7b4>] ? wake_up_klogd+0x34/0x50
  Dec 11 21:49:14 tolnedra kernel: [  240.358690]  [<ffffffff810cda48>] ? console_unlock+0x278/0x420
  Dec 11 21:49:14 tolnedra kernel: [  240.365212]  [<ffffffff8107cd2b>] ? lock_timer_base.isra.34+0x2b/0x50
  Dec 11 21:49:14 tolnedra kernel: [  240.371749]  [<ffffffff8107c4df>] ? internal_add_timer+0x2f/0x70
  Dec 11 21:49:14 tolnedra kernel: [  240.378225]  [<ffffffff8107e309>] ? mod_timer+0x129/0x1f0
  Dec 11 21:49:14 tolnedra kernel: [  240.384647]  [<ffffffff8149a87a>] do_unblank_screen+0xba/0x1f0
  Dec 11 21:49:14 tolnedra kernel: [  240.391057]  [<ffffffff8149a9c0>] unblank_screen+0x10/0x20
  Dec 11 21:49:14 tolnedra kernel: [  240.397431]  [<ffffffff813aa639>] bust_spinlocks+0x19/0x40
  Dec 11 21:49:14 tolnedra kernel: [  240.403761]  [<ffffffff81016be8>] oops_end+0x38/0x150
  Dec 11 21:49:14 tolnedra kernel: [  240.410065]  [<ffffffff8105c5bc>] no_context+0x12c/0x310
  Dec 11 21:49:14 tolnedra kernel: [  240.416324]  [<ffffffff8105c81d>] __bad_area_nosemaphore+0x7d/0x210
  Dec 11 21:49:15 tolnedra kernel: [  240.422584]  [<ffffffff8107cd2b>] ? lock_timer_base.isra.34+0x2b/0x50
  Dec 11 21:49:15 tolnedra kernel: [  240.428829]  [<ffffffff8105c9c3>] bad_area_nosemaphore+0x13/0x20
  Dec 11 21:49:15 tolnedra kernel: [  240.435065]  [<ffffffff8105cd4e>] __do_page_fault+0xce/0x580
  Dec 11 21:49:15 tolnedra kernel: [  240.441384]  [<ffffffffc04b7a2e>] ? atom_op_move+0xbe/0x1e0 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.447693]  [<ffffffffc049d50a>] ? cail_reg_write+0x1a/0x20 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.453993]  [<ffffffffc04b4c38>] ? atom_put_dst+0x478/0x560 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.460241]  [<ffffffff8105d231>] do_page_fault+0x31/0x70
  Dec 11 21:49:15 tolnedra kernel: [  240.466562]  [<ffffffffc05134f7>] ? evergreen_hdmi_setmode+0x8d7/0xbd0 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.472687]  [<ffffffff8178bee8>] page_fault+0x28/0x30
  Dec 11 21:49:15 tolnedra kernel: [  240.478642]  [<ffffffffc05134f7>] ? evergreen_hdmi_setmode+0x8d7/0xbd0 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.484581]  [<ffffffff811c2046>] ? kfree+0x56/0x150
  Dec 11 21:49:15 tolnedra kernel: [  240.490604]  [<ffffffffc05134f7>] evergreen_hdmi_setmode+0x8d7/0xbd0 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.496679]  [<ffffffffc03f4cf4>] ? drm_detect_hdmi_monitor+0x74/0xc0 [drm]
  Dec 11 21:49:15 tolnedra kernel: [  240.502716]  [<ffffffffc051ab58>] radeon_atom_encoder_mode_set+0x158/0x2d0 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.508667]  [<ffffffffc0447966>] drm_crtc_helper_set_mode+0x356/0x530 [drm_kms_helper]
  Dec 11 21:49:15 tolnedra kernel: [  240.514629]  [<ffffffffc04486db>] drm_crtc_helper_set_config+0x98b/0xb10 [drm_kms_helper]
  Dec 11 21:49:15 tolnedra kernel: [  240.520540]  [<ffffffff8139c971>] ? idr_mark_full+0x61/0x70
  Dec 11 21:49:15 tolnedra kernel: [  240.526483]  [<ffffffffc04c5d64>] radeon_crtc_set_config+0x44/0x120 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.532422]  [<ffffffffc03ec6d1>] drm_mode_set_config_internal+0x61/0xe0 [drm]
  Dec 11 21:49:15 tolnedra kernel: [  240.538327]  [<ffffffffc03f0413>] drm_mode_setcrtc+0x283/0x580 [drm]
  Dec 11 21:49:15 tolnedra kernel: [  240.544162]  [<ffffffffc03e0a4f>] drm_ioctl+0x1df/0x680 [drm]
  Dec 11 21:49:15 tolnedra kernel: [  240.549953]  [<ffffffffc049d04c>] radeon_drm_ioctl+0x4c/0x80 [radeon]
  Dec 11 21:49:15 tolnedra kernel: [  240.555653]  [<ffffffff811f5138>] do_vfs_ioctl+0x2c8/0x4a0
  Dec 11 21:49:15 tolnedra kernel: [  240.561361]  [<ffffffff811f5391>] SyS_ioctl+0x81/0xa0
  Dec 11 21:49:15 tolnedra kernel: [  240.567108]  [<ffffffff81789ead>] system_call_fastpath+0x1a/0x1f

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402172/+subscriptions