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[Bug 1535714] Re: i915 freeze

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Vegard Vesterheim <1535714@xxxxxxxxxxxxxxxxxx>
Date: Fri, 11 Mar 2016 11:59:03 -0000
Reply-to: Bug 1535714 <1535714@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
I am having similar problems with xenial (Kernel 4.4). Xorg crash,
console is "frozen". Machine is up and running (can log in via ssh).

Shutdown/reboot does not work. Machine must be powercycled to be usable
again.

 Seems to occur after screen has been idle for sometime.

[ 3301.824747] ------------[ cut here ]------------
[ 3301.824763] WARNING: CPU: 1 PID: 3465 at /build/linux-H9bHY_/linux-4.4.0/include/linux/kref.h:46 drm_framebuffer_reference+0x64/0x70 [drm]()
[ 3301.824785] Modules linked in: rfcomm veth ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables nls_utf8 cifs fscache xt_addrtype xt_conntrack aufs xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables uas usb_storage bnep binfmt_misc uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core btusb v4l2_common btrtl btbcm joydev btintel videodev snd_usb_audio bluetooth input_leds snd_usbmidi_lib media bridge snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic hp_wmi sparse_keymap snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm 8021q intel_rapl x86_pkg_temp_thermal garp intel_powerclamp mrp coretemp crct10dif_pclmul
[ 3301.824804]  stp crc32_pclmul llc aesni_intel snd_seq_midi snd_seq_midi_event aes_x86_64 lrw gf128mul snd_rawmidi glue_helper ablk_helper cryptd snd_seq serio_raw snd_seq_device snd_timer mei_me mei snd lpc_ich soundcore 8250_fintek tpm_infineon mac_hid kvm_intel kvm irqbypass ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi parport_pc ppdev sunrpc lp parport autofs4 hid_lenovo hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect e1000e sysimgblt fb_sys_fops psmouse ahci drm ptp libahci pps_core wmi fjes video
[ 3301.824806] CPU: 1 PID: 3465 Comm: Xorg Not tainted 4.4.0-11-generic #26-Ubuntu
[ 3301.824807] Hardware name: Hewlett-Packard HP EliteDesk 800 G1 USDT/18E5, BIOS L01 v02.21 12/17/2013
[ 3301.824808]  0000000000000286 00000000e8c70193 ffff880404323920 ffffffff813e1ec3
[ 3301.824809]  0000000000000000 ffffffffc0080800 ffff880404323958 ffffffff8107fe12
[ 3301.824810]  ffff88040551f240 ffff8800d53da900 ffff8800d53da900 ffff88040986d000
[ 3301.824810] Call Trace:
[ 3301.824814]  [<ffffffff813e1ec3>] dump_stack+0x63/0x90
[ 3301.824817]  [<ffffffff8107fe12>] warn_slowpath_common+0x82/0xc0
[ 3301.824818]  [<ffffffff8107ff5a>] warn_slowpath_null+0x1a/0x20
[ 3301.824826]  [<ffffffffc00589b4>] drm_framebuffer_reference+0x64/0x70 [drm]
[ 3301.824835]  [<ffffffffc0069c6d>] drm_atomic_set_fb_for_plane+0x2d/0x90 [drm]
[ 3301.824842]  [<ffffffffc016b47e>] __drm_atomic_helper_set_config+0xde/0x3c0 [drm_kms_helper]
[ 3301.824846]  [<ffffffffc016c3b1>] restore_fbdev_mode+0x221/0x260 [drm_kms_helper]
[ 3301.824855]  [<ffffffffc00683da>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
[ 3301.824860]  [<ffffffffc016e593>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
[ 3301.824864]  [<ffffffffc016e60d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
[ 3301.824881]  [<ffffffffc02259aa>] intel_fbdev_set_par+0x1a/0x60 [i915]
[ 3301.824882]  [<ffffffff814650ef>] ? fb_set_var+0x2ef/0x460
[ 3301.824883]  [<ffffffff81465036>] fb_set_var+0x236/0x460
[ 3301.824885]  [<ffffffff810b3979>] ? update_curr+0x79/0x160
[ 3301.824888]  [<ffffffff8145b34f>] fbcon_blank+0x30f/0x350
[ 3301.824889]  [<ffffffff810168b0>] ? __switch_to+0x420/0x5a0
[ 3301.824892]  [<ffffffff814f23f3>] do_unblank_screen+0xd3/0x1a0
[ 3301.824893]  [<ffffffff814e74e9>] complete_change_console+0x59/0xe0
[ 3301.824894]  [<ffffffff814e7c80>] vt_ioctl+0x710/0x12f0
[ 3301.824900]  [<ffffffffc004e759>] ? drm_ioctl+0x189/0x540 [drm]
[ 3301.824902]  [<ffffffff814dafaf>] tty_ioctl+0x35f/0xc40
[ 3301.824904]  [<ffffffff8121e3ef>] do_vfs_ioctl+0x29f/0x490
[ 3301.824906]  [<ffffffff8120d281>] ? __sb_end_write+0x21/0x30
[ 3301.824907]  [<ffffffff8120ae9d>] ? vfs_write+0x15d/0x1a0
[ 3301.824908]  [<ffffffff8121e659>] SyS_ioctl+0x79/0x90
[ 3301.824911]  [<ffffffff8181c832>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 3301.824911] ---[ end trace 4689e440543b0147 ]---
[ 3301.824936] BUG: unable to handle kernel NULL pointer dereference at 000000000000002a
[ 3301.824951] IP: [<ffffffffc020c274>] intel_pin_and_fence_fb_obj+0x184/0x2b0 [i915]
[ 3301.824952] PGD 0 
[ 3301.824953] Oops: 0000 [#1] SMP 
[ 3301.824964] Modules linked in: rfcomm veth ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables nls_utf8 cifs fscache xt_addrtype xt_conntrack aufs xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp iptable_filter ip_tables x_tables uas usb_storage bnep binfmt_misc uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core btusb v4l2_common btrtl btbcm joydev btintel videodev snd_usb_audio bluetooth input_leds snd_usbmidi_lib media bridge snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic hp_wmi sparse_keymap snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm 8021q intel_rapl x86_pkg_temp_thermal garp intel_powerclamp mrp coretemp crct10dif_pclmul
[ 3301.824975]  stp crc32_pclmul llc aesni_intel snd_seq_midi snd_seq_midi_event aes_x86_64 lrw gf128mul snd_rawmidi glue_helper ablk_helper cryptd snd_seq serio_raw snd_seq_device snd_timer mei_me mei snd lpc_ich soundcore 8250_fintek tpm_infineon mac_hid kvm_intel kvm irqbypass ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi parport_pc ppdev sunrpc lp parport autofs4 hid_lenovo hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect e1000e sysimgblt fb_sys_fops psmouse ahci drm ptp libahci pps_core wmi fjes video
[ 3301.824976] CPU: 1 PID: 3465 Comm: Xorg Tainted: G        W       4.4.0-11-generic #26-Ubuntu
[ 3301.824976] Hardware name: Hewlett-Packard HP EliteDesk 800 G1 USDT/18E5, BIOS L01 v02.21 12/17/2013
[ 3301.824977] task: ffff8800dbab6040 ti: ffff880404320000 task.ti: ffff880404320000
[ 3301.824992] RIP: 0010:[<ffffffffc020c274>]  [<ffffffffc020c274>] intel_pin_and_fence_fb_obj+0x184/0x2b0 [i915]
[ 3301.824993] RSP: 0018:ffff880404323818  EFLAGS: 00010246
[ 3301.824993] RAX: ffff8800d53da900 RBX: ffff88040bbfdc00 RCX: 0000000000000000
[ 3301.824994] RDX: 0100000000000001 RSI: 0000000000000000 RDI: ffff88040bbfdc00
[ 3301.824994] RBP: ffff8804043238c0 R08: 0000000000000000 R09: ffff88040a809040
[ 3301.824994] R10: ffff88040beb9000 R11: 0000000000000001 R12: 0000000000000000
[ 3301.824995] R13: ffff880405590000 R14: ffff88040551f300 R15: ffff88040551f240
[ 3301.824996] FS:  00007ffbf5dcea00(0000) GS:ffff88041ea40000(0000) knlGS:0000000000000000
[ 3301.824996] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3301.824997] CR2: 000000000000002a CR3: 00000000d572e000 CR4: 00000000001406e0
[ 3301.824997] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3301.824998] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 3301.824998] Stack:
[ 3301.824999]  ffff880404323858 0000000000000000 0000000000000000 ffff8800d53dac00
[ 3301.825000]  ffff880405a00800 ffff88040beb9000 ffff880405a00800 00000000e8c70193
[ 3301.825001]  ffff88040beb9000 ffff88040986e000 ffff88040c21a000 ffff880405a58000
[ 3301.825001] Call Trace:
[ 3301.825016]  [<ffffffffc0200852>] ? haswell_crtc_compute_clock+0x12/0x30 [i915]
[ 3301.825030]  [<ffffffffc0218167>] intel_prepare_plane_fb+0x87/0x140 [i915]
[ 3301.825034]  [<ffffffffc0168773>] drm_atomic_helper_prepare_planes+0x53/0xc0 [drm_kms_helper]
[ 3301.825049]  [<ffffffffc0210778>] intel_atomic_commit+0x78/0x6f0 [i915]
[ 3301.825059]  [<ffffffffc006977e>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[ 3301.825068]  [<ffffffffc0069527>] ? drm_atomic_add_affected_connectors+0x27/0xf0 [drm]
[ 3301.825078]  [<ffffffffc0069bb7>] drm_atomic_commit+0x37/0x60 [drm]
[ 3301.825082]  [<ffffffffc016c3bf>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper]
[ 3301.825091]  [<ffffffffc00683da>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
[ 3301.825095]  [<ffffffffc016e593>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
[ 3301.825099]  [<ffffffffc016e60d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
[ 3301.825114]  [<ffffffffc02259aa>] intel_fbdev_set_par+0x1a/0x60 [i915]
[ 3301.825115]  [<ffffffff814650ef>] ? fb_set_var+0x2ef/0x460
[ 3301.825116]  [<ffffffff81465036>] fb_set_var+0x236/0x460
[ 3301.825118]  [<ffffffff810b3979>] ? update_curr+0x79/0x160
[ 3301.825119]  [<ffffffff8145b34f>] fbcon_blank+0x30f/0x350
[ 3301.825120]  [<ffffffff810168b0>] ? __switch_to+0x420/0x5a0
[ 3301.825122]  [<ffffffff814f23f3>] do_unblank_screen+0xd3/0x1a0
[ 3301.825123]  [<ffffffff814e74e9>] complete_change_console+0x59/0xe0
[ 3301.825124]  [<ffffffff814e7c80>] vt_ioctl+0x710/0x12f0
[ 3301.825130]  [<ffffffffc004e759>] ? drm_ioctl+0x189/0x540 [drm]
[ 3301.825131]  [<ffffffff814dafaf>] tty_ioctl+0x35f/0xc40
[ 3301.825133]  [<ffffffff8121e3ef>] do_vfs_ioctl+0x29f/0x490
[ 3301.825134]  [<ffffffff8120d281>] ? __sb_end_write+0x21/0x30
[ 3301.825135]  [<ffffffff8120ae9d>] ? vfs_write+0x15d/0x1a0
[ 3301.825136]  [<ffffffff8121e659>] SyS_ioctl+0x79/0x90
[ 3301.825138]  [<ffffffff8181c832>] entry_SYSCALL_64_fastpath+0x16/0x71
[ 3301.825147] Code: fa ff 89 d8 48 8b 75 d0 65 48 33 34 25 28 00 00 00 0f 85 39 01 00 00 48 83 ec 80 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 85 c9 75 4e <41> 0f b6 54 24 2a bb 00 00 04 00 80 fa 08 0f 87 08 ff ff ff 41 
[ 3301.825162] RIP  [<ffffffffc020c274>] intel_pin_and_fence_fb_obj+0x184/0x2b0 [i915]
[ 3301.825162]  RSP <ffff880404323818>
[ 3301.825163] CR2: 000000000000002a
[ 3301.825164] ---[ end trace 4689e440543b0148 ]---

-- 
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https://bugs.launchpad.net/bugs/1535714

Title:
  i915 freeze

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  randomly system will freeze. Freeze in that screen will be blank and
  system will not accept keyboard commands to change to a terminal or to
  chagne the caps lock light.

  Can ssh into the laptop while its  "frozen". The syslog/journal shows
  a kenel stacktrace (below)

  Seems more common after suspending.

  don't recall it happening with 15.04. If it did start with 15.04 it
  would of been with the latter kernels.

  Seems similar to:
  https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1454868

  
  ### kenel crash log from logs ###

  Jan 19 23:23:10 ath lightdm[6665]: pam_unix(lightdm:session): session closed for user bob
  Jan 19 23:23:10 ath kernel: ------------[ cut here ]------------
  Jan 19 23:23:10 ath kernel: WARNING: CPU: 2 PID: 6493 at /home/kernel/COD/linux/include/linux/kref.h:46 drm_framebuffer_reference+0x64/0x70 [d
  Jan 19 23:23:10 ath kernel: Modules linked in: ctr ccm rfcomm xt_recent xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptab
  Jan 19 23:23:10 ath kernel:  snd_hda_core memstick serio_raw snd_pcm_dmaengine snd_hwdep snd_pcm snd_seq_midi i2c_designware_platform snd_seq_
  Jan 19 23:23:10 ath kernel:  ppdev lp parport autofs4 btrfs drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt raid10 raid456 async_r
  Jan 19 23:23:10 ath kernel: CPU: 2 PID: 6493 Comm: Xorg Not tainted 4.4.0-040400rc7-generic #201512272230
  Jan 19 23:23:10 ath kernel: Hardware name: ASUSTeK COMPUTER INC. X200MA/X200MA, BIOS X200MA.302 01/21/2014
  Jan 19 23:23:10 ath kernel:  0000000000000000 00000000d23b3796 ffff880019dc3948 ffffffff813c9124
  Jan 19 23:23:10 ath kernel:  0000000000000000 ffff880019dc3980 ffffffff8107db92 ffff880035b446c0
  Jan 19 23:23:10 ath kernel:  ffff88001834c300 ffff88001834c300 ffff88010b10ac00 ffff880035484000
  Jan 19 23:23:10 ath kernel: Call Trace:
  Jan 19 23:23:10 ath kernel:  [<ffffffff813c9124>] dump_stack+0x44/0x60
  Jan 19 23:23:10 ath kernel:  [<ffffffff8107db92>] warn_slowpath_common+0x82/0xc0
  Jan 19 23:23:10 ath kernel:  [<ffffffff8107dcda>] warn_slowpath_null+0x1a/0x20
  Jan 19 23:23:10 ath kernel:  [<ffffffffc00d4704>] drm_framebuffer_reference+0x64/0x70 [drm]
  Jan 19 23:23:10 ath kernel:  [<ffffffffc00e6a0d>] drm_atomic_set_fb_for_plane+0x2d/0x90 [drm]
  Jan 19 23:23:10 ath kernel:  [<ffffffffc016bdde>] __drm_atomic_helper_set_config+0xde/0x3c0 [drm_kms_helper]
  Jan 19 23:23:10 ath kernel:  [<ffffffffc016cd01>] restore_fbdev_mode+0x221/0x260 [drm_kms_helper]
  Jan 19 23:23:10 ath kernel:  [<ffffffffc016ef13>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
  Jan 19 23:23:10 ath kernel:  [<ffffffffc016ef8d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
  Jan 19 23:23:10 ath kernel:  [<ffffffffc024ecca>] intel_fbdev_set_par+0x1a/0x60 [i915]
  Jan 19 23:23:10 ath kernel:  [<ffffffff8144bf06>] fb_set_var+0x236/0x460
  Jan 19 23:23:10 ath kernel:  [<ffffffff810b4df4>] ? enqueue_task_fair+0xa4/0x8b0
  Jan 19 23:23:10 ath kernel:  [<ffffffff8101fd59>] ? sched_clock+0x9/0x10
  Jan 19 23:23:10 ath kernel:  [<ffffffff810ad9bf>] ? sched_clock_cpu+0x8f/0xa0
  Jan 19 23:23:10 ath kernel:  [<ffffffff8144221f>] fbcon_blank+0x30f/0x350
  Jan 19 23:23:10 ath kernel:  [<ffffffffc03b6b18>] ? set_extent_buffer_dirty+0x78/0xd0 [btrfs]
  Jan 19 23:23:10 ath kernel:  [<ffffffff814d8e33>] do_unblank_screen+0xd3/0x1a0
  Jan 19 23:23:10 ath kernel:  [<ffffffff814ce4fa>] vt_ioctl+0x50a/0x12f0
  Jan 19 23:23:10 ath kernel:  [<ffffffff814c1aff>] tty_ioctl+0x35f/0xc30
  Jan 19 23:23:10 ath kernel:  [<ffffffff811e5dc5>] ? kfree+0x115/0x130
  Jan 19 23:23:10 ath kernel:  [<ffffffff8121ca73>] ? dput+0xb3/0x220
  Jan 19 23:23:10 ath kernel:  [<ffffffff81226044>] ? mntput+0x24/0x40
  Jan 19 23:23:10 ath kernel:  [<ffffffff812192a8>] do_vfs_ioctl+0x298/0x480
  Jan 19 23:23:10 ath kernel:  [<ffffffff81207ade>] ? ____fput+0xe/0x10
  Jan 19 23:23:10 ath kernel:  [<ffffffff8109b138>] ? task_work_run+0x78/0x90
  Jan 19 23:23:10 ath kernel:  [<ffffffff81219509>] SyS_ioctl+0x79/0x90
  Jan 19 23:23:10 ath kernel:  [<ffffffff817fcff6>] entry_SYSCALL_64_fastpath+0x16/0x75
  Jan 19 23:23:10 ath kernel: ---[ end trace 65a51a25ba0b2f99 ]---
  Jan 19 23:23:10 ath kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000060
  Jan 19 23:23:10 ath kernel: IP: [<ffffffffc0245bbc>] intel_fb_obj_invalidate+0x1c/0xf0 [i915]
  Jan 19 23:23:10 ath kernel: PGD 0 
  Jan 19 23:23:10 ath kernel: Oops: 0000 [#1] SMP 
  Jan 19 23:23:10 ath kernel: Modules linked in: ctr ccm rfcomm xt_recent xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptab
  Jan 19 23:23:10 ath kernel:  snd_hda_core memstick serio_raw snd_pcm_dmaengine snd_hwdep snd_pcm snd_seq_midi i2c_designware_platform snd_seq_
  Jan 19 23:23:10 ath kernel:  ppdev lp parport autofs4 btrfs drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt raid10 raid456 async_r
  Jan 19 23:23:10 ath kernel: CPU: 2 PID: 6493 Comm: Xorg Tainted: G        W       4.4.0-040400rc7-generic #201512272230
  Jan 19 23:23:10 ath kernel: Hardware name: ASUSTeK COMPUTER INC. X200MA/X200MA, BIOS X200MA.302 01/21/2014
  Jan 19 23:23:10 ath kernel: task: ffff88006797be80 ti: ffff880019dc0000 task.ti: ffff880019dc0000
  Jan 19 23:23:10 ath kernel: RIP: 0010:[<ffffffffc0245bbc>]  [<ffffffffc0245bbc>] intel_fb_obj_invalidate+0x1c/0xf0 [i915]
  Jan 19 23:23:10 ath kernel: RSP: 0018:ffff880019dc3a80  EFLAGS: 00010246
  Jan 19 23:23:10 ath kernel: RAX: ffff88006797be80 RBX: ffff880110267500 RCX: 00000000000f7e8c
  Jan 19 23:23:10 ath kernel: RDX: ffff880035b446c0 RSI: 0000000000000000 RDI: ffff880110267500
  Jan 19 23:23:10 ath kernel: RBP: ffff880019dc3aa8 R08: 0000000000019d80 R09: ffffffffc00e4d46
  Jan 19 23:23:10 ath kernel: R10: ffffea0002489500 R11: ffff8800b2d5b600 R12: 0000000000000000
  Jan 19 23:23:10 ath kernel: R13: 0000000000000000 R14: 0000000000200001 R15: 0000000000000080
  Jan 19 23:23:10 ath kernel: FS:  00007f17d8149980(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000
  Jan 19 23:23:10 ath kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  Jan 19 23:23:10 ath kernel: CR2: 0000000000000060 CR3: 000000011a128000 CR4: 00000000001006e0
  Jan 19 23:23:10 ath kernel: Stack:
  Jan 19 23:23:10 ath kernel:  ffff880035475e00 ffff88003532b000 0000000000000000 0000000000200001
  Jan 19 23:23:10 ath kernel:  0000000000000080 ffff880019dc3ac8 ffffffffc024ecf3 000000000004aa1e
  Jan 19 23:23:10 ath kernel:  ffff880019dc3c70 ffff880019dc3c40 ffffffff8144bf06 ffff88003532b060
  Jan 19 23:23:10 ath kernel: Call Trace:
  Jan 19 23:23:10 ath kernel:  [<ffffffffc024ecf3>] intel_fbdev_set_par+0x43/0x60 [i915]
  Jan 19 23:23:10 ath kernel:  [<ffffffff8144bf06>] fb_set_var+0x236/0x460
  Jan 19 23:23:10 ath kernel:  [<ffffffff810b4df4>] ? enqueue_task_fair+0xa4/0x8b0
  Jan 19 23:23:10 ath kernel:  [<ffffffff8101fd59>] ? sched_clock+0x9/0x10
  Jan 19 23:23:10 ath kernel:  [<ffffffff810ad9bf>] ? sched_clock_cpu+0x8f/0xa0
  Jan 19 23:23:10 ath kernel:  [<ffffffff8144221f>] fbcon_blank+0x30f/0x350
  Jan 19 23:23:10 ath kernel:  [<ffffffffc03b6b18>] ? set_extent_buffer_dirty+0x78/0xd0 [btrfs]
  Jan 19 23:23:10 ath kernel:  [<ffffffff814d8e33>] do_unblank_screen+0xd3/0x1a0
  Jan 19 23:23:10 ath kernel:  [<ffffffff814ce4fa>] vt_ioctl+0x50a/0x12f0
  Jan 19 23:23:10 ath kernel:  [<ffffffff814c1aff>] tty_ioctl+0x35f/0xc30
  Jan 19 23:23:10 ath kernel:  [<ffffffff811e5dc5>] ? kfree+0x115/0x130
  Jan 19 23:23:10 ath kernel:  [<ffffffff8121ca73>] ? dput+0xb3/0x220
  Jan 19 23:23:10 ath kernel:  [<ffffffff81226044>] ? mntput+0x24/0x40
  Jan 19 23:23:10 ath kernel:  [<ffffffff812192a8>] do_vfs_ioctl+0x298/0x480
  Jan 19 23:23:10 ath kernel:  [<ffffffff81207ade>] ? ____fput+0xe/0x10
  Jan 19 23:23:10 ath kernel:  [<ffffffff8109b138>] ? task_work_run+0x78/0x90
  Jan 19 23:23:10 ath kernel:  [<ffffffff81219509>] SyS_ioctl+0x79/0x90
  Jan 19 23:23:10 ath kernel:  [<ffffffff817fcff6>] entry_SYSCALL_64_fastpath+0x16/0x75
  Jan 19 23:23:10 ath kernel: Code: 41 5f 5d c3 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 41 89 f5 53 
  Jan 19 23:23:10 ath kernel: RIP  [<ffffffffc0245bbc>] intel_fb_obj_invalidate+0x1c/0xf0 [i915]
  Jan 19 23:23:10 ath kernel:  RSP <ffff880019dc3a80>
  Jan 19 23:23:10 ath kernel: CR2: 0000000000000060
  Jan 19 23:23:10 ath kernel: ---[ end trace 65a51a25ba0b2f9a ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  Uname: Linux 4.4.0-040400rc7-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  Date: Tue Jan 19 23:32:16 2016
  DistUpgraded: 2015-10-26 07:28:02,425 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Several times a week
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation Atom Processor Z36xxx/Z37xxx Series Graphics & Display [8086:0f31] (rev 0c) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:15bd]
  InstallationDate: Installed on 2014-07-31 (537 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: ASUSTeK COMPUTER INC. X200MA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-040400rc7-generic root=UUID=5e8a8002-00f4-434f-a107-f6427d316379 ro rootflags=subvol=@ quiet splash zswap.enabled=1 nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: Upgraded to wily on 2015-10-25 (85 days ago)
  dmi.bios.date: 01/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X200MA.302
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X200MA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX200MA.302:bd01/21/2014:svnASUSTeKCOMPUTERINC.:pnX200MA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX200MA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X200MA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Tue Jan 19 13:52:59 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4377 
   vendor                                     CMN
  xserver.version: 2:1.17.2-1ubuntu9.1

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