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[Bug 1597895] Re: i915 crashes, lightdm unresponsive and VT switching impossible

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Hajo Möller <1597895@xxxxxxxxxxxxxxxxxx>
Date: Mon, 04 Jul 2016 15:11:47 -0000
Reply-to: Bug 1597895 <1597895@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
If I remember correctly the issue appeared shortly before 16.04 was
released, but I may have overlooked it before.

I will test the latest upstream kernel once I find time to create a
fresh installation on some other media, this system boots off ZFS and
thus doesn't work with 4.7 as of now.

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https://bugs.launchpad.net/bugs/1597895

Title:
  i915 crashes, lightdm unresponsive and VT switching impossible

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Some times after locking the screen and waking it up some time later
  via Fn (XF86WakeUp) lightdm accepts no input and Ctrl+Alt+Fx no longer
  work to switch to another VT.

  This is not always reproducible but I think it's triggered by clicking
  on lightdm's login dialog before it's ready.

  What usually happens when I wake up the screen:
  - the screen shows the lightdm dialog without a blinking cursor for a second
  - screen turns black (off?) for a second, as if its resolution changes
  - screen comes back, shows lightdm dialog, cursor begins to blink

  I will try to reproduce by clicking on the dialog before the screen
  goes black soon.

  This may be related to https://bugs.launchpad.net/ubuntu/+source
  /xserver-xorg-video-intel/+bug/1568604 - which affects my
  installation, too.

  Here's the relevant snippet from /var/log/syslog, I pressed the power
  button a few seconds after realizing the lock up:

  Jun 30 16:24:26 sbooblehat lightdm[4225]: ** (lightdm:4225): WARNING **: Error using VT_WAITACTIVE 7 on /dev/tty0: Interrupted system call
  Jun 30 16:24:26 sbooblehat org.gtk.vfs.Daemon[16609]: A connection to the bus can't be made
  Jun 30 16:24:28 sbooblehat acpid: client 16583[0:0] has disconnected
  Jun 30 16:24:29 sbooblehat systemd[1]: Started Getty on tty6.
  Jun 30 16:24:46 sbooblehat systemd[1]: Stopping User Manager for UID 108...
  Jun 30 16:24:46 sbooblehat systemd[16595]: Reached target Shutdown.
  Jun 30 16:24:46 sbooblehat systemd[16595]: Starting Exit the Session...
  Jun 30 16:24:46 sbooblehat systemd[16595]: Stopped target Default.
  Jun 30 16:24:46 sbooblehat systemd[16595]: Stopped target Basic System.
  Jun 30 16:24:46 sbooblehat systemd[16595]: Stopped target Paths.
  Jun 30 16:24:46 sbooblehat systemd[16595]: Stopped target Timers.
  Jun 30 16:24:46 sbooblehat systemd[16595]: Stopped target Sockets.
  Jun 30 16:24:46 sbooblehat systemd[16595]: Received SIGRTMIN+24 from PID 19198 (kill).
  Jun 30 16:24:46 sbooblehat systemd[1]: Stopped User Manager for UID 108.
  Jun 30 16:24:46 sbooblehat systemd[1]: Removed slice User Slice of lightdm.
  Jun 30 16:25:01 sbooblehat CRON[19216]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  Jun 30 16:29:41 sbooblehat acpid: client connected from 19395[0:0]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257132] ------------[ cut here ]------------
  Jun 30 16:29:41 sbooblehat kernel: [23583.257170] WARNING: CPU: 2 PID: 4240 at /build/linux-BvkamA/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]()
  Jun 30 16:29:41 sbooblehat kernel: [23583.257170] vblank wait timed out on crtc 0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257206] Modules linked in: rfcomm xt_CHECKSUM iptable_mangle ipt_REJECT nf_reject_ipv4 xt_tcpudp ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs bnep qmi_wwan cdc_wdm usbnet mii nls_iso8859_1 arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth qcserial usb_wwan usbserial intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi snd_hda_codec_conexant ath9k snd_hda_codec_generic ath9k_common ath9k_hw snd_hda_intel snd_hda_codec input_leds snd_hda_core joydev snd_hwdep ath serio_raw mac80211 snd_pcm cfg80211 lpc_ich thinkpad_acpi nvram snd_seq_midi snd_seq_midi_event mei_me shpchp mei snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore 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 lp sunrpc parport autofs4 zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd i2c_algo_bit drm_kms_helper syscopyarea psmouse e1000e sysfillrect sdhci_pci sysimgblt sdhci fb_sys_fops ahci drm libahci ptp pps_core wmi fjes video
  Jun 30 16:29:41 sbooblehat kernel: [23583.257257] CPU: 2 PID: 4240 Comm: Xorg Tainted: P           OE   4.4.0-28-generic #47-Ubuntu
  Jun 30 16:29:41 sbooblehat kernel: [23583.257258] Hardware name: LENOVO 4173AM4/4173AM4, BIOS 8CET59WW (1.39 ) 04/29/2015
  Jun 30 16:29:41 sbooblehat kernel: [23583.257262]  0000000000000286 0000000036d2e1e7 ffff8803d1c9f838 ffffffff813eb1a3
  Jun 30 16:29:41 sbooblehat kernel: [23583.257264]  ffff8803d1c9f880 ffffffffc007eae8 ffff8803d1c9f870 ffffffff81081102
  Jun 30 16:29:41 sbooblehat kernel: [23583.257265]  ffff880404860800 0000000000000000 0000000000000000 000000000000137a
  Jun 30 16:29:41 sbooblehat kernel: [23583.257266] Call Trace:
  Jun 30 16:29:41 sbooblehat kernel: [23583.257273]  [<ffffffff813eb1a3>] dump_stack+0x63/0x90
  Jun 30 16:29:41 sbooblehat kernel: [23583.257277]  [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257279]  [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
  Jun 30 16:29:41 sbooblehat kernel: [23583.257283]  [<ffffffff810c3805>] ? finish_wait+0x55/0x70
  Jun 30 16:29:41 sbooblehat kernel: [23583.257298]  [<ffffffffc004f2e5>] drm_wait_one_vblank+0x1b5/0x1c0 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257301]  [<ffffffff810c3ca0>] ? wake_atomic_t_function+0x60/0x60
  Jun 30 16:29:41 sbooblehat kernel: [23583.257336]  [<ffffffffc02e6cba>] intel_atomic_commit+0x43a/0x6f0 [i915]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257354]  [<ffffffffc0068c17>] drm_atomic_commit+0x37/0x60 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257364]  [<ffffffffc018c6ff>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257381]  [<ffffffffc00674aa>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257389]  [<ffffffffc018e8d3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257396]  [<ffffffffc018e94d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257424]  [<ffffffffc02fbb0a>] intel_fbdev_set_par+0x1a/0x60 [i915]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257428]  [<ffffffff8146e56f>] ? fb_set_var+0x2ef/0x460
  Jun 30 16:29:41 sbooblehat kernel: [23583.257430]  [<ffffffff8146e4b6>] fb_set_var+0x236/0x460
  Jun 30 16:29:41 sbooblehat kernel: [23583.257432]  [<ffffffff816fff17>] ? sock_poll+0x107/0x120
  Jun 30 16:29:41 sbooblehat kernel: [23583.257435]  [<ffffffff81222a16>] ? do_sys_poll+0x146/0x560
  Jun 30 16:29:41 sbooblehat kernel: [23583.257437]  [<ffffffff810b4d49>] ? update_curr+0x79/0x160
  Jun 30 16:29:41 sbooblehat kernel: [23583.257440]  [<ffffffff814647af>] fbcon_blank+0x30f/0x350
  Jun 30 16:29:41 sbooblehat kernel: [23583.257442]  [<ffffffff810ab139>] ? ttwu_do_wakeup+0x19/0xe0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257445]  [<ffffffff814fb8d3>] do_unblank_screen+0xd3/0x1a0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257448]  [<ffffffff814f09a9>] complete_change_console+0x59/0xe0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257450]  [<ffffffff814f1140>] vt_ioctl+0x710/0x12f0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257463]  [<ffffffffc004d779>] ? drm_ioctl+0x189/0x540 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.257466]  [<ffffffff814e440f>] tty_ioctl+0x35f/0xc40
  Jun 30 16:29:41 sbooblehat kernel: [23583.257468]  [<ffffffff8146d9bf>] ? brightness_store+0xef/0x120
  Jun 30 16:29:41 sbooblehat kernel: [23583.257470]  [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
  Jun 30 16:29:41 sbooblehat kernel: [23583.257472]  [<ffffffff8120f751>] ? __sb_end_write+0x21/0x30
  Jun 30 16:29:41 sbooblehat kernel: [23583.257475]  [<ffffffff8120d35d>] ? vfs_write+0x15d/0x1a0
  Jun 30 16:29:41 sbooblehat kernel: [23583.257477]  [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
  Jun 30 16:29:41 sbooblehat kernel: [23583.257479]  [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Jun 30 16:29:41 sbooblehat kernel: [23583.257481] ---[ end trace c0963e93b69d104f ]---
  Jun 30 16:29:41 sbooblehat kernel: [23583.357210] ------------[ cut here ]------------
  Jun 30 16:29:41 sbooblehat kernel: [23583.357260] WARNING: CPU: 2 PID: 4240 at /build/linux-BvkamA/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]()
  Jun 30 16:29:41 sbooblehat kernel: [23583.357262] vblank wait timed out on crtc 1
  Jun 30 16:29:41 sbooblehat kernel: [23583.357329] Modules linked in: rfcomm xt_CHECKSUM iptable_mangle ipt_REJECT nf_reject_ipv4 xt_tcpudp ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs bnep qmi_wwan cdc_wdm usbnet mii nls_iso8859_1 arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth qcserial usb_wwan usbserial intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi snd_hda_codec_conexant ath9k snd_hda_codec_generic ath9k_common ath9k_hw snd_hda_intel snd_hda_codec input_leds snd_hda_core joydev snd_hwdep ath serio_raw mac80211 snd_pcm cfg80211 lpc_ich thinkpad_acpi nvram snd_seq_midi snd_seq_midi_event mei_me shpchp mei snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore 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 lp sunrpc parport autofs4 zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd i2c_algo_bit drm_kms_helper syscopyarea psmouse e1000e sysfillrect sdhci_pci sysimgblt sdhci fb_sys_fops ahci drm libahci ptp pps_core wmi fjes video
  Jun 30 16:29:41 sbooblehat kernel: [23583.357422] CPU: 2 PID: 4240 Comm: Xorg Tainted: P        W  OE   4.4.0-28-generic #47-Ubuntu
  Jun 30 16:29:41 sbooblehat kernel: [23583.357424] Hardware name: LENOVO 4173AM4/4173AM4, BIOS 8CET59WW (1.39 ) 04/29/2015
  Jun 30 16:29:41 sbooblehat kernel: [23583.357431]  0000000000000286 0000000036d2e1e7 ffff8803d1c9f838 ffffffff813eb1a3
  Jun 30 16:29:41 sbooblehat kernel: [23583.357435]  ffff8803d1c9f880 ffffffffc007eae8 ffff8803d1c9f870 ffffffff81081102
  Jun 30 16:29:41 sbooblehat kernel: [23583.357438]  ffff880404860800 0000000000000001 0000000000000000 0000000000088b40
  Jun 30 16:29:41 sbooblehat kernel: [23583.357439] Call Trace:
  Jun 30 16:29:41 sbooblehat kernel: [23583.357452]  [<ffffffff813eb1a3>] dump_stack+0x63/0x90
  Jun 30 16:29:41 sbooblehat kernel: [23583.357461]  [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
  Jun 30 16:29:41 sbooblehat kernel: [23583.357466]  [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
  Jun 30 16:29:41 sbooblehat kernel: [23583.357474]  [<ffffffff810c3805>] ? finish_wait+0x55/0x70
  Jun 30 16:29:41 sbooblehat kernel: [23583.357504]  [<ffffffffc004f2e5>] drm_wait_one_vblank+0x1b5/0x1c0 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357510]  [<ffffffff810c3ca0>] ? wake_atomic_t_function+0x60/0x60
  Jun 30 16:29:41 sbooblehat kernel: [23583.357581]  [<ffffffffc02e6cba>] intel_atomic_commit+0x43a/0x6f0 [i915]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357621]  [<ffffffffc0068c17>] drm_atomic_commit+0x37/0x60 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357640]  [<ffffffffc018c6ff>] restore_fbdev_mode+0x22f/0x260 [drm_kms_helper]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357677]  [<ffffffffc00674aa>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357694]  [<ffffffffc018e8d3>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357709]  [<ffffffffc018e94d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357768]  [<ffffffffc02fbb0a>] intel_fbdev_set_par+0x1a/0x60 [i915]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357775]  [<ffffffff8146e56f>] ? fb_set_var+0x2ef/0x460
  Jun 30 16:29:41 sbooblehat kernel: [23583.357779]  [<ffffffff8146e4b6>] fb_set_var+0x236/0x460
  Jun 30 16:29:41 sbooblehat kernel: [23583.357785]  [<ffffffff816fff17>] ? sock_poll+0x107/0x120
  Jun 30 16:29:41 sbooblehat kernel: [23583.357791]  [<ffffffff81222a16>] ? do_sys_poll+0x146/0x560
  Jun 30 16:29:41 sbooblehat kernel: [23583.357794]  [<ffffffff810b4d49>] ? update_curr+0x79/0x160
  Jun 30 16:29:41 sbooblehat kernel: [23583.357800]  [<ffffffff814647af>] fbcon_blank+0x30f/0x350
  Jun 30 16:29:41 sbooblehat kernel: [23583.357805]  [<ffffffff810ab139>] ? ttwu_do_wakeup+0x19/0xe0
  Jun 30 16:29:41 sbooblehat kernel: [23583.357811]  [<ffffffff814fb8d3>] do_unblank_screen+0xd3/0x1a0
  Jun 30 16:29:41 sbooblehat kernel: [23583.357817]  [<ffffffff814f09a9>] complete_change_console+0x59/0xe0
  Jun 30 16:29:41 sbooblehat kernel: [23583.357821]  [<ffffffff814f1140>] vt_ioctl+0x710/0x12f0
  Jun 30 16:29:41 sbooblehat kernel: [23583.357849]  [<ffffffffc004d779>] ? drm_ioctl+0x189/0x540 [drm]
  Jun 30 16:29:41 sbooblehat kernel: [23583.357854]  [<ffffffff814e440f>] tty_ioctl+0x35f/0xc40
  Jun 30 16:29:41 sbooblehat kernel: [23583.357859]  [<ffffffff8146d9bf>] ? brightness_store+0xef/0x120
  Jun 30 16:29:41 sbooblehat kernel: [23583.357863]  [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
  Jun 30 16:29:41 sbooblehat kernel: [23583.357868]  [<ffffffff8120f751>] ? __sb_end_write+0x21/0x30
  Jun 30 16:29:41 sbooblehat kernel: [23583.357873]  [<ffffffff8120d35d>] ? vfs_write+0x15d/0x1a0
  Jun 30 16:29:41 sbooblehat kernel: [23583.357877]  [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
  Jun 30 16:29:41 sbooblehat kernel: [23583.357883]  [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Jun 30 16:29:41 sbooblehat kernel: [23583.357886] ---[ end trace c0963e93b69d1050 ]---
  Jun 30 16:29:41 sbooblehat acpid: 1 client rule loaded
  Jun 30 16:29:44 sbooblehat kernel: [23586.937582] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... blitter ring idle
  Jun 30 16:29:45 sbooblehat systemd[1]: Created slice User Slice of lightdm.
  Jun 30 16:29:45 sbooblehat systemd[1]: Starting User Manager for UID 108...
  Jun 30 16:29:45 sbooblehat systemd[1]: Started Session c7 of user lightdm.
  Jun 30 16:29:45 sbooblehat systemd[19407]: Reached target Paths.
  Jun 30 16:29:45 sbooblehat systemd[19407]: Reached target Timers.
  Jun 30 16:29:45 sbooblehat systemd[19407]: Reached target Sockets.
  Jun 30 16:29:45 sbooblehat systemd[19407]: Reached target Basic System.
  Jun 30 16:29:45 sbooblehat systemd[19407]: Reached target Default.
  Jun 30 16:29:45 sbooblehat systemd[19407]: Startup finished in 31ms.
  Jun 30 16:29:45 sbooblehat systemd[1]: Started User Manager for UID 108.
  Jun 30 16:29:45 sbooblehat org.a11y.atspi.Registry[19430]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
  Jun 30 16:29:45 sbooblehat rtkit-daemon[4405]: Successfully made thread 19505 of process 19505 (n/a) owned by '108' high priority at nice level -11.
  Jun 30 16:29:45 sbooblehat rtkit-daemon[4405]: Supervising 4 threads of 2 processes of 2 users.
  Jun 30 16:29:46 sbooblehat rtkit-daemon[4405]: Supervising 4 threads of 2 processes of 2 users.
  Jun 30 16:29:46 sbooblehat rtkit-daemon[4405]: Successfully made thread 19518 of process 19505 (n/a) owned by '108' RT at priority 5.
  Jun 30 16:29:46 sbooblehat rtkit-daemon[4405]: Supervising 5 threads of 2 processes of 2 users.
  Jun 30 16:29:46 sbooblehat rtkit-daemon[4405]: Supervising 5 threads of 2 processes of 2 users.
  Jun 30 16:29:46 sbooblehat rtkit-daemon[4405]: Successfully made thread 19519 of process 19505 (n/a) owned by '108' RT at priority 5.
  Jun 30 16:29:46 sbooblehat rtkit-daemon[4405]: Supervising 6 threads of 2 processes of 2 users.
  Jun 30 16:35:01 sbooblehat CRON[19622]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  Jun 30 16:45:01 sbooblehat CRON[19830]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
  Jun 30 16:45:14 sbooblehat kernel: [24516.886663] ------------[ cut here ]------------
  Jun 30 16:45:14 sbooblehat kernel: [24516.886717] WARNING: CPU: 1 PID: 19395 at /build/linux-BvkamA/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]()
  Jun 30 16:45:14 sbooblehat kernel: [24516.886721] vblank wait timed out on crtc 0
  Jun 30 16:45:14 sbooblehat kernel: [24516.886724] Modules linked in: rfcomm xt_CHECKSUM iptable_mangle ipt_REJECT nf_reject_ipv4 xt_tcpudp ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs bnep qmi_wwan cdc_wdm usbnet mii nls_iso8859_1 arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth qcserial usb_wwan usbserial intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi snd_hda_codec_conexant ath9k snd_hda_codec_generic ath9k_common ath9k_hw snd_hda_intel snd_hda_codec input_leds snd_hda_core joydev snd_hwdep ath serio_raw mac80211 snd_pcm cfg80211 lpc_ich thinkpad_acpi nvram snd_seq_midi snd_seq_midi_event mei_me shpchp mei snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore 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 lp sunrpc parport autofs4 zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd i2c_algo_bit drm_kms_helper syscopyarea psmouse e1000e sysfillrect sdhci_pci sysimgblt sdhci fb_sys_fops ahci drm libahci ptp pps_core wmi fjes video
  Jun 30 16:45:14 sbooblehat kernel: [24516.886939] CPU: 1 PID: 19395 Comm: Xorg Tainted: P        W  OE   4.4.0-28-generic #47-Ubuntu
  Jun 30 16:45:14 sbooblehat kernel: [24516.886943] Hardware name: LENOVO 4173AM4/4173AM4, BIOS 8CET59WW (1.39 ) 04/29/2015
  Jun 30 16:45:14 sbooblehat kernel: [24516.886948]  0000000000000286 00000000fad3dc75 ffff8801f9097b08 ffffffff813eb1a3
  Jun 30 16:45:14 sbooblehat kernel: [24516.886955]  ffff8801f9097b50 ffffffffc007eae8 ffff8801f9097b40 ffffffff81081102
  Jun 30 16:45:14 sbooblehat kernel: [24516.886961]  ffff880404860800 0000000000000000 0000000000000000 00000000000014b0
  Jun 30 16:45:14 sbooblehat kernel: [24516.886967] Call Trace:
  Jun 30 16:45:14 sbooblehat kernel: [24516.886981]  [<ffffffff813eb1a3>] dump_stack+0x63/0x90
  Jun 30 16:45:14 sbooblehat kernel: [24516.886992]  [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
  Jun 30 16:45:14 sbooblehat kernel: [24516.886998]  [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
  Jun 30 16:45:14 sbooblehat kernel: [24516.887008]  [<ffffffff810c3805>] ? finish_wait+0x55/0x70
  Jun 30 16:45:14 sbooblehat kernel: [24516.887039]  [<ffffffffc004f2e5>] drm_wait_one_vblank+0x1b5/0x1c0 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887047]  [<ffffffff810c3ca0>] ? wake_atomic_t_function+0x60/0x60
  Jun 30 16:45:14 sbooblehat kernel: [24516.887118]  [<ffffffffc02e6cba>] intel_atomic_commit+0x43a/0x6f0 [i915]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887159]  [<ffffffffc0068c17>] drm_atomic_commit+0x37/0x60 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887180]  [<ffffffffc018bb16>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887215]  [<ffffffffc0057e42>] drm_mode_set_config_internal+0x62/0x100 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887250]  [<ffffffffc005c362>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887278]  [<ffffffffc004d742>] drm_ioctl+0x152/0x540 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887312]  [<ffffffffc005bf90>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24516.887321]  [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
  Jun 30 16:45:14 sbooblehat kernel: [24516.887329]  [<ffffffff8108e351>] ? __set_task_blocked+0x41/0xa0
  Jun 30 16:45:14 sbooblehat kernel: [24516.887336]  [<ffffffff81090ce6>] ? __set_current_blocked+0x36/0x60
  Jun 30 16:45:14 sbooblehat kernel: [24516.887341]  [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
  Jun 30 16:45:14 sbooblehat kernel: [24516.887348]  [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Jun 30 16:45:14 sbooblehat kernel: [24516.887354] ---[ end trace c0963e93b69d1051 ]---
  Jun 30 16:45:14 sbooblehat kernel: [24517.302656] ------------[ cut here ]------------
  Jun 30 16:45:14 sbooblehat kernel: [24517.302710] WARNING: CPU: 2 PID: 19395 at /build/linux-BvkamA/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]()
  Jun 30 16:45:14 sbooblehat kernel: [24517.302714] vblank wait timed out on crtc 1
  Jun 30 16:45:14 sbooblehat kernel: [24517.302718] Modules linked in: rfcomm xt_CHECKSUM iptable_mangle ipt_REJECT nf_reject_ipv4 xt_tcpudp ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter ip_tables xt_conntrack x_tables nf_nat nf_conntrack br_netfilter bridge stp llc aufs bnep qmi_wwan cdc_wdm usbnet mii nls_iso8859_1 arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth qcserial usb_wwan usbserial intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi snd_hda_codec_conexant ath9k snd_hda_codec_generic ath9k_common ath9k_hw snd_hda_intel snd_hda_codec input_leds snd_hda_core joydev snd_hwdep ath serio_raw mac80211 snd_pcm cfg80211 lpc_ich thinkpad_acpi nvram snd_seq_midi snd_seq_midi_event mei_me shpchp mei snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore 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 lp sunrpc parport autofs4 zfs(PO) zunicode(PO) zcommon(PO) znvpair(PO) spl(O) zavl(PO) btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd i2c_algo_bit drm_kms_helper syscopyarea psmouse e1000e sysfillrect sdhci_pci sysimgblt sdhci fb_sys_fops ahci drm libahci ptp pps_core wmi fjes video
  Jun 30 16:45:14 sbooblehat kernel: [24517.302932] CPU: 2 PID: 19395 Comm: Xorg Tainted: P        W  OE   4.4.0-28-generic #47-Ubuntu
  Jun 30 16:45:14 sbooblehat kernel: [24517.302936] Hardware name: LENOVO 4173AM4/4173AM4, BIOS 8CET59WW (1.39 ) 04/29/2015
  Jun 30 16:45:14 sbooblehat kernel: [24517.302941]  0000000000000286 00000000fad3dc75 ffff8801f9097b08 ffffffff813eb1a3
  Jun 30 16:45:14 sbooblehat kernel: [24517.302948]  ffff8801f9097b50 ffffffffc007eae8 ffff8801f9097b40 ffffffff81081102
  Jun 30 16:45:14 sbooblehat kernel: [24517.302953]  ffff880404860800 0000000000000001 0000000000000000 0000000000088c72
  Jun 30 16:45:14 sbooblehat kernel: [24517.302959] Call Trace:
  Jun 30 16:45:14 sbooblehat kernel: [24517.302973]  [<ffffffff813eb1a3>] dump_stack+0x63/0x90
  Jun 30 16:45:14 sbooblehat kernel: [24517.302984]  [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
  Jun 30 16:45:14 sbooblehat kernel: [24517.302990]  [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
  Jun 30 16:45:14 sbooblehat kernel: [24517.302999]  [<ffffffff810c3805>] ? finish_wait+0x55/0x70
  Jun 30 16:45:14 sbooblehat kernel: [24517.303030]  [<ffffffffc004f2e5>] drm_wait_one_vblank+0x1b5/0x1c0 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303039]  [<ffffffff810c3ca0>] ? wake_atomic_t_function+0x60/0x60
  Jun 30 16:45:14 sbooblehat kernel: [24517.303115]  [<ffffffffc02e6cba>] intel_atomic_commit+0x43a/0x6f0 [i915]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303158]  [<ffffffffc0068c17>] drm_atomic_commit+0x37/0x60 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303179]  [<ffffffffc018bb16>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303213]  [<ffffffffc0057e42>] drm_mode_set_config_internal+0x62/0x100 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303248]  [<ffffffffc005c362>] drm_mode_setcrtc+0x3d2/0x4f0 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303276]  [<ffffffffc004d742>] drm_ioctl+0x152/0x540 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303310]  [<ffffffffc005bf90>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Jun 30 16:45:14 sbooblehat kernel: [24517.303318]  [<ffffffff81220b6f>] do_vfs_ioctl+0x29f/0x490
  Jun 30 16:45:14 sbooblehat kernel: [24517.303326]  [<ffffffff8108e351>] ? __set_task_blocked+0x41/0xa0
  Jun 30 16:45:14 sbooblehat kernel: [24517.303333]  [<ffffffff81090ce6>] ? __set_current_blocked+0x36/0x60
  Jun 30 16:45:14 sbooblehat kernel: [24517.303338]  [<ffffffff81220dd9>] SyS_ioctl+0x79/0x90
  Jun 30 16:45:14 sbooblehat kernel: [24517.303344]  [<ffffffff818276b2>] entry_SYSCALL_64_fastpath+0x16/0x71
  Jun 30 16:45:14 sbooblehat kernel: [24517.303350] ---[ end trace c0963e93b69d1052 ]---
  Jun 30 16:45:49 sbooblehat systemd[1]: Unmounting RPC Pipe File System...
  Jun 30 16:45:49 sbooblehat systemd[1]: Stopping Authenticate and Authorize Users to Run Privileged Tasks...
  Jun 30 16:45:49 sbooblehat systemd[1]: Starting Unattended Upgrades Shutdown...
  Jun 30 16:45:49 sbooblehat systemd[1]: Stopping Manage, Install and Generate Color Profiles...
  Jun 30 16:45:49 sbooblehat systemd[1]: Closed Load/Save RF Kill Switch Status /dev/rfkill Watch.
  Jun 30 16:45:49 sbooblehat systemd[1]: Stopping Session c7 of user lightdm.
  Jun 30 16:45:49 sbooblehat obexd[5396]: Terminating
  Jun 30 16:45:50 sbooblehat systemd[1]: Stopping Session c2 of user dasjoe.
  Jun 30 16:45:50 sbooblehat ModemManager[2937]: <info>  Caught signal, shutting down...
  Jun 30 16:45:50 sbooblehat systemd[1]: Stopping User Manager for UID 108...
  Jun 30 16:45:50 sbooblehat ModemManager[2937]: [/dev/cdc-wdm0] Releasing 'pds' client with flags 'release-cid'...
  Jun 30 16:45:50 sbooblehat systemd[1]: Stopping Daemon for power management...
  Jun 30 16:45:50 sbooblehat ModemManager[2937]: [/dev/cdc-wdm0] Unregistered 'pds' client with ID '1'
  Jun 30 16:45:50 sbooblehat systemd[1]: Stopping RealtimeKit Scheduling Policy Service...
  Jun 30 16:45:50 sbooblehat rsyslogd: [origin software="rsyslogd" swVersion="8.16.0" x-pid="2934" x-info="http://www.rsyslog.com";] exiting on signal 15.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-28-generic 4.4.0-28.47
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  Uname: Linux 4.4.0-28-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dasjoe     5576 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Thu Jun 30 21:27:13 2016
  MachineType: LENOVO 4173AM4
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/ROOT/xenial@/boot/vmlinuz-4.4.0-28-generic root=ZFS=sbblht/ROOT/xenial ro quiet noplymouth
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-28-generic N/A
   linux-backports-modules-4.4.0-28-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/29/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8CET59WW (1.39 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4173AM4
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8CET59WW(1.39):bd04/29/2015:svnLENOVO:pn4173AM4:pvrThinkPadT420s:rvnLENOVO:rn4173AM4:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4173AM4
  dmi.product.version: ThinkPad T420s
  dmi.sys.vendor: LENOVO

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References

[Bug 1597895] [NEW] i915 crashes, lightdm unresponsive and VT switching impossible
From: Hajo Möller, 2016-06-30