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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 1586373

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

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https://bugs.launchpad.net/bugs/1586373

Title:
  drm_wait_one_vblank+0x17b/0x1c0

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  I'm using a new Skylake Thinkpad T460s with and external monitor
  connected via Displayport and Ubuntu 16.04, fully up to date and
  kernel Running kernel 4.6.0-040600rc7-generic from
  http://kernel.ubuntu.com/~kernel-ppa/mainline/ which resolved other
  more serious issues I've had with the i915 driver.

  The issue below appears to happen when I switch to text console and
  back to X.   Other than the kernel messages there doesn't appear to be
  an actual problem.

  [1418463.728144] ------------[ cut here ]------------
  [1418463.728199] WARNING: CPU: 2 PID: 1117 at /home/kernel/COD/linux/drivers/gpu/drm/drm_irq.c:1317 drm_wait_one_vblank+0x17b/0x1c0 [drm]
  [1418463.728202] vblank not available on crtc 0, ret=-22
  [1418463.728291] Modules linked in: uas usb_storage btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c drbg ansi_cprng ctr ccm md4 nls_utf8 cifs fscache mmc_block msr acpi_call(OE) pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev media snd_usb_audio snd_usbmidi_lib btusb btrtl btbcm btintel bluetooth binfmt_misc nls_iso8859_1 arc4 snd_hda_codec_hdmi snd_soc_skl snd_soc_skl_ipc iwlmvm snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core snd_hda_codec_realtek snd_soc_sst_match snd_hda_codec_generic mac80211 snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine dw_dmac_core iwlwifi snd_hda_intel snd_hda_codec intel_rapl snd_hda_core x86_pkg_temp_thermal cfg80211 intel_powerclamp coretemp
  [1418463.728367]  snd_hwdep joydev input_leds serio_raw snd_pcm rtsx_pci_ms memstick thinkpad_acpi nvram mei_me snd_seq_midi mei snd_seq_midi_event shpchp snd_rawmidi intel_pch_thermal snd_seq snd_seq_device snd_timer snd soundcore tpm_crb mac_hid kvm_intel kvm irqbypass parport_pc ppdev lp parport autofs4 algif_skcipher af_alg dm_crypt hid_generic hid_microsoft usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 nvme aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i2c_algo_bit drm_kms_helper e1000e syscopyarea psmouse sysfillrect sysimgblt ptp fb_sys_fops pps_core nvme_core drm rtsx_pci wmi video fjes
  [1418463.728375] CPU: 2 PID: 1117 Comm: Xorg Tainted: G        W  OE   4.6.0-040600rc7-generic #201605081830
  [1418463.728377] Hardware name: LENOVO 20F9CTO1WW/20F9CTO1WW, BIOS N1CET40W (1.08 ) 03/09/2016
  [1418463.728386]  0000000000000286 000000003e515057 ffff880502d43820 ffffffff813f2ea3
  [1418463.728392]  ffff880502d43870 0000000000000000 ffff880502d43860 ffffffff8108294b
  [1418463.728397]  0000052500000000 ffff88003546e800 0000000000000000 ffff880502904c00
  [1418463.728399] Call Trace:
  [1418463.728411]  [<ffffffff813f2ea3>] dump_stack+0x63/0x90
  [1418463.728420]  [<ffffffff8108294b>] __warn+0xcb/0xf0
  [1418463.728427]  [<ffffffff810829cf>] warn_slowpath_fmt+0x5f/0x80
  [1418463.728470]  [<ffffffffc0059754>] ? drm_vblank_get+0x74/0xc0 [drm]
  [1418463.728511]  [<ffffffffc00599ab>] drm_wait_one_vblank+0x17b/0x1c0 [drm]
  [1418463.728603]  [<ffffffffc0252220>] ? chv_write64+0x370/0x370 [i915]
  [1418463.728670]  [<ffffffffc0204bd5>] skl_update_wm+0x515/0x640 [i915]
  [1418463.728735]  [<ffffffffc020860e>] intel_update_watermarks+0x1e/0x30 [i915]
  [1418463.728821]  [<ffffffffc0274821>] haswell_crtc_enable+0x321/0x8c0 [i915]
  [1418463.728904]  [<ffffffffc02711bb>] intel_atomic_commit+0x5fb/0xdd0 [i915]
  [1418463.728966]  [<ffffffffc0072c31>] ? drm_atomic_check_only+0x181/0x600 [drm]
  [1418463.729026]  [<ffffffffc00730e7>] drm_atomic_commit+0x37/0x60 [drm]
  [1418463.729056]  [<ffffffffc0175cfe>] drm_fb_helper_pan_display+0x1de/0x240 [drm_kms_helper]
  [1418463.729137]  [<ffffffffc0286dea>] intel_fbdev_pan_display+0x1a/0x60 [i915]
  [1418463.729145]  [<ffffffff81479c8f>] fb_pan_display+0xcf/0x160
  [1418463.729151]  [<ffffffff81473e20>] bit_update_start+0x20/0x50
  [1418463.729156]  [<ffffffff81470f00>] fbcon_switch+0x3b0/0x640
  [1418463.729165]  [<ffffffff815068d7>] redraw_screen+0x177/0x240
  [1418463.729173]  [<ffffffff814fd44f>] complete_change_console+0x3f/0xe0
  [1418463.729179]  [<ffffffff814fdc00>] vt_ioctl+0x710/0x12f0
  [1418463.729186]  [<ffffffff814f1d1f>] tty_ioctl+0x35f/0xc80
  [1418463.729194]  [<ffffffff81237721>] do_vfs_ioctl+0xa1/0x5b0
  [1418463.729202]  [<ffffffff8106bc15>] ? __do_page_fault+0x205/0x4d0
  [1418463.729207]  [<ffffffff81237ca9>] SyS_ioctl+0x79/0x90
  [1418463.729215]  [<ffffffff81845476>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [1418463.729307] ---[ end trace 18c4708a5d4e21da ]---
  [1418463.781572] ------------[ cut here ]------------

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