Dmesg:
[  234.150064] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, switching to polling mode: last cmd=0x20bf8100
[  234.282146] hpet1: lost 7161 rtc interrupts
[  235.153049] snd_hda_intel 0000:00:0e.0: No response from codec, disabling MSI: last cmd=0x20bf8100
[  235.185477] hpet1: lost 7160 rtc interrupts
[  236.089129] hpet1: lost 7161 rtc interrupts
[  236.156054] snd_hda_intel 0000:00:0e.0: azx_get_response timeout, switching to single_cmd mode: last cmd=0x20bf8100
[  236.156245] snd_hda_codec_hdmi hdaudioC0D2: HDMI: failed to get afg sub nodes
[  236.156891] snd_hda_codec_hdmi: probe of hdaudioC0D2 failed with error -22
[  236.209541] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[  236.210835] sd 0:0:0:0: [sda] Stopping disk
[  236.560753] ------------[ cut here ]------------
[  236.560755] Power well 2 on.
[  236.560825] WARNING: CPU: 1 PID: 1474 at drivers/gpu/drm/i915/intel_runtime_pm.c:455 bxt_enable_dc9+0xf2/0x120 [i915]
[  236.560828] Modules linked in: snd_hda_intel i915 vgem snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic btusb btrtl btbcm btintel x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel bluetooth ecdh_generic snd_hda_codec snd_hwdep snd_hda_core r8169 snd_pcm mii mei_me mei i2c_hid pinctrl_geminilake pinctrl_intel prime_numbers [last unloaded: i915]
[  236.560902] CPU: 1 PID: 1474 Comm: kworker/u8:6 Tainted: G     U            4.17.0-rc5-CI-CI_DRM_4179+ #1
[  236.560904] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
[  236.560911] Workqueue: events_unbound async_run_entry_fn
[  236.560956] RIP: 0010:bxt_enable_dc9+0xf2/0x120 [i915]
[  236.560958] RSP: 0018:ffffc90000857d88 EFLAGS: 00010286
[  236.560962] RAX: 0000000000000000 RBX: ffff88020f710000 RCX: 0000000000000001
[  236.560965] RDX: 0000000080000001 RSI: ffffffff821228a9 RDI: 00000000ffffffff
[  236.560967] RBP: 0000000000000000 R08: 000000008bafc4f0 R09: 0000000000000000
[  236.560969] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880275da8008
[  236.560972] R13: ffffffff81505f60 R14: 0000000000000000 R15: 0000000000000000
[  236.560975] FS:  0000000000000000(0000) GS:ffff88027fc80000(0000) knlGS:0000000000000000
[  236.560977] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  236.560979] CR2: 00007f26b6526068 CR3: 000000025d850000 CR4: 0000000000340ee0
[  236.560981] Call Trace:
[  236.561026]  i915_drm_suspend_late+0x119/0x120 [i915]
[  236.561035]  dpm_run_callback+0x5d/0x2f0
[  236.561041]  __device_suspend_late+0xad/0x140
[  236.561046]  async_suspend_late+0x15/0x90
[  236.561050]  async_run_entry_fn+0x34/0x160
[  236.561056]  process_one_work+0x229/0x6a0
[  236.561065]  worker_thread+0x35/0x380
[  236.561072]  ? process_one_work+0x6a0/0x6a0
[  236.561075]  kthread+0x119/0x130
[  236.561079]  ? _kthread_create_on_node+0x60/0x60
[  236.561085]  ret_from_fork+0x3a/0x50
[  236.561097] Code: 15 64 f7 e0 0f 0b e9 69 ff ff ff 80 3d 4c da 1f 00 00 0f 85 79 ff ff ff 48 c7 c7 2d 57 25 a0 c6 05 38 da 1f 00 01 e8 ee 63 f7 e0 <0f> 0b e9 5f ff ff ff 80 3d 24 da 1f 00 00 0f 85 5f ff ff ff 48 
[  236.561217] irq event stamp: 3352
[  236.561222] hardirqs last  enabled at (3351): [<ffffffff810f8997>] vprintk_emit+0x4b7/0x4d0
[  236.561226] hardirqs last disabled at (3352): [<ffffffff81a0111c>] error_entry+0x7c/0x100
[  236.561229] softirqs last  enabled at (3154): [<ffffffff81c0032b>] __do_softirq+0x32b/0x4e1
[  236.561234] softirqs last disabled at (3147): [<ffffffff8108b954>] irq_exit+0xa4/0xb0
[  236.561277] WARNING: CPU: 1 PID: 1474 at drivers/gpu/drm/i915/intel_runtime_pm.c:455 bxt_enable_dc9+0xf2/0x120 [i915]
[  236.561279] ---[ end trace 6bf7ef771ba6aef1 ]---
[  236.662958]  cache: parent cpu1 should not be sleeping
[  236.753215] sd 0:0:0:0: [sda] Starting disk


Full logs at:

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4179/shard-glk8/igt@drv_suspend@fence-restore-untiled.html