[ 180.835482] WARNING: CPU: 2 PID: 50 at sound/hda/hdac_i915.c:92 snd_hdac_display_power+0xd3/0xf0 [snd_hda_core]
[ 180.835489] Modules linked in: vgem snd_hda_intel i915 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec x86_pkg_temp_thermal intel_powerclamp snd_hwdep btusb coretemp snd_hda_core btrtl btbcm crct10dif_pclmul btintel crc32_pclmul bluetooth ghash_clmulni_intel snd_pcm e1000e ecdh_generic mei_me mei prime_numbers [last unloaded: i915]
[ 180.835523] CPU: 2 PID: 50 Comm: kworker/2:1 Tainted: G U 4.16.0-rc5-CI-CI_DRM_3935+ #1
[ 180.835524] Hardware name: /NUC7i5BNB, BIOS BNKBL357.86A.0054.2017.1025.1822 10/25/2017
[ 180.835528] Workqueue: pm pm_runtime_work
[ 180.835532] RIP: 0010:snd_hdac_display_power+0xd3/0xf0 [snd_hda_core]
[ 180.835533] RSP: 0018:ffffc900001f3d28 EFLAGS: 00010246
[ 180.835536] RAX: ffffffffa00bc360 RBX: ffff88027186c548 RCX: 00000000fffe2e7f
[ 180.835537] RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffff88027186c548
[ 180.835538] RBP: 0000000000000000 R08: ffff88027459d918 R09: 000000001c1639c9
[ 180.835540] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8802726bda98
[ 180.835541] R13: 0000000000000000 R14: ffff88026f58b3f8 R15: ffffffffa01ef810
[ 180.835542] FS: 0000000000000000(0000) GS:ffff88027ed00000(0000) knlGS:0000000000000000
[ 180.835544] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 180.835545] CR2: 000055c991db1778 CR3: 0000000005210004 CR4: 00000000003606e0
[ 180.835546] Call Trace:
[ 180.835552] hda_codec_runtime_suspend+0x74/0xa0 [snd_hda_codec]
[ 180.835555] __rpm_callback+0xb1/0x1e0
[ 180.835559] rpm_callback+0x1a/0x70
[ 180.835562] ? hda_codec_runtime_resume+0x40/0x40 [snd_hda_codec]
[ 180.835565] rpm_suspend+0x114/0x6d0
[ 180.835570] pm_runtime_work+0x9b/0xb0
[ 180.835573] process_one_work+0x215/0x620
[ 180.835579] worker_thread+0x48/0x3a0
[ 180.835582] ? _raw_spin_unlock_irqrestore+0x4c/0x60
[ 180.835586] kthread+0xfb/0x130
[ 180.835588] ? process_one_work+0x620/0x620
[ 180.835589] ? _kthread_create_on_node+0x30/0x30
[ 180.835592] ret_from_fork+0x3a/0x50
[ 180.835599] Code: 00 00 e8 c1 fe ff ff 48 89 df 31 f6 e8 b7 fe ff ff 89 e8 5b 5d 41 5c c3 49 8b 44 24 20 49 8b 3c 24 ff 50 10 89 e8 5b 5d 41 5c c3 <0f> 0b c7 83 50 05 00 00 ff ff ff ff e9 68 ff ff ff bd ed ff ff 
[ 180.835669] WARNING: CPU: 2 PID: 50 at sound/hda/hdac_i915.c:92 snd_hdac_display_power+0xd3/0xf0 [snd_hda_core]
[ 180.835670] ---[ end trace 88dd5b2592df6ee4 ]---

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3935/shard-kbl5/igt@pm_rpm@gem-pread.html