Comment 51 for bug 1685442

Get a similar warning. I have bisected my problem to the following kernel patch:

commit edde361711ef8f396e401b25d970e329f68bec0b
Author: Maarten Lankhorst <email address hidden>
Date: Wed Feb 17 09:18:35 2016 +0100

    drm/i915: Use atomic state to obtain load detection crtc, v3.

    Instead of restoring dpms and a flag for whether a temp fb is allocated duplicate
    an atomic state before the new state is committed, and commit it the old state
    in intel_release_load_detect_pipe.

    Changes since v1:
    - Use a real atomic state. (Ville)
    Changes since v2:
    - Do not preserve shared_dpll any more, no need to do so. (Ville)

    Signed-off-by: Maarten Lankhorst <email address hidden>
    Reviewed-by: Ville Syrjälä <email address hidden>
    Link: http://patchwork.freedesktop.org<email address hidden>

This leads to the following dmesg warnings for me:

[ 10.613368] ------------[ cut here ]------------
[ 10.613396] WARNING: CPU: 0 PID: 89 at drivers/gpu/drm/drm_irq.c:1268 drm_wait_one_vblank+0x170/0x180 [drm]()
[ 10.613406] vblank wait timed out on crtc 0
[ 10.613412] Modules linked in: coretemp evdev input_leds psmouse serio_raw pcspkr snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_codec_generic lpc_ich mfd_core ssb mmc_core fan thermal wmi battery i915 snd_hda_intel i2c_algo_bit drm_kms_helper snd_hda_codec syscopyarea sysfillrect sysimgblt fb_sys_fops snd_hwdep hp_accel snd_hda_core lis3lv02d e1000e snd_pcm input_polldev led_class video snd_timer ptp drm intel_agp ac pps_core intel_gtt snd acpi_cpufreq soundcore agpgart button processor ip_tables x_tables ext4 crc16 mbcache jbd2 jitterentropy_rng sha256_generic hmac drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt dm_mod sr_mod cdrom sd_mod ata_generic pata_acpi atkbd libps2 ata_piix ahci libahci libata scsi_mod ehci_pci uhci_hcd ehci_hcd usbcore usb_common i8042 serio
[ 10.613531] CPU: 0 PID: 89 Comm: kworker/u4:4 Not tainted 4.5.0-rc3-AA-00365-gedde361 #32
[ 10.613540] Hardware name: Hewlett-Packard HP 550/3618, BIOS 68MVU Ver. F.02 08/20/2008
[ 10.613553] Workqueue: events_unbound async_run_entry_fn
[ 10.613560] 00000286 00000286 f478dba8 c12681cf f478dbe8 f8382c65 f478dbd8 c105502d
[ 10.613574] f8385128 f478dc04 00000059 f8382c65 000004f4 f835a620 f835a620 f441b000
[ 10.613587] 00000000 00000000 f478dbf0 c10550a3 00000009 f478dbe8 f8385128 f478dc04
[ 10.613600] Call Trace:
[ 10.613609] [<c12681cf>] dump_stack+0x58/0x79
[ 10.613616] [<c105502d>] warn_slowpath_common+0x8d/0xd0
[ 10.613628] [<f835a620>] ? drm_wait_one_vblank+0x170/0x180 [drm]
[ 10.613638] [<f835a620>] ? drm_wait_one_vblank+0x170/0x180 [drm]
[ 10.613645] [<c10550a3>] warn_slowpath_fmt+0x33/0x40
[ 10.613656] [<f835a620>] drm_wait_one_vblank+0x170/0x180 [drm]
[ 10.613665] [<c1091cc0>] ? wake_atomic_t_function+0x70/0x70
[ 10.613726] [<f8657452>] intel_get_load_detect_pipe+0x762/0x7e0 [i915]
[ 10.613774] [<f869412a>] intel_tv_detect+0x1aa/0x6d0 [i915]
[ 10.613786] [<f836eb05>] ? drm_get_edid+0x25/0x3e0 [drm]
[ 10.613798] [<f8393b80>] drm_helper_probe_single_connector_modes+0x2f0/0x520 [drm_kms_helper]
[ 10.613810] [<f83a0c88>] drm_fb_helper_initial_config+0x88/0x400 [drm_kms_helper]
[ 10.613854] [<f8669789>] intel_fbdev_initial_config+0x19/0x30 [i915]
[ 10.613862] [<c1072539>] async_run_entry_fn+0x49/0x170
[ 10.613870] [<c106ad6e>] process_one_work+0x1ae/0x410
[ 10.613877] [<c106b007>] worker_thread+0x37/0x490
[ 10.613883] [<c106afd0>] ? process_one_work+0x410/0x410
[ 10.613890] [<c10700cb>] kthread+0x9b/0xb0
[ 10.613899] [<c1494689>] ret_from_kernel_thread+0x21/0x38
[ 10.613905] [<c1070030>] ? kthread_worker_fn+0x130/0x130
[ 10.613912] ---[ end trace 1da52df1c4cdc7e7 ]---