This happens sporadically on boot, probably 40% on average.

The trace is from latest kernel, but I use 3.18 otherwise with which it occurs as well.

http://www.intel.com/content/www/us/en/nuc/nuc-kit-d34010wyk.html

[   14.951166] WARNING: CPU: 0 PID: 774 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:11259 intel_modeset_stage_output_state.isra.65+0x4aa/0x590 [i915]()
[   14.951169] WARN_ON(!set->fb && (set->num_connectors != 0))
[   14.951170] Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) snd_usb_audio snd_usbmidi_lib snd_hwdep intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel arc4 kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel iwldvm aesni_intel mac80211 aes_x86_64 lrw gf128mul glue_helper i915 snd_soc_rt5640 ablk_helper cryptd snd_soc_rl6231 iwlwifi drm_kms_helper snd_soc_core drm mei_me cfg80211 snd_compress snd_pcm_dmaengine mei i2c_algo_bit lpc_ich snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd nuvoton_cir dw_dmac rc_core dw_dmac_core soundcore i2c_hid snd_soc_sst_acpi i2c_designware_platform video 8250_dw i2c_designware_core spi_pxa2xx_platform mac_hid lp parport hid_generic usbhid hid uas ahci usb_storage libahci sdhci_acpi sdhci
[   14.951221] CPU: 0 PID: 774 Comm: gpu-manager Tainted: G           OE  3.19.0-994-generic #201412300205
[   14.951223] Hardware name:                  /D34010WYK, BIOS WYLPT10H.86A.0033.2014.1201.0940 12/01/2014
[   14.951225]  0000000000002bfb ffff88029252bb98 ffffffff817c443a 0000000000000007
[   14.951228]  ffff88029252bbe8 ffff88029252bbd8 ffffffff81076bf7 ffff88029252bbd8
[   14.951231]  ffff880291c13be0 ffff880290029300 ffff880291c13bf9 ffff880291c13bf9
[   14.951234] Call Trace:
[   14.951241]  [<ffffffff817c443a>] dump_stack+0x45/0x57
[   14.951246]  [<ffffffff81076bf7>] warn_slowpath_common+0x97/0xe0
[   14.951249]  [<ffffffff81076cf6>] warn_slowpath_fmt+0x46/0x50
[   14.951255]  [<ffffffff811d987c>] ? __kmalloc+0x1fc/0x260
[   14.951287]  [<ffffffffc05f354b>] ? intel_set_config_save_state+0x8b/0x1a0 [i915]
[   14.951319]  [<ffffffffc05f28ea>] intel_modeset_stage_output_state.isra.65+0x4aa/0x590 [i915]
[   14.951354]  [<ffffffffc0602e81>] intel_crtc_set_config+0x131/0x4e0 [i915]
[   14.951380]  [<ffffffffc05a1047>] ? intel_runtime_pm_put+0x57/0x60 [i915]
[   14.951409]  [<ffffffffc05bd159>] ? i915_gem_free_object+0x1a9/0x2f0 [i915]
[   14.951414]  [<ffffffff817cf0a8>] ? __ww_mutex_lock+0x28/0xad
[   14.951433]  [<ffffffffc04a8810>] ? drm_modeset_lock+0x40/0x100 [drm]
[   14.951447]  [<ffffffffc04991b6>] drm_mode_set_config_internal+0x66/0x110 [drm]
[   14.951456]  [<ffffffffc045b068>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
[   14.951464]  [<ffffffffc045cab0>] drm_fb_helper_restore_fbdev_mode_unlocked+0x30/0x80 [drm_kms_helper]
[   14.951498]  [<ffffffffc0610fde>] intel_fbdev_restore_mode+0x1e/0x50 [i915]
[   14.951533]  [<ffffffffc06379ee>] i915_driver_lastclose+0xe/0x20 [i915]
[   14.951543]  [<ffffffffc048bf3e>] drm_lastclose+0x2e/0x130 [drm]
[   14.951553]  [<ffffffffc048c278>] drm_release+0x238/0x420 [drm]
[   14.951557]  [<ffffffff811f78e0>] __fput+0xc0/0x250
[   14.951561]  [<ffffffff811f7abe>] ____fput+0xe/0x10
[   14.951565]  [<ffffffff81093d5f>] task_work_run+0xaf/0xf0
[   14.951569]  [<ffffffff81015077>] do_notify_resume+0xc7/0xd0
[   14.951573]  [<ffffffff817d1a0f>] int_signal+0x12/0x17
[   14.951576] ---[ end trace 4cc7bf3a3e150fc2 ]---
[   14.951696] fbcon: inteldrmfb (fb0) is primary device