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<p>Related (maybe) to this are these messages in dmesg:</p>
<p>vgapci0: <VGA-compatible display> port 0x5000-0x503f mem 0xe0000000-0xefffffff,0xf0000000-0xf03fffff irq 16 at device 2.0 on pci0<br />[drm] pdev: vendor=0x8086 device=0x0126 rev=0x09<br />[drm] svendor=0x17aa sdevice=0x21da irq=17<br />WARN_ON(domain->wake_count == 0)error: [drm:pid0:gen6_gmch_probe] *ERROR* Can't set DMA mask/consistent mask (-5)<br />[drm] Memory usable by graphics device = 2048M<br />[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).<br />[drm] Driver supports precise vblank timestamp query.<br />tunable drm.video.LVDS-1 is not set<br />tunable drm.video.VGA-1 is not set<br />tunable drm.video.HDMI-A-1 is not set<br />tunable drm.video.DP-1 is not set<br />tunable drm.video.HDMI-A-2 is not set<br />tunable drm.video.HDMI-A-3 is not set<br />tunable drm.video.DP-2 is not set<br />tunable drm.video.DP-3 is not set<br />RPM wakelock ref not held during HW access<4>RPM wakelock ref not held during HW access<6>[drm] taking over the fictitious range 0xe0000000-0x10000000<br />[drm] Initialized i915 1.6.0 20171023 for dev_name on minor 0<br />kms console: xpixels 1366 ypixels 768<br />WARNING !set->fb failed at /usr/src/sys/dev/drm/drm/../drm_atomic_helper.c:2750<br />WARNING state->crtc && !state->fb failed at /usr/src/sys/dev/drm/drm/../drm_atomic.c:862<br />[drm] DRM_I915_DEBUG_GEM enabled<br />drm0 on vgapci0</p>
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<p>They are labeled "WARNINGS", but maybe more serious?</p>
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