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kern info: [drm] failed to find VBIOS tables

I've installed HEAD from nycdn to Panasonic Let's Note CF-SX2,
(20190105 version, and also checked with 201901111600Z).

In sysinst, screen gets blank, but extenal VGA works.
After installation, also LCD does not come out, but extenal VGA

The part of dmesg is below and
Full dmesg:

NetBSD 8.99.30 (GENERIC) #0: Sat Jan  5 10:51:06 UTC 2019 amd64

| kern info: [drm] failed to find VBIOS tables
| i915drmkms0: interrupting at ioapic0 pin 16 (i915drmkms0)
| warning: /usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_display.c:1603: PCH LVDS enabled on transcoder A, should be disabled
| warning: /usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_pm.c:3726: WARN_ON(cstate-> != intel_crtc->active)warning: /usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_pm.c:2552: WARN_ON(!r->enable)warning: /usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_pm.c:2552: WARN_ON(!r->enable)intelfb0 at i915drmkms0
| intelfb0: framebuffer at 0xffffc100f5549000, size 1024x768, depth 32, stride 4096
| kern error: [drm:(/usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_fifo_underrun.c:230)cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A
| kern error: [drm:(/usr/src/sys/external/bsd/drm2/dist/drm/i915/intel_fifo_underrun.c:381)intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder A FIFO underrun
| wsdisplay0 at intelfb0 kbdmux 1: console (default, vt100 emulation), using wskbd0
| wsmux1: connecting to wsdisplay0

Thank you,
Makoto Fujiwara

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