[Bug 86736] [hsw] Intel haswell NUC i915.fastboot=1 makes no difference to boot speed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86736

--- Comment #2 from xnox <dimitri.j.ledkov at intel.com> ---
(In reply to Chris Wilson from comment #1)
> [    0.476617] [drm] VT-d active for gfx access
> [    0.484163] [drm] DMAR active, disabling use of stolen memory
> 
> so it is not going to be able to preserve the BIOS framebuffer and mode. But
> 
> [    0.489956] [drm:intel_modeset_readout_hw_state] [CRTC:7] hw state
> readout: disabled
> [    0.489962] [drm:intel_modeset_readout_hw_state] [CRTC:11] hw state
> readout: disabled
> [    0.489965] [drm:intel_modeset_readout_hw_state] [CRTC:15] hw state
> readout: disabled
> [    0.489968] [drm:intel_modeset_readout_hw_state] WRPLL 1 hw state
> readout: refcount 0, on 0
> [    0.489971] [drm:intel_modeset_readout_hw_state] WRPLL 2 hw state
> readout: refcount 0, on 0
> [    0.489974] [drm:intel_modeset_readout_hw_state] [ENCODER:17:TMDS-17] hw
> state readout: disabled, pipe A
> [    0.489977] [drm:intel_modeset_readout_hw_state] [ENCODER:22:TMDS-22] hw
> state readout: disabled, pipe A
> [    0.489979] [drm:intel_modeset_readout_hw_state] [ENCODER:24:DP MST-24]
> hw state readout: disabled, pipe A
> [    0.489981] [drm:intel_modeset_readout_hw_state] [ENCODER:25:DP MST-25]
> hw state readout: disabled, pipe B
> [    0.489983] [drm:intel_modeset_readout_hw_state] [ENCODER:26:DP MST-26]
> hw state readout: disabled, pipe C
> [    0.489986] [drm:intel_modeset_readout_hw_state] [CONNECTOR:18:HDMI-A-1]
> hw state readout: disabled
> [    0.489988] [drm:intel_modeset_readout_hw_state] [CONNECTOR:23:DP-1] hw
> state readout: disabled
> [    0.489991] [drm:intel_modeset_readout_hw_state] [CONNECTOR:27:HDMI-A-2]
> hw state readout: disabled
> 
> everything is regarded as off anyway.

Hm I see. Well the Dell monitor I have is eager to go into "sleep mode" and
thus not actually showing the firmware bootsplash often. I did the following -
unplug DP cable, plug it in and quickly poweron the NUC. This way the
firmware/uefi splash is shown, then i get loads of screen flicker then I boot
to Basic System and dmesg is printed on the screen... but dracut fails to
complete the boot as things are not detected (e.g. disk/by-uuid not present)
anyway i ran udevadm trigger to fix that, complete boot and I'll see if the
dmesg / fastboot improves.

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