[Bug 92916] [BXT] [Audio] [HD-A Display] Can't light on HDMI and DP monitor if boot up without monitor connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92916

--- Comment #4 from Lu, Han <han.lu at intel.com> ---
Created attachment 119629
  --> https://bugs.freedesktop.org/attachment.cgi?id=119629&action=edit
dmesg with boot parameter drm.debug=14 and HDMI cable unconnected

Hi Jani,

Update:
With latest commit on drm-nightly repo, the issue is NOT reproduced on DP, but
still reproduced on HDMI. Please find dmesg log attached.
My platform is BXT-P RVP2B.

Reproduce steps:
1. Disconnect HDMI cable，boot up with parameter "drm.debug=14"
2. ssh to BXT
3. run "udevadm monitor --property --tag-match=HOTPLUG", output is
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
4. Plug on HDMI cable, no output on SSH interface
5. In ssh, dmesg > dmesg.log

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