[Bug 107125] New: [i915] HDMI connector status is connected after disconnection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107125

            Bug ID: 107125
           Summary: [i915] HDMI connector status is connected after
                    disconnection
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chiu at endlessm.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140473
  --> https://bugs.freedesktop.org/attachment.cgi?id=140473&action=edit
Full dmesg log with drm.debug=0xe

Hi,
    We have few ASUS laptops X705FD (The new WiskyLake), X560UD (intel
i5-8250U), X530UN (intel i7-8550U) share the same problem, which is
the HDMI connector status stays connected even the HDMI cable has been
unplugged. Look into the "/sys/class/drm/card0-HDMI-A-1/status" for
checking the status while plug/unplug the HDMI, it shows
"disconnected" before plug in HDMI cable, then switch to "connected"
after plugin, and still stay "connected" after unplug. This would
cause the audio output path cannot correctly switch from HDMI to
internal speaker after unplugging the HDMI.

I then try to verify with the latest kernel 4.18.0-rc3+, the bug still
present. The full "dmesg" attached.

The HDMI cable is plugged in at ~26th second.
"[ 26.214371] [drm:drm_detect_monitor_audio [drm]] Monitor has basic
audio support"
then unplug the HDMI at ~73th second.
"[ 73.328361] [drm:drm_detect_monitor_audio [drm]] Monitor has basic
audio support"


Please advise what I can do to fix this. Thanks

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