linux-kernel - Re: [BUG] i915 HDMI connector status is connected after disconnection

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Date:   Thu, 05 Jul 2018 11:58:57 +0300
From:   Jani Nikula <jani.nikula@...el.com>
To:     Chris Chiu <chiu@...lessm.com>, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, David Airlie <airlied@...ux.ie>
Cc:     intel-gfx@...ts.freedesktop.org,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: [BUG] i915 HDMI connector status is connected after disconnection

On Thu, 05 Jul 2018, Chris Chiu <chiu@...lessm.com> wrote:
> 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" log is here.
> https://gist.github.com/mschiu77/d761d7c5cf191b7868d4d7788ae087f1
>
> 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

Seems rather odd. Please file a bug report at [1]. Attach the dmesg on
the bug. Please attach 'xrandr --verbose' output before and after
unplugging on the bug.

Please also try drm-tip branch of [2].

BR,
Jani.


[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
[2] https://cgit.freedesktop.org/drm/drm-tip


-- 
Jani Nikula, Intel Open Source Graphics Center