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

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Message-ID: <CAB4CAwci_Q873hjS86GSvKCqoBdvV6drACNEVi6eM=jYRHTZhw@mail.gmail.com>
Date:   Thu, 5 Jul 2018 21:30:29 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Jani Nikula <jani.nikula@...el.com>
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        David Airlie <airlied@...ux.ie>,
        joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        intel-gfx@...ts.freedesktop.org,
        Linux Upstreaming Team <linux@...lessm.com>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [BUG] i915 HDMI connector status is connected after disconnection

On Thu, Jul 5, 2018 at 9:18 PM, Jani Nikula <jani.nikula@...el.com> wrote:
> On Thu, 05 Jul 2018, Chris Chiu <chiu@...lessm.com> wrote:
>> On Thu, Jul 5, 2018 at 5:37 PM, Jani Nikula <jani.nikula@...el.com> wrote:
>>> On Thu, 05 Jul 2018, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>>> Quoting Jani Nikula (2018-07-05 09:58:57)
>>>>> 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.
>>>>
>>>> Note that 'xrandr --verbose' will trigger a reprobe of the devices,
>>>> papering over any missed probe following hotplug.  I would suggest
>>>> preceding with 'xrandr --current --verbose'.
>>>>
>>>> If all you are doing is checking status, you need to 'echo detect >
>>>> status' to trigger a reprobe after hotplug.
>>
>> It's interesting that reprobe triggered by 'xrandr --verbose' after unplug will
>> get the status back to "disconnected". But if I just do 'xrandr
>> --current --verbose'
>> before and after unplugging the cable, the output shows the same status
>> 'connected'.
>>
>> Here's the output of 'xrandr --verbose' before unplugging HDMI
>> https://gist.github.com/mschiu77/ea2e843078297f344596243418dcdaf7
>>
>> And the output of 'xrandr --current --verbose' after unplugging the cable
>> https://gist.github.com/mschiu77/55756c0801046d49cd9bc3f87712b079
>>
>> Then do 'xrandr --current --verbose' to trigger reprobe, the ouput
>> https://gist.github.com/mschiu77/72e6ab5438cbe64443300fc4fd71770c
>>
>> It means that the HDMI unplug not detected by the driver?
>
> Please do file the bug, and attach the information there. People go on
> vacations, the pastebins will go away, and the memory of all of this
> will fade.
>

Sorry that I missed to list here. I've reported the bug as follows
https://bugs.freedesktop.org/show_bug.cgi?id=107125

Thanks

> BR,
> Jani.
>
>>
>> Chris
>>
>>>
>>> I was curious about the logs seemingly indicating that we can read the
>>> EDID even after the user says they've unplugged the cable. The updating
>>> of sysfs status attribute is another matter.
>>>
>>> BR,
>>> Jani.
>>>
>>>
>>> --
>>> Jani Nikula, Intel Open Source Graphics Center
>
> --
> Jani Nikula, Intel Open Source Graphics Center