Bug#769569: [gnome-control-center] Connect/Disconnect to dual monitor setup restarts GNOME

[Adnan Hodzic]

Hey intrigeri,

Hi Adnan,

>Adnan Hodzic wrote (19 Nov 2014 16:34:57 GMT) :
>>>However, what would be most interesting is the log for the failing
>>>mode this bug is primarily about, that is disconnecting the external
>>>monitor while GNOME is running, and seeing the session
>>>being restarted. May you please attach this information?
>
>> Sure please see:
>> https://hodzic.org/img/boot-case-dual-monitor.txt
>
>> ^ Plugged in to the docking station: Boot > Log in > Suspend
>
>> Disconnected the notebook from docking station and we have a GNOME
restart.
>
>> Log in > sudo journalctrl -ab
>
>> Hopefully this will be enough for further analysis, in meantime if you
need
>> anything else please let me know.
>
>Now I'm confused. Your initial bug report was about simply
>disconnecting the external monitor *while GNOME is running*, and
>I understood it was the case without any suspend/resume cycle.
>Did I misunderstand?

You did misunderstand. Every time I did this I would suspend the computer
then unplug it from the docking station, just as I explained in description
of my reports.

>If I got it right, what would be good to have is:
>
>  1. cold boot, plugged into the docking station with external monitor
>  2. log into GNOME
>  3. unplug the external monitor
>  4. if it crashes, log in again, and send the Journal

While computer is plugged in to docking station. If I disconnect one
screen, GNOME will still be running it will "resize" itself to one screen.
However, when I disconnect the second screen. Screen on computer goes
blank, whole system becomes absolutely unresponsive and there's nothing I
can do with it anymore. Undocking computer at this point won't change
anything.

I can't restart GNOME (Alt+PrintScrn+K) or even go to virtual consoles
(Ctrl+Alt+F1/F6). Only thing that remains in this scenario is cold reset.

>  1. cold boot, plugged into the docking station with external monitor
>  2. log into GNOME
>  3. disconnect from the docking station
>  4. if it crashes, log in again, and send the Journal

As expected it crashed:
https://hodzic.org/img/5-case-dual-monitor.txt

> Undocking laptops while they're suspended has historically been
> fragile on a number of machines, so I'm not surprised that it causes
> problems on yours.

Ok good to know. Regardless if I do suspend and then undock the computer,
or undock it without suspending it first I get same results.


Let me know if you need anything else.

Thanks,

Adnan
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