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Bug#816094: linux-image-4.4.0-1-amd64: Hangs (crashes ?) under xorg when an external screen is plugged in the VGA video output

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On Sat, 27 Feb 2016 12:48:56 +0100 =?iso-8859-1?Q?S=E9bastien?= Ducoulombier <seb@ldd.fr> wrote:
> Package: src:linux
> Version: 4.4.2-3
> Severity: important
> 
> Dear Maintainer,
> 
> 
> I have an external screen plugged into the VGA socket of my laptop.
> I rebooted to use the newly installed 4.4 Linux image.
> GDM still works, I can log in, but then while the X session starts,
> the system freezes : the mouse pointer is stuck.
> Pressing NumLock does does not update its LED.
> 
> Possible workarounds : either
>  - do not attempt to start an X session, press Ctrl+Alt+F1 to stay in textmode
>  - or unplug the external VGA screen and only use the laptop screen
>  - or use linux-image-4.3.0-1-amd64
> 
> Starting the X session THEN pluging in the external screen works for a few
> seconds, then this same bug occurs again.
> 
> This issue is not specific to Gnome, I tried with Gnome Classic and XFCE and
> got the very same behaviour. Gnome on Wayland seems usable for a few seconds,
> one can open a few windows, then the screens blink a few times, then the linux
> kernel crashes.
[...]

Please provide a log of the crash.  You can use netconsole or a serial
console to capture kernel output if it's not visible on-screen.  If it
*is* visible on-screen then send a photograph to the bug address.

Ben.

-- 
Ben Hutchings
The most exhausting thing in life is being insincere. - Anne Morrow Lindberg

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Bug#816094: linux-image-4.4.0-1-amd64: Hangs (crashes ?) under xorg when an external screen is plugged in the VGA video output Sébastien Ducoulombier <seb@ldd.fr> - 2016-02-27 13:10 +0100
  Bug#816094: linux-image-4.4.0-1-amd64: Hangs (crashes ?) under xorg when an external screen is plugged in the VGA video output Ben Hutchings <ben@decadent.org.uk> - 2016-03-07 20:40 +0100
    Bug#816094: linux-image-4.4.0-1-amd64: Hangs (crashes ?) under xorg when an external screen is plugged in the VGA video output Sébastien Ducoulombier <seb@ldd.fr> - 2016-03-09 15:50 +0100
  Processed: Re: linux-image-4.4.0-1-amd64: Hangs (crashes ?) under  xorg when an external screen is plugged in the VGA video output owner@bugs.debian.org (Debian Bug Tracking System) - 2016-03-07 20:40 +0100
  Bug#816094: marked as done (linux-image-4.4.0-1-amd64: Hangs  (crashes ?) under xorg when an external screen is plugged in the VGA video  output) owner@bugs.debian.org (Debian Bug Tracking System) - 2016-04-19 23:40 +0200

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