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Re: Thinkpad T440s with built-in display + external monitor

Hi Andre
  I have a T440s and had a similar problem. However, at least in my
case, the solution was quite simple: the built-in screen is not blank,
only its brightness is reduced to 0 (for some stupid reason) when an
external monitor (or in my case a beamer) is connected. 
In order to bring your built-in screen 'back', simply increase its
brightness with the F6 function key. 
At least this worked for me.


PS: let me know if this solution worked for you too.

On Wed, 2015-04-08 at 10:06 +0200, André Pinto wrote: 
> Also, I don't know if that is relevant or not, but I'm using the Mini
> DisplayPort connector to connect to the external monitor.
> On Wed, Apr 8, 2015 at 10:03 AM, André Pinto
> <andredasilvapinto@gmail.com> wrote:
>         Hi,
>         I'm having problems with having both the built-in display of
>         my Thinkpad T440s and an external monitor working. If I boot
>         the system without the external monitor connected, the
>         built-in display works, but as soon as I connect the external
>         monitor the external monitor starts working and the built-in
>         display goes blank. If I boot with the external monitor
>         connected, the initial boot screens (bios, grub...) show up on
>         the built-in display but as soon as I get to the GDM login
>         screen it goes blank and only the external monitor works.
>         In any of these cases, even if I disconnect the external
>         monitor after the built-in display stops working, it doesn't
>         start working again (i.e. it is not "re-enabled").
>         Both of the displays are properly enabled in the Displays
>         configuration screen (I've tried with both primary-secondary
>         and secondary-primary configurations, the problem is the
>         same).
>         Do you have any ideas about how can I solve this problem? Is
>         it a known issue with the T440s? 
>         This is the debian version that I'm using:
>         3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64
>         GNU/Linux
>         Thanks in advance,
>         André.

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