4K monitors?

[don fisher]

On 07/03/14 21:13, Tim wrote:
> Allegedly, on or about 03 July 2014, don fisher sent:
>> I have a laptop that attach an external monitor to when I am at home.
>> Until today, it always came up in single screen mode, duplicated on
>> both monitors. I had a power failure, and now the system is treating
>> them as two monitors side by side. I am an old timer an prefer the
>> days of the xorg.conf setup. Any ideas on where the button for single
>> screen is hidden
>
> If you're using Gnome, there's a "displays" option in the system
> settings set of configurators, or a "screen resolution" item in one of
> the system menus, in it is a "mirror displays" option, which really
> means both displays show the same as each other, rather than showing a
> mirror (backwards) image.
>
> Most of these things are easy to find if people just look at the menus.
>
Do you know what file the setting are maintained in? I do not use Gnome 
and would like to be able to edit the appropriate files rather than 
being so dependent on GUI interfaces.

Thanks for any info,
Don