This is the output of my xrandr:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
  1920x1080     59.93 +  60.00*  
  1680x1050     59.88   
  1280x1024     75.02    60.02   
  1280x960      60.00   
  1152x864      75.00   
  1024x768      75.03    60.00   
  832x624       74.55   
  800x600       75.00    60.32    56.25   
  640x480       75.00    59.94   
  720x400       70.08   
VGA-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
  1920x1080     60.00*+
  1680x1050     59.95   
  1600x900      60.00   
  1280x1024     75.02    60.02   
  1280x960      60.00   
  1152x864      75.00   
  1280x720      60.00   
  1152x720      59.97   
  1024x768      75.03    60.00   
  832x624       74.55   
  800x600       75.00    60.32   
  640x480       75.00    59.94

Before the updates, both screens were able to report maximum resolution and even the make/model.
Now that's only reported for the main (HDMI-connected) screen.

I attach a screenshot of the config window that I once used to make it work under KDE.

On 11 October 2017 at 11:18, Scott Sullivan via talk <talk@gtalug.org> wrote:


On October 11, 2017 10:19:28 AM EDT, ac via talk <talk@gtalug.org> wrote:
>On Wed, 11 Oct 2017 10:01:07 -0400
>Scott Sullivan via talk <talk@gtalug.org> wrote:.
>> Desktop implement UIs that talk to this functionality, and handle the
>
>> 'memory' of layouts. KDE's for example will remember transient
>> moinitor configureations, like my two different laptop docks at home
>> and work, and will restore the right layout for each, matching
>> against the Vendor IDs of the monitors.
>>
>Okay, but after a kernel update / distro update - no configs 'should
>have' been over written...
>
>as it seems there has been config changes (both screens are still
>working & mouse moves to both screens, etc etc)
>
Not necessarily. Software is free to mangle your configs at run time. Distro will knowingly or unknowingly push updates from the upstream that 'upgrade' preferences files in ways that don't roll back. Especially in desktop applications.

Firefox will be doing this with the 57 release as we learned last night.

But another factor is driver updates can also result in the Output names changing. I've seen this in my own laptop. Usually as the generic drives gets tweaked to be aware of the specific model.

In that case the old config doesn't match the remembered state and would reasonable fall back to defaults. And defaults are the convention of the person that wrote the software.
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