vlc-playing DVD won't display on external monitor

[Robert P. J. Day]

Quoting Paulo Cavalcanti <promac at gmail.com>:

> On Thu, Oct 23, 2008 at 2:10 PM, Robert P. J. Day   
> <rpjday at crashcourse.ca>wrote:
>
>>  ok, as a followup to my previous post, i slapped f9 on
>> my inspiron, then VLC and associated RPMs, popped in a DVD,
>> it plays nicely on the laptop.
>>
>>  then, connected an external (samsung WUXGA) flat-panel
>> monitor via DVI, and the entire laptop display is reflected
>> nicely on the monitor *except* for the actual DVD image in
>> the VLC window -- that just shows up as blank, either in
>> regular or fullscreen mode (in fullscreen mode, the entire
>> external display is blank, even while the movie is playing
>> on the laptop).
>>
>>  i'm no expert at video so, somehow, the DVD image is
>> not being passed out on DVI, while everything else is.
>> thoughts?  is there a VLC setting to tweak this?  this is
>> a dell inspiron 9200 so it's a fairly old system -- at
>> least a couple years.  but until now, running external
>> displays off that DVI port has worked just fine.  so
>> why is the DVD video content being treated this way?
>>
>>
> I do not think it is a problem with vlc. There should be a video overlay
> issue:
>
> http://en.wikipedia.org/wiki/Video_overlay
>
> What graphics card and which driver do you have?

   duh.

   # xrandr --output DVI-0 --auto
   # xrandr --output LVDS --off

rday