On Wed, Nov 17, 2010 at 8:42 PM, John Jason Jordan <[email protected]> wrote:
> On Wed, 17 Nov 2010 19:33:25 -0800
> Bill Barry <[email protected]> dijo:
>
>>There is nothing special about testing it with a projector. You could
>>just test it with any external monitor as long as it can handle the
>>same resolution you will be using with the projector.
>
> That is why I wish I knew what the projector in 86-01 is capable of.

In most cases now, you can plug in an external display device and then
run 'xrandr' to see the list of supported resolutions for all
connected devices, whether they are displaying or not.  Then it's just
a matter of knowing the xrandr command line voodoo:

I use something like this:

$ xrandr --output LVDS --mode 1280x800 --output VGA --mode 1024x768

although,

$ xrandr --auto

usually works well enough.

If you want to mirror the same thing on both displays, then you need
the --same-as <device name> flag, and you need to specify modes that
both devices support. eg:

$ xrandr --output LVDS --mode 1024x768 --output VGA --mode 1024x768
--same-as LVDS

--Rogan






> But even if I knew, at home I have only the monitor on my laptop. And
> what if the video chip in the laptop can drive my laptop monitor at
> 1680 x 1050, but does not have sufficient poop to drive an external
> monitor at greater than a certain (lesser) resolution at the same time?
>
> There is no substitute for in situ testing, especially considering that
> the documentation for xrandr is pathetic.
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