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krandrtray helps us to mirror a desktop to an external display, however, if the external display has a small resolution than the desktop, then the external display can just show a part of content of the desktop. When we demonstrate our products to others, we usually replace the external display with a projector which almost has a smaller resolution, we can just show a part of our product at once. Therefore, we have to change the resolution of the desktop to match the projector, all information will be showed with an ugly layout, it isn't a good choice.

We shouldn't change the resolution of the desktop, but scale the desktop to the projector .

Conclusion: We should map the whole desktop to the external display which has different resolution.

i voted for this because i was present in two presentations (from a laptop with kde) and i saw that it tooks a while for the person to set up the right resolution for his presentation.
* I ve never try to do this by my self to see what it needs

I suffer from that problem very often.
voted for.

Nice idea, but shouldn't that be implemented in X?

I don't know where it should be implemented, I just hope krandrtray can support it , whether or not X has implemented it

The User wrote:Nice idea, but shouldn't that be implemented in X?

There is a feature called Twinview. With this you can use 2 screens with different resolutions, the beamer and the desktop.

I submitted a related idea (brainstorm.php?mode=idea&i=39358) in which new monitor/projector would always show scaled version of current desktop (clone view) and then allow you to change the desktop on a per monitor basis.

If you are referring to the desktop, I posted a bugs.kde.org idea about this a couple of years ago. If you are referring to windows or the screen, this has to be handled by your video driver (either xrandr 1.2+ or nvidia twinview).