Re: [dev] cloned screen setup broken

From: Anselm R Garbe <>
Date: Thu, 30 Aug 2012 20:01:48 +0200

Hi Jan,

On 18 August 2012 12:26, Jan Christoph Ebersbach <> wrote:
> Thanks to I discovered an interesting, I'd say broken,
> behavior when using dwm in a cloned screen setup, i.e. connect a laptop
> to a beamer. In the archives I only found this lengthy thread
> ( regarding the dual head
> setup but it doesn't focus on the cloned setup.
> The problem becomes evident when one of the two screen operates on a
> higher resolution than the other. In the following picture S1 is the
> beamer, S2 the laptop.
> +------+-------+
> |S1 |S2 |
> | | |
> +------+ |
> | |
> +--------------+
> First of all, the bar is drawn on both screens although just one bar
> needed to be drawn. This causes the visual effect of a truncated
> information area (where the selected window's title is drawn) on S2.
> The more annoying problems start when new windows are spawned on both
> screen. Because both screens have their own list of clients but share
> the same visible tag, the windows are drawn on top of each other. When
> the focus is on screen S1 it is also not possible to focus a
> window from the other screen S2, although it's also visible on S1.
> I guess it could be difficult to solve the issue within dwm, therefore I
> suggest the following guidelines for this setup:
> - use the same resolution on both screens (I guess this is a good
> idea in general)
> - never spawn windows on the other screen
> - and hide the bar on the other screen

Thanks for reporting this issue. It's on my TODO list now.

I hope to come up with a general multi-screen handling fix, as the
current state is quite unsatisfactory.

Best regards,
Received on Thu Aug 30 2012 - 20:01:48 CEST

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