Dinamically switch between Xinerama and Multiseat

[Kārlis Repsons]

On Monday 24 November 2008 16:29:12 Tobias Kaminsky wrote:
> Hello,
>
> I have 2 TFTs with each 1280x1024.
> Normally I work alone on the pc -> Xinerama.
> But sometimes my girlfriend wants to work on the pc, too. But I do not want
> to log out, change KDM and log in again.
>
> So I need something that works on the fly.
>
> Here is what I have this far:
>
> 1) Starting X across both TFTs.
> 2) DISPLAY=:0 Xephyr :1 -br +xinerama -screen 2560x1024
> This lets me have one big screen where I can load KDM.
> 3) DISPLAY=:1 xrandr -s 1280x1024 lets me change the size to one TFT.
>
> 3.1) Starting another Xephyr on the other TFT with a small Window Manager
> is no big deal.
> ----> Two Xephyr, one one each TFT
>
> Now "backwards":
> Closing one Xephyr.
>
> 4) DISPLAY=:1 xrandr -s 2560x1024
> Not a supported mode any longer.
>
> This is my problem. Starting Xephyr with 2560x1024 works fine.
> But after resizing it, the maximum resolution is 1600x1200.
>
> Also adding a new modeline does not help as it is accepted for the first
> time but not being displayed nor possible to select it.
>
> Any suggestions would be nice.
Well, maybe you will have to get 3rd display? I am in a similar problematic 
and this looks like best thing to do... Additionally, you won't have to do 
all the movement each time your girlfriend needs a PC. Just an extra screen, 
which will mostly be unused. Choice is yours.
You can* also start that Xephyr maximised on second screen - Xinerama supports 
it! Should work fine, if your girlfried makes no security threat to you :) 
(in a case when you have to leave your session open)
* is an indirect conclusion, which has some assumptions

I am currently slowly testing those things, so not many questions I can 
answer, just some ideas.

Regards

>
> ------
> xrandr-1.2.3
> xorg-server-1.5.2
>
> Portage 2.2_rc15 (default/linux/amd64/2008.0, gcc-4.3.2,
> glibc-2.8_p20080602- r0, 2.6.27.6 x86_64)
> System uname:
> Linux-2.6.27.6-x86_64-AMD_Phenom-tm-_9850_Quad-Core_Processor-
> with-glibc2.2.5
> ------
>
> Thanks
> Tobi
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