Hi Raphael,
Thanks

I m using  Disper ( http://willem.engen.nl/projects/disper/ )

I would like automatize switch to external display when connected.


Using disper with infinite loop :-)

=========================================
*
*
*#!/bin/bash*
*while true ;  do*
*  if [ "$(disper -l | grep DFP-2 | wc -l)" = "1" ];  then*
*    disper -d DFP-2 -s*
*  else*
*    disper -d DFP-0 -s*
*  fi*
*
*
*  sleep 5*
*done*

=======================================
Regards
Lucas Zinato Carraro








On Tue, Oct 6, 2009 at 2:22 PM, Raphael Gradenwitz <
raph...@gradenwitz.ath.cx> wrote:

> Hello Lucas Zinato Carraro,
>
> Am Dienstag, den 06.10.2009, 00:30 -0300 schrieb Lucas Zinato Carraro:
> >    How  to detect when a External Monitor or HDMI cable is connected ?
> > ( ps: Using NVIDIA Card )
> >
> >
> > I try to find events like a  a hal or a dbus messages ......
>
> The DDC from your Display is connected and communicates only with the
> Graphic-Processor (using a kind of i2c channel).
> If you want to detect if a display was (newly) hotpluged to your nvidia
> gp, you have to detect it with the 'nvidia-settings' tool every time you
> plug new hardware. There is (imho!) no hal or dbus watching if new
> displays are connected nor the nvidia kernel module provides that
> information somewhere without initiating a detection process by hand (I
> did not find any)
>
>
> >      My laptop is VGN-Z540 and using "nvidia-settings", and disper  i
> > can switch between
> > VGA, Intenal LCD and HDMI.  I would like to automatize tasks when a
> > external display
> > is connected.
>
>       * Twin-View (two dsiplays on one big virtual display) can simply
>        be activated with nvidia-settings.
>      * Using two x-servers, for each display one (with or withou
>        Xinerama), requires a restart of the x-server after you saved
>        the settings to the xorg.conf:
>
> restarting the xserver (gdm):
>
>        On Karmic (using upstart):
>
>                sudo restart gdm
>
>        On other Systems (not yet using upstart):
>
>                sudo /etc/init.d./gdm restart
>
> Or you could write your own application; download the nvidia-settings
> source-code from here:
> https://launchpad.net/ubuntu/karmic/+source/nvidia-settings/180.25-0ubuntu1
> Open the source in an ide (like Geany) and search for
> "PROBE_DISPLAYS" (in whole project), there you can find the functions
> and used libs/headers which could inspire you in writing your own daemon
> which could provide the hooks you want.
>
> By the way: What do you want to automatize? How the X-Server should
> handle the different displays is explained in the README file from the
> driver
>
>
> http://de.download.nvidia.com/XFree86/Linux-x86_64/185.18.36/README/index.html
>
> specially in the Apendix C "Display Device Names":
>
>
> http://de.download.nvidia.com/XFree86/Linux-x86_64/185.18.36/README/appendix-c.html
>
> you can read how to handle such cases.
>
> After an X-Server (re)start, the connected Displays are detected.
>
> Just my 2 cents
>
> Regards,
> Raphael
>
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