Laptops and external VGA
From openSUSE
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Configuration
If you want to connect your laptop to projectors using the external VGA plug, you just have to configure your secondary output:
1. Start sax2 (or start yast2 and click on Hardware/Graphics Card).
2. Enable Activate Dual Head Mode and click on Configure.
3. Make sure that Cloned Multihead is checked.
4. Select a monitor from the --> VESA or --> LCD vendor with 60Hz and the maximum resolution you want to drive the projector with (e.g. 1024x768@60Hz).
5. Select the same Second Monitor Resolution.
6. Press OK in both dialogs to accept your changes and let sax2 save your configuration.
7. Restart your Xserver (e.g. press Ctrl-Alt-Backspace)
You should now be able to plug in a projector in your external VGA plug and choose the right resolution e.g. with krandr.
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Caveats
There are a couple of possible issues:
* If your monitor is not detected correctly, you should switch to runlevel 3 with init 3 while working on a console, and start configuration with sax2 -r. Make sure that no monitor/projector is connected on the external VGA plug during this process.
* Only laptops with ATI, Intel, and NVidia chips will be supported.
* On laptops with Intel chips, up to and including SUSE Linux 10.1 only cloned setup is supported. There are no such restrictions with openSUSE 10.2.
* NVidia grapics chips:
The open source driver nv does not support secondary outputs at all.
* ATI graphics chip, using open source driver (radeon):
Using up to SUSE Linux 10.1, do not connect a monitor/projector to your external VGA while starting the computer or the Xserver, but plug in the projector only after startup. This issue is already solved in the driver based on current CVS code, so you might want to test the radeon10b driver (substitute radeon by radeon10b in your /etc/X11/xorg.conf), or openSUSE 10.2.
On SL10.0 you might want to try the resolution in this bugzilla comment, using the CVS based driver. Note that these drivers might have other issues like missing support for X600.
* ATI graphics chip, using binary only driver (fglrx):
Though not supported by SUSE, configuration in sax2 will most likely work. The driver does not have any issues with connected monitors during X startup.
If you are using a laptop with high resolution display (e.g. 1600x1200), you might have to specify a lower resolution for the secondary output in order to be able to have 1024x768 be displayed correctly.
* Connecting the projector using an external DVI plug:
In this case you most probably have to change /etc/X11/xorg.conf by hand.
http://en.opensuse.org/Laptops_and_external_VGA
Porque no te tranquilizas.
Luego repasa la configuración del desktop que funciona ok, comparándola con la problemática laptop y, lo transcribes aquí en detalle.
