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I was trying to plug projector on my laptop with slackware 13.1 installed. The problem is that the projector stops showing whenever I start X. I can see everything starting from LILO loader, but whenever I type "startx" - bam, no signal or just a black screen on the wall. I try to switch to console mode with ctrl+alt+f1 - the view appears, switching back to X with ctrl+alt+f7 - view disappears.
I am using awesome WM. I tried XFCE, but the result was the same. I also tried to change resolution to
xrandr --output default --mode 1024x768 / 800x600
, but again, no difference. My laptop is ASUS F3Jc. Fn keys doesn't help as well.
I use a projector with my Slackware 13.1 laptop running both KDE4 and XFCE. The key for me is the NVIDIA proprietary driver which will detect displays and allow you to configure them separately, so the internal lcd can be disabled and the external projector enabled, vice-versa or both can be configured to work in "TwinView". No doubt an expert in xorg configuration could do this without the nvidia driver, but if you have nvidia graphics that would be one way to fix your problem.
To do the switching usng the nvidia proprietary driver, you have to get the driver to install from the nvidia website (google linux driver nvidia). Once you have run the installation script you should see an nvidia driver icon / menu entry in kde / xfce or whatever you are using to start applications. That then gives you a fairly easy to use GUI interface to the driver including the various displays that it detects.
@Zoran119 - you are right of course - the SBo route is much better than just downloading from nvidia and running their install. I think in fact last time I installed, I did it that way too. Looks like OP has the driver anyway, so should be able to switch displays once driver gui is displayed.
Well, the problem was that after I plug the projector cable, in nvidia-settings by default that display is disabled. I need to enable it and select as clone of the existing screen every time. So that kinda solved the problem.