[Abner78]

Hello everybody...

Now this is a strange one: I have an ION 330 with Xbmcbuntu. It has 2 ports: VGA and HDMI. I use VGA for projector and HDMI for TV.
I have only one cable connected every time. I don 't use them simultaneously.

Everything fine with TV and HDMI, but when I use the vga port this happen:

A) I use a 1,5 mt long cable to connect it to the projector, everything is fine, resolution is up to 1024x768

B) I use a 10 mt long cable to connect: I can get 640x480 max resolution.

The cable seems fine (every pin ok) : if I boot with the 1,5mt cable, wait till xbmc is loaded and then change it with the 10 mt long, there is no problem and I can still see the video on the projector, so the cable is not faulty.

Can someone explain me why is that and how to correct it?

[dibsta]

Hi dont know if this helps just found it on google

A VGA cable carries an analog signal,
and the maximum length decreases as the resolution goes up.
so,
1024x768 can run effectively over a 9 meter (30 ft) cable

[Abner78]

so,
1024x768 can run effectively over a 9 meter (30 ft) cable

Did you you mean "can't"?

But, as I written before: if I "lie" to it with the short cable, there is no problem switching the 2 cables after boot... seems only a recognition problem by xbmc (xorg?)

[thd042]

Sounds like either the response signal from the monitor gets spoiled by the cable length, or maybe your long cable has not all pins connected through? A short search on EDID revealed which data gets tranmitted, but I did not quite figure out how...
http://en.wikipedia.org/wiki/Extended_di...ation_data
http://en.wikipedia.org/wiki/I%C2%B2C

[bobo1on1]

The ddc signal probably gets distorted because of the long cable, you can add a modeline to xorg.conf to configure the vga output to 1024x768 permanently, no matter what the EDID says.