Currently I am using vga2usb device for interacting with vga device. vga2usb device is actually VGA frame grabber capable of capturing output from virtually any VGA source—such as a Windows PC, a Mac OSX, a Unix machine, an embedded system, a medical device.
To use this device we have to require relative drivers installed. These drivers are interacting with Video4Linux (V4L).
Now I have to detect that connected VGA device is active or not. (i.e device is in sleep mode or not).
So I have a question how can I find that VGA device is active and sending the VGA signals.
I am using Ubuntu 12.10 for this.