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Monitor load on laptop
I have a second laptop I'm adding into the mix of equipment at our church. I have an A/B switch to connect it to the left projector. Unfortunately, during experimentation, there is a lot of lag when I flip the switch as the laptop suddenly senses something is connected to the port and switches the port on.
Short of using a splitter cable and connecting one side to a second monitor and the other to the projector, is there a simpler way anyone knows of to trick the PC into believing it's already connected to the projector so the switch becomes instant?
advTHANKSandBLESSINGSance for any info! Rick
We solved a similiar problem by attaching the laptop directly to a VGA distribution amplifier and then connecting the DA on to the projector.
In your case, you could connect the DA to your A/B switch. The laptop should sense the DA and think there is a monitor connected.
Milton SDB Church
"...if we are to glorify God fully, we must engage our mind in knowing him truly and our hearts in loving him duly." - John Piper, Think
We just got a couple of powered a/b switches to get around that problem. A while back I wired up a 15pin d-sub connector to provide feedback to the laptop, and put that on one end of the splitter cable, instead of a monitor. I found the instructions on google - had to solder 3 resistors between the right pins.
There are two kinds of A/B switches, most simple ones are just a 15 gang mechanical switch. The result is as you have discovered, can mean delays when you switch computers.
The other kind of switch, has what is commonly called a keep alive circuit, this appears to the connected devices like there is something there, even when there isn't. The more you spend, the more features the switch has, some will be able to pass on the video attributes of the switched device, so that the computers will be in the proper graphics mode when the switch is operated. Some will contain amplifiers to extend the reach, others are able to output SDI or Cat5 to extend past HDMI's 35' and VGA's 100' limits.
While a simple switch can be had for $20, more complex switches are a lot more, which can bring down the wrath of the finance committee, especially when they don't understand the difference between a $20 switch and a $2,000 switch.