LCD flickers when connected to laptop

Hello, I have bought a laptop to replace my desktop system.
It is an ASUS X5DAB that has a dedicated HD 4570 GPU.

When I plug my 22" LCD into the DVI output of the laptop, I get a good picture, but the screen flickers. It looks as if I can see the actual screen refresh, moving from down and up.

I have read about this, and haven't found much info, just that there is some really expensive converter that can be bought that eliminates this. But seriously, there should be lots of people who have LCD monitors and use laptops without any industrial-class equipment. Why would manufacturers equip their low/middle-segment laptops with a DVI output, if it can't be used satisfactorily?

How do others solve this?

 

Does this still occur if you run your laptop on battery only?

 

Going to try that now.

 

The problem doesn't exist when I run it on battery.

But I need to have the laptop connected to power, because sometimes I work for many hours without a break.
Can something be done?

 

Try avoid having the laptop's AC cable and any of the monitor's cables touching each other. This reduces the effects for me.

Also, apparently it's something like a ground loop. So if you have an AC adaptor that doesn't have a ground pin, the effects won't be there.

 

Shot in the dark, but... do you have a line conditioner? It's something you put between the wall outlet and the device that cleans up the electricity coming from the wall. Devices sometimes use the ocillation of the power from the wall to regulate the timing for things like refresh rate (in fact, that's why the US and Europe have different TV refresh rates; in Europe, the power grid runs at 50Hz, in the US it's 60Hz), so if your power is dirty, it could be skrewing up your monitor. More high end UPS units often come with line conditioners built in.

 

Thanks for your answers.

Putting the cables apart didn't help much, just a little.

The AC cable does have a ground pin. Can I solve this by connecting it to a normal socket instead of a grounded one, or by buying an AC cable without a ground pin?

 

You definitely don't want to unground it. That shouldn't help anything, I think, and just increases the risk should you get hit by a power spike.

 

Okay.

So since ungrounding doesn't help, and separating the cables doesn't help much, what can I do?

I take it that most laptops have this problem, so shouldn't people already have managed to find a way to solve it?