yes, same here. it is very common for laptops to have terrible ground loop problems when connected to other equipment, which is what you are hearing. the two solutions i can think of: a ) use a DI box between your laptop audio output and everything else to lift the signal off ground--an expensive option if you are just using the headphone out, of course! or b ) find another way to remove your laptop from ground. using batteries is one, but then your processor slips into a lower mode and you lose some of that computing power you paid for. a friend suggested using a powerstrip that either has no ground or has had its ground removed. haven't tried it yet, but that sounds like the best bet. better than hacking the grounds off your AC adaptor, at least... :-) best, derek juto aviten wrote: > Dear friends , > i have also problem with hum when i used sound with my laptop, it's > the plug, when i used only battery, it's perfect... but when i put > directly electricity... it's finish, i have a big hum and it's > terrible when you make sound or playing live... but i think it's an > hardware problem not software. But is someone find a solution (without > the fact to buy an external card) as for example find another AC > adaptater...??? Mylaptop is Gericom and i use Mandrake 9.0... if > you've got an idea, your just welcoming... and thanks you. > > > best > > > juto >
