[linux-audio-user] hum from laptop soundcard

[juto aviten]

derek holzer wrote:

> 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... :-)

Thanks Derek,
i will try some of this solutions

best

juto