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
