My last Lenovo laptop had a setting in the BIOS for exactly that. Worked great for hotel rooms (which notoriously have very few power plugs) when I wanted to charge my cell phone and other devices over night. No clue about other vendors. Hope that helps, Adam -----Original Message----- From: Matthias Flittner [mailto:matthias.flittner@de-cix.net] Sent: Thursday, May 20, 2010 6:15 PM To: nanog@nanog.org Subject: Off-Topic: use laptop only as USB power supply -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi there, I'm not sure if anyone out there has an answer to this insane question: But is it possible to use my laptop only has power supply via usb for my mobile phone. Yes you heard right: I don't want to boot an operating system I only want to charge my battery of my mobile phone. No fan should be powered on. I only need voltage on the USB ports. Any suggestions? ;) best regards, FliTTi -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJL9bR2AAoJEIZn8Rym6s4A1TgH+gNSd8TRW34dvzgS03uTHKvi iZ3f+nciMeaJSN7Pq9Eugi3pgGvljKArcCiEmlV95BIP1i6hJiDuO7sOp/xx4yeO n8/iW6FyPBv5pqjuyhuTjs4GuG7ar4lM6/y4sYPT++bf5fWfwxjonYnmZakw2IVa 3fdsHeOIoyD45lirthSXXmynl/UO4ajYEwI+dqs2vpYcUYTgBW4WhQ1zMnVKJasn PtpuMx1M3a3xF3rFZ6PZ2KmtVRQhjpgaU1TYZO2jcABoKS9e7s2j5zFR+0nhIqzK hq2mQWGlA49Lgt+P21jsaJ8YZxD4AvZFnDXg3flR/FFTVIfVcWoQELvnWwv9iqs= =k+ae -----END PGP SIGNATURE-----