I have a bunch of older USB devices that could simply be charged by plugging into a dumb USB power port on my laptop's power adapter. I now have two newer devices (Sony Minidisc MZ-RH1 and Motorola KRZR phone) that refuse to charge from a dumb port. They seem to require a regular handshake with a PC, negotiating their DC current requirements, before they will start charging. I find this pretty annoying because it means I now need a powered up PC (laptop) when I want to recharge these guys while I'm traveling, or I have to bring their proprietary chargers with me. (Whereas I usually just bring the laptop power supply and a set of plug adapters for wherever I'll be visiting.)
So my first question is - does anybody know of a "smart" USB dongle that can take power from a dumb USB power port, and can talk thru the required handshake to get these devices to enable their chargers? Next, I've occasionally seen some people complain that their phones start charging as soon as they plug into their laptop. In some cases, you don't want the phone sucking down whatever battery life is left in the laptop, you just want to do some stuff with the phone and let it draw down its own battery. This is the more Linux-oriented question - can you tweak the USB driver to ignore the power negotiation handshake? (I.e., I'm assuming that if the power negotiation fails, the device's charger will fail to kick in, but the rest of command communication should continue to operate.) -- -- Howard Chu Chief Architect, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/ ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
