Usb Dvd-rom Stays On Problem

**debugger** · 06-21-2006, 02:08 AM

I can't figure out why the light on the external USB 2.0 DVD-ROM drive stays on when the computer is complete off. I don't wan't it to drain those 5V when the whole system is off. Is there a setting in the AWARD BIOS?

It powers itself only from single USB ( there is only one usb cable!).
Any suggestions?
Thanks!

**DarquePervert** · 06-21-2006, 06:50 AM

Some power supplies continue to power USB wven when the rest of the system is off.
It would help to know what your setup is and how it's powered.

**debugger** · 06-21-2006, 09:30 PM

Originally Posted by DarquePervert

Some power supplies continue to power USB wven when the rest of the system is off.
It would help to know what your setup is and how it's powered.

LV-673 (award bios) mothrerboard (4 usb 2.0 ports in the back)
- right now its powered from ac-dc adapter straight to the motherboard, but I'll be using m2-atx psu for the car, so the ACPI behavior mightbe different when its hooked up...

Lite On DVD-ROM usb 2.0 (powered by the same cable/only one)
usb 2.0 keyboard and mouse
7" mp3car.com motorized single din LCD touchscreen

-all of these are connected to usb 2.0, those 4 ports in the back of the board

Pretty much I need to find a way so the keyboard, mouse, dvd-rom, touchscreen would not draw any power when the carputer is complete off, and when in standby mode, ONLY to draw signal from the mouse and touchscreen in order to bring the system up from standby.

**rcdash** · 06-25-2006, 10:49 PM

Use a hub, then put a relay on the USB red wire and on the hub power line.

Then when computer power goes to zero, those two power lines get disconnected.

**debugger** · 06-25-2006, 10:52 PM

Originally Posted by rcdash

Use a hub, then put a relay on the USB red wire and on the hub power line.

Then when computer power goes to zero, those two power lines get disconnected.

I might leave the usb 5v hub in self-powered state, I'll just put a on/off switch on the (+) wire of the hub cable.