0
votes
1answer
51 views

Can't a USB hub power keyboard and mouse at same time?

I'm trying to use a Dell mouse and keyboard via a single USB port using the USB splitter hub, but the devices seem to misbehave. Just one of the devices work when I connect both. I figured out it's a ...
1
vote
1answer
56 views

Can Current Backflow from Powered Hub's Adapter & cause PC Damage?

Getting this short: Can current flow from a powered USB hub's power adapter (lying 10 Meter away) back to computer via usb port and cause damage to Computer components like mobo, etc? What should be ...
0
votes
1answer
49 views

Gaming keyboard G265 not responsive and backlight keeps flashing

My new Genius G265 gaming keyboard is not responsive and keeps flashing the backlight. In Windows I hear repeating ding sounds as if I removed the keyboard and plugged it back in. If I manage to turn ...
2
votes
1answer
69 views

Power capabilities of USB 3.0 vs 2.0?

I'm currently buying some new USB micro cables for my Samsung Galaxy S5. It supports both USB 2.0 micro and USB 3.0 micro connectors. Will I see better charging times when using the USB 3.0 cable ...
9
votes
6answers
1k views

USB backlit keyboard power consumption

Does someone know the power consumption of an USB backlit keyboard like the SteelSeries Apex? I'd like to connect it to a Keyboard/Mouse USB Switch that goes to PC by one USB 2.0 cable. The mouse I'm ...
1
vote
1answer
153 views

Can USB 2.0 power a USB 3.0 external HDD?

I'm on the verge of buying myself a new bus-powered USB 3.0 2.5-inch external hard drive. However, my computer only has USB 2.0 ports on it. I understand that the USB 3.0 HDD will simply run slower on ...
0
votes
0answers
36 views

What would cause a USB bus under current and how could it be corrected?

I have a new motherboard that is exhibiting a strange issue with the USB (2.0 only) bus. I am having some of my devices losing power and led lights start flicker when I am playing games and other ...
1
vote
3answers
843 views

How to control power to USB ports using batch

How can I toggle the power to a USB port on/off using batch or the command line? I am using Windows 8 to do this. Does anyone know what I could do? I have 4 USB ports.
1
vote
0answers
137 views

Can I Power the front-panel USB 2.0 ports with the power supply's 5V rail?

I have a high power (700ma+) USB device I wish to use on a single front-panel USB port. The USB specification in Wikipedia states: The USB 1.x and 2.0 specifications provide a 5 V supply on a single ...
0
votes
3answers
305 views

Disconnecting a USB device without unplugging it

I'm modifying my desktop computer case and I want to plug everything into the USB ports in the back of it. However, the ports are not easy to reach and sometimes I have to unplug some devices because ...
4
votes
1answer
7k views

What is the power output of a USB port?

As the title says, what's the power output of a USB port? Is it a standard value, or it may change depending on manufacturer/model, and so on? If that value is not standard, how can one determine ...
0
votes
1answer
72 views

Can as device that runs of USB be powered from a charger?

I have a Dreamgear PS3 Elite Gaming Headset that needs to be plugged into a USB port to power it, it cannot be used as just a "normal" set of headphones though it has a standard 3.5" plug as well ...
1
vote
1answer
142 views

USB: What is required to “add” bus power?

Question: How can I add power to a USB cable without using a USB hub? ... Background: I have a USB device that runs on bus power. I don't know how much bus power it requires (I googled). When I ...
2
votes
1answer
440 views

I can't charge my iPhone using my Apple Wired Keyboard on Windows

On OS X, I can charge my iPhone without any problems, but Windows always complains about not having enough power, regardless of what USB device I connect to the keyboard. Why is that? How can I enable ...
0
votes
2answers
257 views

How to power 2.5" USB harddisk from ASUS WL500gP v2 router

I would like to connect my 2.5" Seagate HDD to ASUS WL500gP v2 router and use it for file sharing. The HDD or it's enclosure doesn't have external power cord, it has only one (single) USB cable to ...
57
votes
7answers
7k views

Does a computer use more electricity when charging USB devices?

Something I've always wondered. If I constantly hook up cellphones, hard drives and the like via USB to my computer, will it eat up more on the electricity bill? Or are the USB ports using up ...
1
vote
2answers
257 views

Power a USB HUB via USB Male to Male cable by borrowing power from other USB port?

Is it possible to power a USB Hub by plugging into one of the ports in the hub a USB Male to male cable, and the end plugged in another USB port of PC? Will the hub draw power this way?
5
votes
2answers
5k views

How to turn on computer via USB Keyboard [closed]

I have an interesting query, my cat can turn on my computer by walking/laying on my keyboard when it is powered off, but I cannot find a way to do this intentionally. I have tried to google it, but I ...
0
votes
2answers
158 views

USB hard drive with 2 connectors; can I plug one into the wall for power?

I've got a USB 2.0 hard drive enclosure which came with a cable with 2 plugs on it. I know that this is done so that it can draw more power if necessary. If the hard drive can't draw enough power ...
0
votes
2answers
102 views

USB devices prevent computer to turn on

I have a dell optiplex 960. If I plug in 3 usb devices (keyboard, mouse, printer) all to 3 usb ports next to each other (there is a row of 4 and a row of 3 on the back of the computer), It will not ...
0
votes
0answers
47 views

Monitor power consumption of a USB port [duplicate]

I have a device attached to a Usb port and want to run some tests to see the power required for the device to function correctly. I wanted to know if there is any software which will tell me how much ...
1
vote
1answer
93 views

Signal loss with video capture device and 5 m USB cable

I have a UBS-video capture device connected to a computer with a 5 m USB-cable and a powered USB-hub at the end where the device is plugged in. The problem is I get a lot of glitches and freeze even ...
1
vote
0answers
203 views

1.8 VDC POWER remains on USB after SHUTDOWN (HP Compaq Pro 4300 SFF - Product ID: QZ219AV)

I am having unexpected opportunities with a USB Device failing to properly initialize on startup after a shutdown, which seems to be caused by residual power remaining on my USB Ports (after ...
0
votes
0answers
196 views

USB 3.0 hub; what can it power?

I own an Asus UX31A laptop, equipped with 2 USB 3.0 ports. I would like to connect several USB devices to one of these ports, using a USB 3.0 hub. 1) Am I correct in assuming the Asus "USB Charger+" ...
3
votes
1answer
834 views

How does my active DisplayPort to DVI adapter work without power?

I have three screens connected to a Radeon 6850 card. Two are connected via DVI and the third is plugged into the DisplayPort using an active DisplayPort to DVI adapter. The adapter has a USB cable ...
0
votes
3answers
152 views

I think my computer is eating my USB devices

Hi so I think the USB ports on the front of my desktop PC are eating all the devices that are plugged in. (I've found with a couple of USB disks I put at the start of the year, were then unusable on ...
1
vote
3answers
1k views

Faster USB Charging in the Home and in the Car

I've noticed that recently, USB wall chargers have gotten better, a lot better. While charging my old Nexus One used to take a long, long time, my brand new Samsung Galaxy S3 charges extremely fast, ...
0
votes
0answers
393 views

USB 3 port fails to enable my keyboard during boot

My laptop has both USB 2.0 and 3.0 ports. I've connected: mouse -- USB 2.0 port keyboard -- USB 3.0 port On starting the system, the mouse is active however the keyboard does not function. ...
3
votes
2answers
714 views

Windows 7 USB power lose after a few seconds / minutes

My friend's computer has a problem where the USB ports causes problems with the power of some devices connected to the computer. The USB mouse has no problems, however the Wireless Adapter looses ...
2
votes
2answers
1k views

Set specific USB port to turn on and off on schedule

I am trying to have a USB powered device (lets just say a USB lamp, for example) be automatically turned on at a certain time of day, and then automatically turned off at a time later in the day. I ...
1
vote
1answer
192 views

High-Powered USB hub with no AC adapter driven by 2 USB inputs [closed]

Is there any USB hub that is powered like some of the USB hard drives (connected to 2 ports at the same time). I want to avoid using AC adapter and use two USB ports to power a hub. Does anybody know ...
1
vote
2answers
2k views

Low power warning using USB ports on an external keyboard on MacBook Pro

I have a Logitech keyboard which has two USB ports. I am using the keyboard with a MacBook Pro 15" (late 2011). When I try to use the USB ports on the keyboard (say I plug in my iPhone), I get this ...
5
votes
6answers
11k views

Can I safely connect the power-only-end of a USB-Y cable to an other power source?

If the host computer for an USB device doesn't provide enough power for a device which has no dedicated power port, can I connect the power-only-plug of a Y-USB-cable to an other computer, an ...
2
votes
1answer
277 views

Is there an instrument or software that can measure the ACTUAL maximum power available to a USB port?

I use a non-self-powered USB modem device for a solutions I provide to multiple customers, and very often I encounter a problem in which the devices stops working due to many reasons, one of which I ...
0
votes
0answers
118 views

Reseting Macbook Pro keyboard and trackpad's power usage on Windows?

I recently installed a utitlity for Windows (ASUS Ai Charger) which modifies the USB ports on the computer to output more power (for charging iPads, etc). The problem is, I believe it is also giving ...
5
votes
4answers
8k views

Is there an usb power consumption meter?

For example, how could I measure the normal power consumption of my USB keyboard? After I got my statistics, I may easily notice when a hardware keylogger gets installed, by the changed power ...
1
vote
1answer
2k views

How can I switch off power to a USB port (without disabling the port)?

There are some circumstances where I would like to switch off power to a USB port, but still allow the port to function as normal. Is it possible to switch off power to a USB port using software ...
3
votes
2answers
1k views

Does it use less power to connect to a tethered phone using USB or wifi or bluetooth?

If you are tethering to the internet through your mobile and your notebook is low on power you may want that connection to use the least possible power for your notebook. A USB connection will charge ...
0
votes
1answer
647 views

Front panel (USB, headphone jack) standalone/replacement?

I have a problem with the front panel inputs on my Antec Twelve Hundred case that started a couple of weeks ago. The computer will intermittently restart when a device (USB flash drive, USB hard ...
1
vote
1answer
374 views

My USB devices sometimes flicker on boot

I have a problem with a PC where the power sometimes acts up on boot. This PC has a mouse with back-lighting. The back-lighting on the mouse will 'sometimes' flicker and the PC will not accept any ...
21
votes
2answers
31k views

Is there a USB wall charger that “just works” with every device?

Background Almost every gadget today is charged over USB. It seems like a good idea since everyone has a computer with USB, but fumbling behind a computer and making sure that computer is on and does ...
0
votes
2answers
583 views

5V external input on motherboard usb ok?

Embedded PC with many USB devices seem to have been exposed to overload or short-circuit. (some ports only deliver ~1V) Q: Would it crash the MB if regulated 5V is led from external PSU to the ...
7
votes
2answers
8k views

Is there a way to power down a USB device using software?

Is there a way that I can power off a (specific) USB device completely using software from a Linux machine? I want to use this to power off (so that the LED is off) a (single) USB stick. Do you know ...
0
votes
2answers
3k views

How do I disconnect the power from a USB host port from the shell?

How can I from the shell remove and apply USB power to one of the host USB ports in my machine?
2
votes
1answer
2k views

How can I get or make a USB to SATA-power cable?

I have a 2.5 inch SATA SSD that I want to power from an internal USB port. The SSD requires 5 volts, so I see this as being possible. I already have the data connection for the SSD, I just need to ...
2
votes
2answers
837 views

USB Power off on shut down or Eject

Done quite a bit of searching and found lots more questions but so far no answers. I need to shut down power to a USB hard drive when the computer shuts down. I understand why Vista and Windows 7 both ...
0
votes
2answers
1k views

Can the length of the USB cable be the cause of a non-working external hard drive?

I have this old external hard drive, 80 GB, nothing too fancy, that is powered entirely by USB. The problem is that it keeps disconnecting itself. I remember that I tested it with a short cable (15 ...
4
votes
3answers
5k views

Danger/Risk of Plugging USB Devices into Powered USB Ports

This question seems like it would have a logical answer, but I thought I’d ask to be safe. As shown in the photo below, there exist externally-powered USB hubs (A) and USB power-adapters—like the ...
8
votes
3answers
3k views

Amazon Kindle not charging in Ubuntu

I have a dual boot with Windows XP and Ubuntu 10.10. I connected my Amazon Kindle to an USB interface in XP and in Ubuntu. From XP everything works with no flaw. In Ubuntu the data exchange is ...
27
votes
5answers
5k views

The Flight I am taking has USB ports for power… how can I use it to charge my laptop? [duplicate]

Possible Duplicate: Charge a laptop via USB power (500mA)? I will fly to China in the next month which will take a mammoth 18 hour flight. The plane has USB power source on it. I know USB ...