They should be 5v mA each max, any more than this they must be used with a powered USB hub.
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Try unplugging every USB device except the keyboard you should also note that some keyboards have built in hubs and can try to draw mA Pi can only handle mA per USB slot without a hub. Also, use the latest software.
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Forum user MrEngman reported some keyboard repeats and wireless hangs until upgrading to the debian kernel, which he reports stable with no problems even with a low TP1-TP2 voltage of 4. One suggested remedy to this, which has some positive feedback, is to adjust the USB bus speed. To do this, you need to edit the cmdline. Worst case scenario, some advanced keyboards, such as the Roccat Arvo, have kernel modules that need activating. If you have access to another keyboard temporarily, you will need to modprobe the relevent driver. Or if this is not possible, you can rebuild the kernel instructions available on the wiki page with the modules installed.
On April 30 , there was a bugfix  relating to USB sharing between high-speed eg. On , user spennig was pleased to confirm that wifi was working with a USB keyboard and mouse, as long as the Raspberry Pi had a good PSU and a powered hub. Even so, some experimentation was needed, e. USB WiFi connected to the device, and the keyboard and mouse connected to the powered hub.
Some experimentation may be necessary to find a working combination; however a good power supply is essential. My experience regarding this issue point to interferences in the 2. Changing the channel on the wireless access point fixed the problem completely. Suivez les instructions. There has been more than one report    of a R-Pi booting but not getting USB input, using a known-good power supply, SD card, and keyboard. Or return the board for a replacement, but before making this conclusion, confirm known good peripherals.
As of June 1 , Eben reported  that only about 1 in shipped R-Pi boards have been found to have a hardware fault of any kind. Use the excellent guvcview program to test your webcam and to change the capture settings. You can improve the frame rate to a great extent by changing the settings. The GPU firmware and kernel can be updated with Hexxeh's rpi-update tool. However this requires the Pi to be successfully booted. With sdcard problems, you may not get that far, so can try a manual udpate.
If you have a Linux machine, rpi-update can be run on that in an offline mode, and will update your sdcard from the Linux machine.
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You can download the latest GPU firmware version here. Click on view raw , then save it, and put the new start. Similarly, the latest kernel is here. After updating these files you should be able to boot. As this noting system was causing trouble if the amount of RAM was not always the same. Make sure your editor doesn't change the first letter of the line into an uppercase letter, as some editors do. The entry is case sensitive. Luckily, if you have this problem, most built-in card readers are easy to pull apart and repair; some users have even reported succesfully unjamming the switch with a blast of compressed air from a can into the SD-card slot without having to dismantle anything.
You may also be able to temporarily get round the problem by putting the write-protect tab in a half-way position - this pushes on a different part of the strip and may break the contact - it's worth trying a few, slightly different positions. This is often caused by inadequate power. More often than not, however, the reverse is true with cheap hubs—the Pi draws just enough power backwards from the powered hub to unsuccessfully attempt booting.
There is an ongoing issue with the Ethernet connection being lost when low-speed devices, such as mice or keyboards are connected via a powered USB hub. The simplest way to solve this is to connect your mouse and keyboard directly into the 2 USB ports on the R-Pi assuming they draw less than mA apiece. The LED in the corner of the board labelled "10M" is mislabeled on the rev 1.
It is correctly labeled "" on the rev 2. You can confirm the true transfer rate using a network benchmark such as iperf. You can also read the current network speed with:. This is normal. This is too hot to touch for more than a few seconds, but it is not unusually hot for the chip. The LAN data sheet in Table 4. It uses mW at 3. Estudio de sus temperaturas en funcionamiento Is the Raspberry Pi computer getting hot? A study of its operational temperature. The Spanish article has numerous color temperature images of RasPi in various operational modes, with the highest LAN case temperature measured as The USB driver allocates memory from the kernel, and when traffic is very high e.
Crashes with high network load can also be related to your power supply, try a powered usb hub. You should have a line like:.
Try increasing that number to If the above fixes do not work, you can prevent the crashes by limiting the bandwidth This is also working sometimes if the crashes are related to power supply. Veuillez faire attention en saisissant cette commande, les espaces sont importants. Firstly, it seems that some HD TVs mute audible sound output when there is no digital input, and slowly fade the sound up and down at the start and end of digital input. This means that short duration sounds will not be heard.
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A work around is to play longer duration wav files. Secondly, it seems that some HD TVs mute audible sound output when there is only one channel of digital input. ALSA aplay uses the file information header to configure its digital output. And the aplay -c 2 option does not over-ride the settings aplay picks up from the file information header. So, if your HD TV doesn't accept just one channel of digital input, you cannot use aplay to hear a mono wav file.
However, with the command speaker-test, the -c2 option does work, and sets 2 channels in the digital stream. For example. But note that the command speaker-test seems only to like mono wav files, and seems not to play stereo wav files. The command aplay plays 2 channel stereo wav files in stereo sound without problem provided they last longer than the time it takes the TV to unmute and remute. Enter the command 'alsamixer' and use the control to check that the volume is up arrow keys and that the output is not muted M key. To install support for sound, type the following from a command line from the command prompt before "startx" or in a terminal window.
Next try:. By default output will be automatic hdmi if hdmi supports audio, otherwise analogue.
You can force it with:. Also note that you may have to add your user to the 'audio' group to get permission to access the sound card. Between December and February the standard raspbian wheezy distribution, and apt-get upgrade, included pulseaudio. Forum posts suggest that pulseaudio can break alsa. Whilst some members identify various workarounds, others find only removal of pulseaudio restores sound output. By default there are only a few hundred MB free in the 2 GB main partition, which can quickly fill up if you download files.
Also, installing some software may incorrectly create or modify a. Xauthority file in your home directory, causing startx to fail, according to this thread. Temporarily renaming, moving, or deleting that file may fix the problem. Notwithstanding the previous paragraph, omxplayer may be included in some versions of raspbian. It is a command line tool, and happily plays. Known issue with distro package as of 17th April - there's some missing boot config information.
Creating a suitable cmdline. Out of the box, R-Pi graphics don't necessarily fill the whole screen. What is your global warranty on your products? Unfortunately, we do not offer global warranty on our products. Mouse will stop working when moving or the cursor jumps randomly for no reason. Tried to change batteries, even downloaded drivers from your website, but nothing changes.
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What can I do? Please try to change a new battery first if needed. Sometimes the wireless mouse cursor jump randomly, it's possible the AP router AP router and receiver use the same frequency or a battery low problem will cause the receiver frequency to be affected.
Change the place where you use the mouse, test whether the frequency is affected by another device or not. If yes, move the AP router farther away from receiver, and also move the mouse closer to receiver. But if it is not a wireless mouse, the mouse is broken. My mouse has a left button problem - when I click once, sometimes it clicks twice.
Tried to put in a new battery, change the USB port on my laptop, but the issue is still the same.