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Logitech MK120 Keys Respawning Too Fast

Former Member

Hi,

 

After reading on a wiki, the Logitech MK120 appeared under the "Known to work" category for raspberry pi. I promptly ordered it from amazon, as my previous keyboards did not work >_<


Now, I get the same error. I am at the boot screen, and the pi recognizes the device IS there. However, type a key or do nothing at all, and I'll get the error: "ERROR: Keys respawning too fast. Disabled for 5 minutes." or something like that.


Is there a way to fix this?

  • I have the same keyboard and have not seen this problem with it. Please execute this command in your home directory and post the initab.txt file it creates in a reply:

     

    cat /etc/inittab > inittab.txt

     

    I will check it against my version of the file and see if there are any diferences that might cause this.

  • in reply to gdstew

    Uhh... how exactly can I execute a cmd with no working keyboard? SSH?

  • in reply to Former Member

    Is that the only USB keyboard you have ? If not try whatever you have available, a different one may work.

     

    SSH is another possibility but I think it is disabled by default (I could be wrong, I don't use it)

     

    Serial console is another but of course it requires an RS232 level or USB adapter.

     

    If you have another computer running Linux you can plug the SDHC card into a card reader and access /etc/inititab that way.

  • in reply to Former Member

    Sorry I was in a bit of a hurry earlier. Here are a few more suggestions.

     

    First a question. Was the Raspberry Pi working before or is this happening on your first attempt to use it ?

     

    Make sure that the keyboard does not have any keys that are stuck in the down position.

     

    If you have a mouse plugged into one of the Raspberry Pi USB ports remove it and try the keyboard in both USB

    ports to make sure that it is not a bad USB port (or the mouse) causing the problem.

     

    If you have more than one USB keyboard try the other keyboard even if it not on the "official" list. I have tried

    a couple of older USB keyboards that I had laying around and were not on the list and they worked. Even if the

    keyboard does not work it would be useful to know if it causes the same message. If it works or does not generate

    the same message it is possible that the keyboard you bought is bad.

  • in reply to gdstew

    Are you runing the latest version of the OS ? I had problems with more than 1 keyboard at the beginning. I would

    type "pi" to login, and either the p or the i would repeat for ever.   The problem disappeared with a later version of raspbian.

  • in reply to gdstew

    Dude.

    as my previous keyboards did not work >_<

  • There might be some useful comments and pointers in this discussion: http://www.element14.com/community/message/80227, which references the RasPi Troubleshooting Wiki.

     

    A lot of strange RasPi problems are due to iffy power.  For example, some keyboards may need closer to 5.0V to work than others, or if the 5V goes too low the SoC works but the USB chip doesn't.

  • in reply to johnbeetem

    A lot of strange RasPi problems are due to iffy power.  For example, some keyboards may need closer to 5.0V to work than others, or if the 5V goes too low the SoC works but the USB chip doesn't.

    Ah.

    I think I got my Pi model B as a kit from Adafruit, not so sure as it was a gift. The pi itself was in an element14 box.

    Anyhow, it came with a USB wall plug, and on the bottom it says that the output is "5.25VDC 1A". That could be why?

     

    If so, should I buy a different charger?

  • in reply to Former Member

    lawm wrote:

     

    A lot of strange RasPi problems are due to iffy power.  For example, some keyboards may need closer to 5.0V to work than others, or if the 5V goes too low the SoC works but the USB chip doesn't.

    Ah.

    I think I got my Pi model B as a kit from Adafruit, not so sure as it was a gift. The pi itself was in an element14 box.

    Anyhow, it came with a USB wall plug, and on the bottom it says that the output is "5.25VDC 1A". That could be why?

     

    If so, should I buy a different charger?

     

    You can have power problems even if the "wall wart" is fine.  RasPi power has to go through a Micro USB cable and then through polyfuse F3 before it can be measured at TP1 and TP2.  Some micro USB cables have very thin conductors and you get a sizeable voltage drop.  (Adafruit probably has a good cable.)  Some F3 polyfuses are out of spec and cause an excessive voltage drop.  If you have a multimeter or voltmeter, it's easy to check that the voltage between TP1 and TP2 is 4.8V to 5.2V.

     

    Iffy power can cause many different symptoms so it's good to rule it out.  The RasPi Troubleshooting Wiki has a good section on power supply problems and shows how to check 5V at TP1 and TP2: http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems.