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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?

Parents

  • 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.

  • in reply to johnbeetem

    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.

    Aw, man. I'll pull out the altimeter tonight image

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