[CentOS] Intermittently unresponsive mouse

Wed Nov 8 00:22:44 UTC 2017
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Tue, November 7, 2017 6:10 pm, John R Pierce wrote:
> On 11/7/2017 3:47 PM, H wrote:
>> I think you were right. I moved the computer a little bit closer and no
>> longer have the problem. It is a Bluetooth mouse, I did not know that
>> they were that sensitive to the distance...
> Bluetooth in absence of other 2.4Ghz  interference (cough, wifi) can
> work reasonably well at like 20-30 feet.    if there's active nearby
> wifi on 2.4Ghz, forget it, much closer.

If there is any other sort of 2.4 GHz device, then it will be even worse.
Such devices that poison this unlicensed band can be:

1. microwave oven
2. 2.4 GHz "cordless" phone (the one that is using ground line, and had
cordless hand unit talking with base station on 2.4 GHz band)
3. other 2.4 GHz devices (like music center with wireless links) may be
less nasty than the above two, they pretty much will be close to WiFi
network units

You also may have neighbor behind the wall with the stuff like above, or
even worse: your place maybe in the path of the beam between two places
using 2.4 GHz connection channel (the last is less likely, as they usually
like not to have any obstructions along the beam, but you may still be hit
by the periphery of their beam).

Incidentally, there are higher power bluetooth USB adapters that are
capable to provide about 50 feet range coverage...


> --
> john r pierce, recycling bits in santa cruz
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247