2012/11/14 Frank Peters <frank.peters@comcast.net>

Hello,

Lately I have been experiencing a strange problem. Under X my USB keyboard
will suddenly stop working. If I press some keys they will not appear in an
X console or in any other application. There is no warning. It just
will sporadically stop working. Usually, if I wait for several minutes
the keys will start working again.

Fortunately, the USB mouse will continue to function normally during these
episodes. If I then immediately shutdown X using some mouse clicks, I will
again have a working keyboard. Also, the last few keys I had pressed before
shutting down X will appear in my console. This would mean that the key
presses are detected and placed into the buffer but somehow the X applications
do not receive them.

I cannot pinpoint the start of this behavior to any specific system changes,
but I suspect that the latest nvidia-drivers may be the source of the problem.
The problem seems to coincide with one of the several nvidia updates, but
this is still a guess.

My system is updated daily and I use only the Fvwm window manager (no Gnome or K).

How can I debug this further? Both the kernel log and the X log show nothing
whatever.

Frank Peters