Hi Friedhelm,

thanks for the debugging. Would it be possible for you to run
"xset q | grep bell" in terminal, for both cases?

That should report somthing like:
----
  bell percent:  50    bell pitch:  400    bell duration:  100
----

where the first number is "volume" as percentage, the second the
frequency, and the third beep duration in milliseconds.

You may set those with "xset b <volume> <frequency> <duration>"
or a simple "xset b on" or "xset b off"

Perhaps the difference is in that setting, which then might be due to
a default setting difference for xorg (as a side function of the
patch).

regards,

Ralph.