Subject: Re: Still problems with DS5000/25 (was abnormal mouse behavior)
To: Reinhold Huber <Reinhold_Huber@Physik.TU-Muenchen.DE>
From: Michael L. Hitch <firstname.lastname@example.org>
Date: 12/13/1998 20:40:58
[Getting caught up with old email, and can't remember if I responded to
On Tue, 3 Nov 1998, Reinhold Huber wrote:
> Since then I encountered another problem: At least when I interrupt some
> process which consumes some system load, e.g. a make installing emacs,
> the ctrl-key inverts its function: I have to press C-c instead of c, c
> instead of C-c and so on.
> Is it possible that this change has caused this? What info should I supply
> to help finding out what's up?
I think I've seen this once in a while, but haven't tracked it down. I'd
guess that the key-up transition of the control key got lost. The dtop.c
interrupt handler still misses data once in a while [there's a printf()
that's enabled with DEBUG or DIAGNOSTIC that should print a message when
the bus gets an 'overrun']. I thought that the way the LK501 keyboard
data is passed should prevent that, but I don't remember the details at
the moment. [I seem to recall that each packet of data from the keyboard
is supposed to indicate which keys are currently down.] I also don't
recall the details of how that data is processed and passed to the X
event queue, which could also lose the control key up transition.