Duplicate Keystrokes - Again, Again!

Harold L Hunt II huntharo@msu.edu
Mon Apr 7 00:12:00 GMT 2003


Sorry, I haven't got a clue how to help you.  I spent hours 
investigating the duplicate keystrokes problem many months ago.  I 
described some of what I learned in the following email:


All I could see is that for certain instances of Windows keypress 
messages we were generating two keystrokes in the X Client with the 
focus.  I followed this as low as I could with gdb and it was always a 
single keystroke as far as I could see, but it magically turned into two 
keystrokes at some level beyond where I could look.  I speculated that 
perhaps this was something in the MI layer trying to do an "autorepeat" 
for us, which we don't want it to do.  It could be the delay between the 
down message and the up message that is causing this.  But, like I said, 
I looked through almost all of the code and nowhere could I find a part 
that looped and created extra keypresses in the X Client.

I don't have enough time to look into this again... but I would be glad 
to help you if you would look into it.


Duncan Cragg wrote:
> Since there's been no response to this, I thought I'd add a little more 
> detail in the hope of
> triggerring a reaction!!!
> See after this copy-paste of my original email:
>> Hello - I've just arrived at this list, so hope I don't break protocol 
>> in any way!!
>> I have a problem which can be summarised as 'it's the same as the 
>> following past postings':
>> http://www.google.com/search?hl=en&lr=&ie=UTF-8&q=+site:www.cygwin.com+xfree86+duplicate+keystrokes 
>> The discussions there mentioned the infrequency of the problem of 
>> duplicate keystrokes for the respondents - a couple of times a day.
>> I, however, am getting this problem all the time: as in, every five 
>> commands or so, or every five edit keystrokes....!!!!
>> Am I alone?
>> Am I doing something odd?
>> This happens on both my work and home installations (work is 1G, home 
>> is 500M laptop; home has VNC running which I can see would make this 
>> worse, but work is not overloaded). Both installations are 
>> out-of-the-box, running twm. I can supply more details (.Xmodmap, 
>> .twmrc, .Xdefaults, etc.) if someone thinks it's relevant.
>> Any help appreciated!
>> Duncan Cragg
> So my work machine is NT and this problem only manifests when doing an 
> ssh to one of my home machines and running up an editor.  It's bad 
> enough that it's intolerable for editing - repeated keystrokes occurring 
> every 10 or so.
> At home it's much worse - this machine is running Windows 2000. Like I 
> said, it's a 500Mhz and running VNC - but I've tried turning off some of 
> the VNC checkboxes, without any improvement. VNC is only using a tiny 
> bit of CPUanyway. I can't see a 'disable VNC' checkbox or option 
> anywhere to completely switch it off though.  I get repeated chars even 
> on a bash prompt on the local machine - and it's about every five or so 
> keystrokes, biased towards carriage returns and big events like shifting 
> down half a page. It occurs equally on ssh's to other machines on local 
> xterms as to xterms launched from those machines.
> The thing these setups have in common is the .xinitrc, .twmrc, 
> .Xdefaults and .Xmodmap files.  Can anyone suggest one of these to start 
> adjusting? I can supply relevant sections - if anyone has a clue what's 
> relevant!!
> Thanks in advance for any help with this one!!
> OK - I'll look at building from source and fiddling with code, if 
> that'll prove I'm serious!! I'm going to have to get Exceed (shput!) if 
> I can't resolve this...  If no-one responds to this email, I'll keep the 
> list informed of how I'm getting on.  It'll be a riveting saga, I'm 
> sure...   =0) 
> Oh - if we can fix that problem where alt-Tabbing into or out of Xfree 
> splatters tabs over the in-focus window, it'll be a bonus. This has been 
> suggested as related in the above threads...
> Duncan Cragg

More information about the Cygwin-xfree mailing list