[Bug 124406] Re: Keyboard keys get stuck and repeat (Feisty, Gutsy)

[Mark Schreiber]

>Have you mapped the Ctrl key to the Caps Lock key?

Good catch.

Yes, I'm using swapcaps in xorg.

I used dumpkeys, swapped keycode 29 and 58, and ran the result through
loadkeys.

When I ran emacs in a console, I did not get duplicated keypresses but I
did get the missing key up event (based on the od -x output from the
event1 device) -- the same thing I see when emacs is running in X.  It
looks like the "non-duplication" is  because xorg is responsible for
generating repeats in X and the kernel is responsible for generating
repeats in the terminal.  So the events from event1 are still wrong and
the key is never being "released" -- it just isn't user-visible in the
form of a repeating keypress.  From a user standpoint, of course, this
may not matter, since the key doesn't appear to be down to the user.

Interestingly enough, as you've noticed, I could not reproduce the
problem when using the standard Control/Caps Lock mappings in the
console -- only when the two are swapped.  This may be because I simply
can't release the lower-left control key quickly enough, but I did spend
a while trying to get it to happen without luck.

Unless someone can produce this with the standard Control/Caps Lock
mappings, I think that, as a user-visible bug, this can be narrowed to
people who are using swapped caps in xorg.

-- 
Keyboard keys get stuck and repeat (Feisty, Gutsy)
https://bugs.launchpad.net/bugs/124406
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