[Development] Qt/XCB applications and deadkeys (which cease working) (and sometimes the entire keyboard in Konsole)
René J. V. Bertin
rjvbertin at gmail.com
Thu Jun 8 15:23:48 CEST 2017
Thiago Macieira wrote:
> Just to provide a different viewpoint: I've only ever used "English (Alt
> International)" for the last, oh, 20 years, and I haven't had deadkey problems
> in the last 3.
I've been using the "English (Macintosh)" layout for a bit over 3 years now,
without any issue until I upgraded my hardware a year ago. I don't see how that
would be related, but as far as I can tell this still doesn't happen on the old
> What you're describing isn't exactly a Qt problem, but must be caused by some
> other application.
Do you have an idea why only Qt applications would be affected?
> The deadkeys lose their state if certain (keyboard) events
> get sent to the application between the deadkey and the modified key.
I've suspected KDE's kglobalacceld but restarting that one doesn't make any
The only other global interference I can think of would come from the
screensaver, possibly through the X server itself. I *think* the deadkey issue
only happens after the screensaver has kicked in but am not 100% certain.
Anyway, changing the screensaving engine from the one in KWin to xscreensaver
> If some
> other application is playing tricks with your keyboard, it will affect the
I guess it'll be very nontrivial figuring out who might be responsible?
FWIW, I have another keyboard issue which I realise could somehow be related
because it too never occurred on my old notebook. It affects Konsole only, both
the Qt4 and Qt5 versions. In this case I lose keyboard input completely (the
paste menu action continues to work). That's either in a single tab or
application wide; in the former case I can usually just clone the tab and keep
working, in the latter case I have to restart the entire application.
And this issue can strike at any moment; I've never been able to reproduce it at
will or even figure out a pattern in what I was doing when it triggered.
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