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Re: [Qemu-trivial] [Qemu-devel] patch: add delay=<msecs> suboption to -d

From: Gerd Hoffmann
Subject: Re: [Qemu-trivial] [Qemu-devel] patch: add delay=<msecs> suboption to -display curses
Date: Mon, 26 May 2014 15:38:40 +0200

On Sa, 2014-05-24 at 21:21 -0400, Dave Mielke wrote:
> [quoted lines by Peter Maydell on 2014/05/25 at 01:04 +0100]
> >Why is this a problem only for the curses UI frontend, and not for
> >any of the other UIs which might send key events?
> One reason is that most UIs send key events as they receive them from the 
> keyboard, one at a time, whereas the curses UI gets a single key event from 
> curses and then sends all of the scancodes which it takes to represent that 
> key. In other words, a single key event from curses could result in as many 
> as 
> 10 actual key events needing to be passed along - both the press and release 
> for the actual key plus up to four modifiers (shift, control, alt, altgr).

Tried to make the curses ui a bit more clever?  You could try caching
the modifier state, then send only the changes.  That gets the number of
events down to 6 max (4 to update modifier state, 2 for the actual key).

Other question: has "git revert
2858ab09e6f708e381fc1a1cc87e747a690c4884" any effect?


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