linux-kernel - Re: Keys get stuck

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Message-ID: <20080313171425.GA4840@ucw.cz>
Date:	Thu, 13 Mar 2008 18:14:26 +0100
From:	Pavel Machek <pavel@....cz>
To:	David Newall <davidn@...idnewall.com>
Cc:	Jiri Kosina <jkosina@...e.cz>, "Fred ." <eldmannen@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Keys get stuck

On Wed 2008-03-12 21:14:56, David Newall wrote:
> Jiri Kosina wrote:
> > Very probably this is due to broken way how X themselves implement 
> > auto-repeat, instead of using kernel-provided auto-repeat functionality.
> 
> It should be said that X implements auto-repeat out of necessity.  While
> the kernel can report key down and up events, its further interpretation
> of those events is not appropriate.  Many combinations of events are
> possible, such as keyboard plus mouse, and this precludes the kernel
> from providing a full interpretation.  It would be wrong for it to even
> try.  X is the proper place to implement auto-repeat for X.

No.

hw is proper place to implement autorepeat, and along with some
buffering, it has chance to work. Kernel is not real-time, and X are
definitely not real-time, while autorepeat is real-time operation.

It actually mostly works in ps/2 case. Buffer in hardware means that
pretty big interrupt delays can be tolerated without problems.

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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