linux-kernel - Re: Keys get stuck

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Message-Id: <E1JaGOQ-0003km-7S@be1.7eggert.dyndns.org>
Date:	Fri, 14 Mar 2008 21:20:41 +0100
From:	Bodo Eggert <7eggert@....de>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Pavel Machek <pavel@....cz>,
	David Newall <davidn@...idnewall.com>,
	Jiri Kosina <jkosina@...e.cz>, "Fred ." <eldmannen@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Keys get stuck

Lennart Sorensen <lsorense@...lub.uwaterloo.ca> wrote:
> On Thu, Mar 13, 2008 at 06:14:26PM +0100, Pavel Machek wrote:

>> 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.
> 
> So does the keyboard events generate something like this then:
> 
> KEY_x_DOWN
> KEY_x_REPEAT
> KEY_x_UP
> 
> If so then X certainly could get all the keyboard information I imagine
> it needs from the kernel, but otherwise I am not sure how it could.  A
> repeated series of key down events are not enough since some keys you
> don't want repeated you just want to know when the key is held down and
> when it isn't.

You just need a timestamp for each event, and you can get a timestamp for
each event (as far as I read in this thread). Using the current time while
processing the event is plain stupid.

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