From: Vojtech Pavlik <vojtech@suse.cz>
To: Andries Brouwer <aebr@win.tue.nl>
Cc: Neil Brown <neilb@cse.unsw.edu.au>,
Vojtech Pavlik <vojtech@suse.cz>,
linux-kernel@vger.kernel.org
Subject: Re: Input issues - key down with no key up
Date: Fri, 15 Aug 2003 12:58:02 +0200 [thread overview]
Message-ID: <20030815105802.GA14836@ucw.cz> (raw)
In-Reply-To: <20030815094604.B2784@pclin040.win.tue.nl>
On Fri, Aug 15, 2003 at 09:46:04AM +0200, Andries Brouwer wrote:
> > I have a notebook (Dell Latitude D800) which has some keys (actual
> > fn+something combinations) that generate Down events but no Up events
> > (clever, isn't it).
> >
> > This makes those keys unusable with 2.6.0 as it is because the input
> > layer insists on there being up events. Once it sees a down, it will
> > ignore any future down events until it sees an up event. It will
> > also auto-repeat the key until some other key is pressed. On the
> > whole, not very useful for these keys.
> >
> > After some thought, the simplest way I could think of to fix it was
> > to have a bitmap of keys that don't generate up events themselves.
>
> I think we should go for a much simpler fix: only enable the timer-induced
> repeat when the user asks for that (say, by boot parameter).
> The keyboard already knows which keys repeat and which don't.
That won't solve it - the key, while not repeating would be still
considered 'down' by the kernel and any more pressing of the key
wouldn't do anything.
> If we forget about the kernel-invented repetition, we solve, I suppose,
> the problems of those people who see impossibly fast repeat, and
> also your problem.
Only for those with PS/2 keyboards. We still need the kernel repeat for
all other kinds of keyboards. And the impossibly fast repeat problem
actually needs solving elsewhere - it's a bad interaction betwen ACPI
and kernel timer, and that'll cause more trouble than just fast repeat.
> Your solution, which involves an ioctl, would force changes to user space.
> Too inconvenient.
My proposed solution is to do an input_report_key(pressed) immediately
followed by input_report_key(released) for these keys straight in
atkbd.c. Possibly based on some flag in the scancode->keycode table for
that scancode.
> [By the way, I am a collector of data on strange keyboards - could you
> on a 2.4 system use showkey -s and tell me about the combinations
> without Up events? - aeb@cwi.nl]
--
Vojtech Pavlik
SuSE Labs, SuSE CR
next prev parent reply other threads:[~2003-08-15 10:58 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-15 5:16 Input issues - key down with no key up Neil Brown
2003-08-15 7:46 ` Andries Brouwer
2003-08-15 10:58 ` Vojtech Pavlik [this message]
2003-08-15 12:36 ` Andries Brouwer
2003-08-15 12:43 ` Vojtech Pavlik
2003-08-15 13:27 ` Jamie Lokier
2003-08-15 13:52 ` Vojtech Pavlik
2003-08-15 14:02 ` Jamie Lokier
2003-08-15 15:05 ` Jason Lunz
2003-08-15 13:04 ` Jamie Lokier
2003-08-15 13:10 ` Vojtech Pavlik
2003-08-15 13:33 ` Jamie Lokier
2003-08-15 13:53 ` Vojtech Pavlik
2003-08-16 13:02 ` Maciej W. Rozycki
2003-08-16 14:09 ` Jamie Lokier
2003-08-17 21:54 ` Vojtech Pavlik
2003-08-18 12:22 ` Maciej W. Rozycki
2003-08-18 10:29 ` Andries Brouwer
2003-08-19 13:04 ` Maciej W. Rozycki
2003-08-19 17:48 ` Andries Brouwer
2003-08-21 11:37 ` Maciej W. Rozycki
2003-08-21 12:44 ` Andries Brouwer
2003-08-21 13:45 ` Maciej W. Rozycki
2003-08-21 14:28 ` Andries Brouwer
2003-08-21 14:38 ` Maciej W. Rozycki
2003-08-21 13:48 ` Jamie Lokier
2003-08-21 14:08 ` Maciej W. Rozycki
2003-08-21 14:14 ` Vojtech Pavlik
2003-08-21 14:33 ` Maciej W. Rozycki
2003-08-21 14:44 ` Andries Brouwer
2003-08-21 15:03 ` Maciej W. Rozycki
2003-08-21 15:29 ` Vojtech Pavlik
2003-08-16 13:01 ` Maciej W. Rozycki
2003-08-15 12:46 ` Neil Brown
2003-08-15 12:54 ` Vojtech Pavlik
2003-08-15 13:52 ` Andries Brouwer
2003-08-15 14:13 ` Vojtech Pavlik
2003-08-16 7:57 ` Neil Brown
2003-08-18 16:01 ` Vojtech Pavlik
2003-08-19 11:40 ` Neil Brown
2003-08-19 11:50 ` Vojtech Pavlik
2003-08-19 23:59 ` Neil Brown
2003-08-20 22:36 ` Andries Brouwer
2003-08-20 22:58 ` Jamie Lokier
2003-08-20 23:52 ` Andries Brouwer
2003-08-21 0:03 ` Jamie Lokier
2003-08-21 0:33 ` Andries Brouwer
2003-08-21 1:36 ` Jamie Lokier
2003-08-21 8:08 ` Vojtech Pavlik
2003-08-21 8:06 ` Vojtech Pavlik
2003-08-21 11:40 ` Maciej W. Rozycki
2003-08-21 12:48 ` Andries Brouwer
2003-08-21 13:22 ` Jamie Lokier
2003-08-21 13:29 ` Maciej W. Rozycki
2003-08-21 8:01 ` Vojtech Pavlik
2003-08-22 0:27 ` Andries Brouwer
2003-08-22 7:33 ` Vojtech Pavlik
2003-08-25 4:22 ` Jamie Lokier
2003-08-25 8:22 ` Vojtech Pavlik
2003-08-25 19:36 ` Jamie Lokier
2003-09-03 8:06 ` Pavel Machek
2003-08-22 13:35 ` Maciej W. Rozycki
2003-08-16 15:15 John Bradford
2003-08-18 11:53 ` Maciej W. Rozycki
2003-08-19 19:37 John Bradford
2003-08-19 23:58 ` Jamie Lokier
2003-08-20 5:59 John Bradford
2003-08-20 15:17 ` Jamie Lokier
2003-08-21 12:11 John Bradford
2003-08-21 12:26 ` Vojtech Pavlik
2003-08-23 12:30 Norman Diamond
2003-08-25 4:24 ` Jamie Lokier
2003-08-25 12:15 ` Norman Diamond
2003-08-25 8:45 John Bradford
2003-08-25 12:47 John Bradford
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