linux-kernel - Re: [Bug #14388] keyboard under X with 2.6.31

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Message-ID: <20091012234641.GF8345@core.coreip.homeip.net>
Date:	Mon, 12 Oct 2009 16:46:41 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Nix <nix@...eri.org.uk>,
	"Justin P. Mattock" <justinmattock@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Boyan <btanastasov@...oo.co.uk>, Ed Tomlinson <edt@....ca>,
	Frédéric L. W. Meunier <fredlwm@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Subject: Re: [Bug #14388] keyboard under X with 2.6.31

On Tue, Oct 13, 2009 at 12:38:41AM +0100, Alan Cox wrote:
> > So it seems likely to me that this is a kernel bug, somewhere, and the
> > TTY layer seems like a good place to look (OK, a horrible place, but a
> > *likely* place).
> 
> Somewhere around 2.6.29-30 various things went funny in the keyboard
> layer for me - notably characters "bleeding" across console switches.
> 

What do you mean by "bleeding"? Are you sure it is not autorepeat
kicking in?

> > 
> > I'm about to try reverting the suggested commit and will report back. I
> > see this failure about once a day, so I'll give it three days to go
> > wrong and then (if it doesn't) will presume it works and so inform you.
> > 
> > 
> > (Of course with this commit reverted Emacsen start dropping data from
> > their ptys, and as bad luck would have it I live in (X)Emacs, but that's
> > on a different machine! so I can have my compile buffer data *and* not
> > destroy X ;} )
> 
> X doesn't touch the pty layer. It touches vt (extensively) and the input
> layers. It's vt/kbd access is also very raw so bypasses much of that
> layer. That isn't to say tty isn't the cause but look for input layer
> changes too.

-- 
Dmitry
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