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

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Date:	Mon, 12 Oct 2009 17:14:56 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Nix <nix@...eri.org.uk>,
	"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

Dmitry Torokhov wrote:
> 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.
>>      
>
>    
FWIW:
Something I noticed with fedora/ubuntu(latest) is while opening
a terminal the history(example: pressing up arrow) will just
start firing off as if I pressed the arrow up key and held it,
all the way until the end of the history file( .bash_history).
seems to do this at a random, if I'm compiling most notable during 
./configure.
(When this happens the screen will be garbled with characters similar to 
this:
^C)

During my clfs build I used fedora as the host system, and this behavior 
went
right into the newly created system. When I built another system, I used 
ubuntu
and it seems to not be as bad, but still present.(I'm thinking , if this 
is what
others are experiencing it must be something in  userspace)

Justin P. Mattock
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