linux-kernel - Re: [git pull] Input updates for 2.6.34-rc6

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Message-ID: <alpine.LFD.2.00.1005130908350.3711@i5.linux-foundation.org>
Date:	Thu, 13 May 2010 09:16:31 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
cc:	Bastien Nocera <hadess@...ess.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: [git pull] Input updates for 2.6.34-rc6

On Thu, 13 May 2010, Dmitry Torokhov wrote:
> 
> From what I remember (it was a few weeks old thread) we were hanging
> when trying to read from the controller in i8042_flush(). Normally, if
> controller isn't there we'd get a stream of 0xff which will never
> "clear" and so after 32 reads we give up and abort controller
> initialization. But on Bastien's box it just sits there.

Is there a web interface to some archive for linux-input (or was this 
thread on lkml)?

Anyway, the fact that apparently pressing the power button makes it come 
alive again implies that it's likely SCI/SMI-related. Which is not 
entirely unexpected if there is some crazy SMM thing going on. But 
presumably whatever buggy Apple code is _supposed_ to work for Windows, so 
I wonder what bug that quite simple status/data register read could 
possibly trigger.

Is it the status read or the data read that causes problems, and is it the 
first one or after doing a few? A couple of printk's in that i8042_flush() 
routine should tell us.

			Linus
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