linux-kernel - Re: [PATCH] blink: Only blink when parameter is set

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Message-Id: <200706202256.53850.dtor@insightbb.com>
Date:	Wed, 20 Jun 2007 22:56:52 -0400
From:	Dmitry Torokhov <dtor@...ightbb.com>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] blink: Only blink when parameter is set

On Wednesday 20 June 2007 20:24, Jiri Kosina wrote:
> On Thu, 21 Jun 2007, Pavel Machek wrote:
> 
> > > this has probably been already solved by proper throttling - see 
> > > http://lkml.org/lkml/2007/6/15/22
> > No, it was not. I still saw the problems with CONFIG_BLINK on, that is
> > one blink per 5 seconds or something.

Pavel, does my patch fixes keyboard issues for you when blinking via
setleds?

> > We should rename CONFIG_BLINK to
> > CONFIG_BREAK_THINKPAD_KEYBOARD_AND_MORE.

Also CONFIG_KILL_MY_NOHZ_SAVINGS ;)

> 
> In fact it looks quite weird that one blink per 5 seconds can break the 
> keyboard, in fact.

Not wierd at all. The driver uses panic_blink - something that we expect
to work after panic. It rapidly polls KBC status register to detect when
it accepted led command and does it without taking i8042_lock (because
it may have been taken before kernel panicked) so it is quite possible
that that interferes with atkbd operation.

IOW I am not really interested in reports regrading issues with keyboards
and/or mice on boxes with blink driver loaded.

-- 
Dmitry
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