linux-kernel - Re: [PATCH] Request driver inclusion

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Message-ID: <20090618135457.GA927@rhlx01.hs-esslingen.de>
Date:	Thu, 18 Jun 2009 15:54:57 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Peter Feuerer <pfe@...e.net>
Cc:	Borislav Petkov <petkovbb@...glemail.com>,
	Andreas Mohr <andi@...as.de>, Ed Tomlinson <edt@....ca>,
	akpm@...ux-foundation.org, Len Brown <len.brown@...el.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Request driver inclusion - acer aspire one fan control

Hi,

On Thu, Jun 18, 2009 at 03:31:35PM +0200, Peter Feuerer wrote:
> You are partly right, setting the fan to auto in  
> "acerhdf_revert_to_bios_mode" can be removed, as this is done by the 
> thermal layer when calling "acerhdf_set_cur_state" with 
> disable_kernelmode=1.

No, it was done _specifically_ this way to make sure that _exactly when_
switching away from kernel mode FAN_AUTO _always_ (by asking people to
always call this central function) gets set, too.
I don't want to depend on a separate, _uncontrollable_ entity
(thermal layer function) to have to run sometime later
in order to set the fan to FAN_AUTO (IOW, BIOS-controlled mode) accordingly.
_Of course_ this FAN_AUTO call is redundant in _most_ cases, but very
intentionally so. Anything else would be woefully unsafe (with a fan
remaining in FAN_OFF position until machine meltdown).

Andreas Mohr
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