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From: Aaron Lu <aaron.lu@intel.com>
To: Pavel Machek <pavel@suse.cz>,
	Konstantin Karasyov <konstantin.a.karasyov@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Zhang Rui <rui.zhang@intel.com>,
	Lan Tianyu <tianyu.lan@intel.com>,
	ACPI Devel Mailing List <linux-acpi@vger.kernel.org>
Subject: Why we put FAN to full speed in its suspend callback
Date: Wed, 22 Jan 2014 17:04:54 +0800	[thread overview]
Message-ID: <52DF89B6.1080400@intel.com> (raw)

Hi,

I was trying to minimize system suspend time and it turned out there are
firmwares that would do crazy things like delaying 10ms in FAN's power on
control method. So I wonder why do we want to put the FAN into ACPI D0
state when we are going to enter a sleep state? The code seems to be
written according to Pavel's comment here:
https://bugzilla.kernel.org/show_bug.cgi?id=5000#c6
It would be great to understand why and remove that operation if
possible, thanks for reading and taking your time bringing back your
ancient memory :-)

             reply	other threads:[~2014-01-22  9:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-22  9:04 Aaron Lu [this message]
2014-01-22 21:11 ` Why we put FAN to full speed in its suspend callback Rafael J. Wysocki
2014-01-23  1:08   ` Aaron Lu

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