From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: [patch] pm: fix runtime powermanagement's
	/sys	interface
Date: Fri, 13 Jan 2006 21:00:46 +0100
Message-ID: <s5hd5ivnbip.wl%tiwai@suse.de>
References: <20051227213439.GA1884@elf.ucw.cz>
	<d120d5000512271355r48d476canfea2c978c2f82810@mail.gmail.com>
	<20051227220533.GA1914@elf.ucw.cz>
	<Pine.LNX.4.50.0512271957410.6491-100000@monsoon.he.net>
	<20060104213405.GC1761@elf.ucw.cz>
	<20060107083602.GE3184@neo.rr.com>
	<20060107102554.GC9225@elf.ucw.cz>
	<20060107124544.GA3972@neo.rr.com> <20060106042422.GB2496@ucw.cz>
Mime-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka")
Content-Type: multipart/mixed; boundary="===============31521312309818095=="
Return-path: <linux-pm-bounces@lists.osdl.org>
In-Reply-To: <20060106042422.GB2496@ucw.cz>
List-Unsubscribe: <https://lists.osdl.org/mailman/listinfo/linux-pm>,
	<mailto:linux-pm-request@lists.osdl.org?subject=unsubscribe>
List-Archive: <http://lists.osdl.org/pipermail/linux-pm>
List-Post: <mailto:linux-pm@lists.osdl.org>
List-Help: <mailto:linux-pm-request@lists.osdl.org?subject=help>
List-Subscribe: <https://lists.osdl.org/mailman/listinfo/linux-pm>,
	<mailto:linux-pm-request@lists.osdl.org?subject=subscribe>
Sender: linux-pm-bounces@lists.osdl.org
Errors-To: linux-pm-bounces@lists.osdl.org
To: Pavel Machek <pavel@ucw.cz>
Cc: Andrew Morton <akpm@osdl.org>, Linux-pm mailing list <linux-pm@lists.osdl.org>, kernel list <linux-kernel@vger.kernel.org>
List-Id: linux-pm@vger.kernel.org

--===============31521312309818095==
Content-Type: text/plain; charset=US-ASCII

At Fri, 6 Jan 2006 04:24:22 +0000,
Pavel Machek wrote:
> 
> 
> > > > 1.) most sound cards have more than two states. (once again latency over
> > > > power savings trade offs)
> > > 
> > > What is the latency in typical "most sound card" case?
> > 
> > ACPI requires within 100ms for D1 and D2.  D3 can be longer.
> 
> Spec is useless here. 1usec is <100msec. Do you know any
> soundcard that takes >10msec from D3?

In the case of D3, the driver needs to initialize fully, and a latency
longer than 10ms may easily happen espeically with HZ=100.

Most of codec chips have powersave modes (disable converters and
amps), so having a "powersave" state makes sense, not only "on" and 
"suspend".


Takashi

--===============31521312309818095==
Content-Type: text/plain; charset="iso-8859-1"
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline


--===============31521312309818095==--