From: Takashi Iwai <tiwai@suse.de>
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>
Subject: Re: [patch] pm: fix runtime powermanagement's /sys interface
Date: Fri, 13 Jan 2006 21:00:46 +0100 [thread overview]
Message-ID: <s5hd5ivnbip.wl%tiwai@suse.de> (raw)
In-Reply-To: <20060106042422.GB2496@ucw.cz>
[-- Attachment #1: Type: text/plain, Size: 703 bytes --]
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
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next prev parent reply other threads:[~2006-01-13 20:00 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-27 21:34 [patch] pm: fix runtime powermanagement's /sys interface Pavel Machek
2005-12-27 21:55 ` Dmitry Torokhov
2005-12-27 22:05 ` Pavel Machek
2005-12-28 4:22 ` Patrick Mochel
2006-01-04 21:34 ` [linux-pm] " Pavel Machek
2006-01-04 22:06 ` Alan Stern
2006-01-04 22:16 ` [linux-pm] " Pavel Machek
2006-01-05 21:43 ` Patrick Mochel
2006-01-05 22:06 ` [linux-pm] " Alan Stern
2006-01-05 22:28 ` Pavel Machek
2006-01-05 21:42 ` [linux-pm] " Patrick Mochel
2006-01-05 21:55 ` Pavel Machek
2006-01-05 22:13 ` [linux-pm] " Dominik Brodowski
2006-01-05 22:23 ` Pavel Machek
2006-01-05 22:27 ` Dominik Brodowski
2006-01-05 22:59 ` Pavel Machek
2006-01-05 23:08 ` Pavel Machek
2006-01-05 23:46 ` [linux-pm] " Dominik Brodowski
2006-01-05 23:58 ` Pavel Machek
2006-01-06 0:04 ` Patrick Mochel
2006-01-06 0:12 ` Pavel Machek
2006-01-06 1:37 ` Patrick Mochel
2006-01-06 8:59 ` Pavel Machek
2006-01-07 5:47 ` Adam Belay
2006-01-06 9:00 ` Pavel Machek
2006-01-06 15:00 ` Dominik Brodowski
2006-01-07 5:58 ` Adam Belay
2006-01-06 15:42 ` Alan Stern
2006-01-07 0:08 ` Pavel Machek
2006-01-07 3:19 ` Alan Stern
2006-01-07 7:58 ` Adam Belay
2006-01-07 10:20 ` Pavel Machek
2006-01-07 13:06 ` Adam Belay
2006-01-06 4:17 ` Pavel Machek
2006-01-07 7:41 ` [linux-pm] " Adam Belay
2006-01-07 15:24 ` Alan Stern
2006-01-06 1:10 ` Dominik Brodowski
2006-01-06 8:53 ` Pavel Machek
2006-01-06 0:38 ` Greg KH
2006-01-06 15:03 ` Dominik Brodowski
2006-01-06 16:25 ` Kay Sievers
2006-01-09 20:10 ` [linux-pm] " Dominik Brodowski
2006-01-05 22:15 ` Patrick Mochel
2006-01-05 22:44 ` Pavel Machek
2006-01-05 23:54 ` Patrick Mochel
2006-01-06 0:07 ` [linux-pm] " Pavel Machek
2006-01-06 14:34 ` Tom Marshall
2006-01-06 16:20 ` Pavel Machek
2006-01-07 8:36 ` Adam Belay
2006-01-07 10:25 ` Pavel Machek
2006-01-07 12:45 ` Adam Belay
2006-01-06 4:24 ` Pavel Machek
2006-01-13 20:00 ` Takashi Iwai [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-01-05 15:16 Scott E. Preece
2006-01-05 22:21 Preece Scott-PREECE
2006-01-05 22:45 ` Pavel Machek
2006-01-06 0:02 ` Patrick Mochel
2006-01-05 22:55 Preece Scott-PREECE
2006-01-05 23:05 ` Pavel Machek
2006-01-06 0:31 Scott E. Preece
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