From: Jiri Kosina <jkosina@suse.com>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: "Brown, Len" <len.brown@intel.com>,
"ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>,
Alan Stern <stern@rowland.harvard.edu>,
Kristen Carlson Accardi <kristen@linux.intel.com>,
Grant Likely <grant.likely@linaro.org>
Subject: Re: [Ksummit-discuss] [TECH TOPIC] System-wide interface to specify the level of PM tuning
Date: Tue, 7 Jul 2015 09:53:44 +0200 (CEST) [thread overview]
Message-ID: <alpine.LNX.2.00.1507070948590.10183@pobox.suse.cz> (raw)
In-Reply-To: <6142539.s1gh8ubrRK@vostro.rjw.lan>
On Mon, 6 Jul 2015, Rafael J. Wysocki wrote:
> For one example, the default for most of the device/.../power/control
> files in sysfs is "on" (meaning no runtime PM) while it might be "auto"
> (use runtime PM if you can). Making that change for everybody in one go
> may lead to various issues (that may be regarded as regressions then),
I don't believe that the current default settings are set the way they are
set because we intentionally want to prefer performance to power
efficiency. The real problem is that it's really the only "safe" default,
because turning power-management features on is likely to cause
unpredictable issues (being it either real bugs in code, or just bad user
experience stemming from unexpected system behavior).
Such as suspended keyboard losing first keypress during wakeup (very
common). Or wireless power management not working properly between the
client and AP. Etc etc.
--
Jiri Kosina
SUSE Labs
next prev parent reply other threads:[~2015-07-07 7:54 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-06 0:22 Rafael J. Wysocki
2015-07-06 1:21 ` Josh Triplett
2015-07-06 14:04 ` Rafael J. Wysocki
2015-07-06 1:40 ` NeilBrown
2015-07-06 14:12 ` Rafael J. Wysocki
2015-07-06 13:49 ` Iyer, Sundar
2015-07-06 14:21 ` Rafael J. Wysocki
2015-07-07 7:53 ` Jiri Kosina [this message]
2015-07-07 12:33 ` Rafael J. Wysocki
2015-07-10 17:25 ` Kevin Hilman
2015-07-12 10:01 ` Daniel Vetter
2015-07-13 23:07 ` Rafael J. Wysocki
2015-07-14 16:51 ` Daniel Vetter
2015-07-15 22:44 ` Rafael J. Wysocki
2015-07-16 1:10 ` Josh Triplett
2015-07-16 9:19 ` David Woodhouse
2015-07-16 15:44 ` Kristen Accardi
2015-07-16 15:53 ` Josh Triplett
2015-07-16 15:58 ` Greg KH
2015-07-17 10:34 ` Takashi Iwai
2015-07-17 11:41 ` Daniel Vetter
2015-07-20 22:21 ` Rafael J. Wysocki
2015-07-20 23:09 ` Daniel Vetter
2015-07-22 1:12 ` Rafael J. Wysocki
2015-07-22 7:18 ` Daniel Vetter
2015-07-22 17:25 ` Rafael J. Wysocki
2015-07-22 18:25 ` josh
2015-07-24 22:36 ` Rafael J. Wysocki
2015-07-25 19:50 ` Josh Triplett
2015-07-26 0:03 ` Rafael J. Wysocki
2015-07-26 0:16 ` Josh Triplett
2015-07-27 13:30 ` Rafael J. Wysocki
2015-07-27 11:50 ` Jani Nikula
2015-07-06 16:33 ` Kristen Accardi
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