Bug 31152 - to reduce power consumption: Enable Audio codec power management
Summary: to reduce power consumption: Enable Audio codec power management
Status: NEW
Alias: None
Product: Branch p7
Classification: Distributions
Component: startup (show other bugs)
Version: не указана
Hardware: all Linux
: P3 enhancement
Assignee: Andrey Cherepanov
QA Contact: qa-p7@altlinux.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-07-17 18:06 MSK by Ivan Zakharyaschev
Modified: 2015-07-17 19:21 MSK (History)
0 users

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Description Ivan Zakharyaschev 2015-07-17 18:06:17 MSK
startup-0.9.8.38-alt1

According to powertop , on my laptop (Dell Latitude), the things that constantly consumed most power were:

Audio codec hwC0D3: Intel
Audio codec hwC0D0: IDT

and powertop even has a "tunable" to mitigate this problem: "Enable Audio codec power management", which has a huge effect indeed.

Can't such a setting be put into the default configuration?
Comment 1 Ivan Zakharyaschev 2015-07-17 18:34:23 MSK
powertop does this:

echo 1 > /sys/module/snd_hda_intel/parameters/power_save
Comment 2 Ivan Zakharyaschev 2015-07-17 19:14:30 MSK
(В ответ на комментарий №0)

> the things that
> constantly consumed most power were:

A tiny clarification:

of course, that's probably not *the* most power consumption, but these things consumed more power than any other thing. (Around 5W-10W)
Comment 3 Ivan Zakharyaschev 2015-07-17 19:21:03 MSK
(In reply to comment #1)
> powertop does this:
> 
> echo 1 > /sys/module/snd_hda_intel/parameters/power_save

Actually, it's not a false/true parameter (as I thought).

# modinfo snd_hda_intel
....
parm:           power_save:Automatic power-saving timeout (in second, 0 = disable). (xint)
parm:           power_save_controller:Reset controller in power save mode. (bool)

One may consider other greater number of seconds, too, if one wants to enable power-saving...