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Old 03-29-2011, 12:59 AM   #1
Tripsun
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Registered: Jan 2011
Distribution: Arch Linux
Posts: 22

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Laptop-mode-tools/cpufrequtils Questions


I am running a Sony Vaio VGN-FW480J and am trying to optimize these two tools to save battery life and hard drive life span. I have added @laptop-mode to my daemon array and acpi-cpufreq to modules in /etc/rc.conf (I am using Arch Linux 64 bit). A few issues I immediately notice:

1) cpufreq doesn't revert back to higher frequencies if I unplug and plug power source back in (before unplugging: CPU 0 - 800 MHz, CPU 1 - 2.00 GHz; after both are 800 and won't change if I plug power source back in)

2) I believe the hard disk is actually spinning down more frequently (and fan is almost always on, even when no work is being done). Here are the relevant files/the ones that I have altered.

Please let me know if you require any additional information. Thank you in advance for any help.

laptop-mode.conf
Code:
###############################################################################
#
# Configuration for Laptop Mode Tools
# -----------------------------------
#
# There is a "system" to the configuration setting names:
#    CONTROL_something=0/1   Determines whether Laptop Mode Tools controls 
#                            something
#    LM_something=value      Value of "something" when laptop mode is active
#    NOLM_something=value    Value of "something" when laptop mode is NOT
#                            active
#    AC_something=value      Value of "something" when the computer is running
#                            on AC power
#    BATT_something=value    Value of "something when the computer is running
#                            on battery power
#
# There can be combinations of LM_/NOLM_ and AC_/BATT_ prefixes, but the
# available prefixes are different for each setting. The available ones are 
# documented in the manual page, laptop-mode.conf(8). If there is no LM_/
# NOLM_ in a setting name, then the value is used independently of laptop
# mode state, and similarly, if there is no AC_/BATT_, then the value is used
# independently of power state.
#
# Some options only work on ACPI systems. They are marked ACPI-ONLY.
#
# Note that this configuration file is a fragment of shell script: you
# can use all the features of the shell scripting language to achieve your
# desired configuration.
#
# 
# Modules
# -------
#
# Laptop Mode Tools modules have separate configuration files, that can be
# found in /etc/laptop-mode/conf.d. Please look through these configuration
# files as well, there are many useful power saving tools in there!
#
###############################################################################


###############################################################################
# Enable/Disable laptop-mode-tools execution
# ------------------------------------------
# Set it to 0 to completely disable laptop-mode-tools from running
###############################################################################
#
ENABLE_LAPTOP_MODE_TOOLS=1


###############################################################################
# Configuration debugging
# -----------------------
###############################################################################

#
# Set this to 1 if you want to see a lot of information when you start/stop 
# laptop_mode.
#
VERBOSE_OUTPUT=0

# Set this to 1 if you want to log messages to syslog
LOG_TO_SYSLOG=1

# Run in shell debug mode
# Enable this if you would like to execute the entire laptop-mode-tools program
# in shell debug mode. Warning: This will create a lot of text output
# If you are debugging an individual module, perhaps you would want to enable
# each module specific debug mode (available in module conf files)
DEBUG=0

###############################################################################
# When to enable laptop mode
# --------------------------
#
# "Laptop mode" is the mode in which laptop mode tools makes the computer
# consume less power. This includes the kernel "laptop_mode" feature, which
# allows your hard drives to spin down, as well as various other settings which
# can be tweaked by laptop mode tools. You can enable or disable all of these
# settings using the CONTROL_... options further down in this config file.
###############################################################################


#
# Enable laptop mode when on battery power.
#
ENABLE_LAPTOP_MODE_ON_BATTERY=1


#
# Enable laptop mode when on AC power.
#
ENABLE_LAPTOP_MODE_ON_AC=1


#
# Enable laptop mode when the laptop's lid is closed, even when we're on AC
# power? (ACPI-ONLY)
#
ENABLE_LAPTOP_MODE_WHEN_LID_CLOSED=0


#
# Enable all simple zero-configuration auto modules
# This option enables all simple modules (listed below) without requiring
# the user to enable each module individually
#
# List of modules which can be automatically enabled with this setting are:
#
# ac97-powersave
# cpufreq
# dpms-standby
# eee-superhe
# ethernet
# exec-commands
# hal-polling
# hdparm
# intel-hda-powersave
# intel-sata-powermgmt
# runtime-pm
# sched-mc-power-savings
# sched-smt-power-savings
# terminal-blanking
# usb-autosuspend
# wireless-ipw-power
# wireless-iwl-power
# wireless-power
#
# Set this to 1 to enable all simple zero-configuration auto modules listed above.
#
# NOTE: You can explicitly enable/disable any of the above modules by changing their
# values in the individual settings file
#
ENABLE_AUTO_MODULES=1



###############################################################################
# When to enable data loss sensitive features
# -------------------------------------------
#
# When data loss sensitive features are disabled, laptop mode tools acts as if
# laptop mode were disabled, for those features only.
#
# Data loss sensitive features include:
# - laptop_mode (i.e., delayed writes)
# - hard drive write cache
#
# All of the options that follow can be set to 0 in order to prevent laptop
# mode tools from using them to stop data loss sensitive features. Use this
# when you have a battery that reports the wrong information, that confuses
# laptop mode tools.
#
# Disabling data loss sensitive features is ACPI-ONLY, and it only works if
# your battery gives off frequent ACPI events to indicate a change in battery
# level.
#
# NOTE: If your battery does NOT give off battery events often enough, you can
# enable the battery-level-polling module to make this work. Look at the
# file /etc/laptop-mode/conf.d/battery-level-polling.conf for more information.
#
###############################################################################


#
# Disable all data loss sensitive features when the battery level (in % of the
# battery capacity) reaches this value.
#
MINIMUM_BATTERY_CHARGE_PERCENT=3


#
# Disable data loss sensitive features when the battery reports its state
# as "critical".
#
DISABLE_LAPTOP_MODE_ON_CRITICAL_BATTERY_LEVEL=1



###############################################################################
# Controlled hard drives and partitions
# -------------------------------------
#
# For spinning down your hard drives, laptop mode will remount file systems and
# adjust hard drive spindown timeouts. These parameters specify which
# devices and partitions are affected by laptop mode.
###############################################################################


#
# The drives that laptop mode controls.
# Separate them by a space, e.g. HD="/dev/hda /dev/hdb". The default is a
# wildcard, which will get you all your IDE and SCSI/SATA drives.
#
HD="/dev/[hs]d[abcdefgh]"


#
# The partitions (or mount points) that laptop mode controls.
# Separate the values by spaces. Use "auto" to indicate all partitions on drives
# listed in HD. You can add things to "auto", e.g. "auto /dev/hdc3". You can
# also specify mount points, e.g. "/mnt/data".
#
PARTITIONS="auto /dev/mapper/*"


#
# If this is enabled, laptop mode tools will assume that SCSI drives are
# really SATA drives that only _look_ like SCSI drives, and will use hdparm
# to control them. Set this to 0 if you have /dev/sd devices and you want
# laptop mode tools to use the "sdparm" command to control them. 
#
ASSUME_SCSI_IS_SATA=1


###############################################################################
# Hard drive behaviour settings
# -----------------------------
#
# These settings specify how laptop mode tools will adjust the various
# parameters of your hard drives and file systems.
###############################################################################


#
# Maximum time, in seconds, of work that you are prepared to lose when your
# system crashes or power runs out. This is the maximum time that Laptop Mode
# will keep unsaved data waiting in memory before spinning up your hard drive.
#
LM_BATT_MAX_LOST_WORK_SECONDS=600
LM_AC_MAX_LOST_WORK_SECONDS=360


#
# Should laptop mode tools control readahead?
#
CONTROL_READAHEAD=1


#
# Read-ahead, in kilobytes. You can spin down the disk while playing MP3/OGG
# by setting the disk readahead to a reasonable size, e.g. 3072 (3 MB).
# Effectively, the disk will read a complete MP3 at once, and will then spin 
# down while the MP3/OGG is playing. Don't set this too high, because the 
# readahead is applied to _all_ files that are read from disk.
#
LM_READAHEAD=3072
NOLM_READAHEAD=128


#
# Should laptop mode tools add the "noatime" option to the mount options when 
# laptop mode is enabled?
#
CONTROL_NOATIME=0

# Should laptop use relatime instead of noatime? The "relatime" mount option has
# more standards-compliant semantics, and allows more applications to work,
# while retaining a low level of atime updates (i.e., disk writes).
USE_RELATIME=0


#
# Should laptop mode tools control the hard drive idle timeout settings?
#
CONTROL_HD_IDLE_TIMEOUT=1


#
# Idle timeout values. (hdparm -S)
# Default is 2 hours on AC (NOLM_HD_IDLE_TIMEOUT_SECONDS=7200) and 20 seconds
# for battery and for AC with laptop mode on.
#
LM_AC_HD_IDLE_TIMEOUT_SECONDS=20
LM_BATT_HD_IDLE_TIMEOUT_SECONDS=20
NOLM_HD_IDLE_TIMEOUT_SECONDS=7200


#
# Should laptop mode tools control the hard drive power management settings?
#
# Set to 0 to disable
CONTROL_HD_POWERMGMT="auto"


#
# Power management for HD (hdparm -B values)
#
BATT_HD_POWERMGMT=128
LM_AC_HD_POWERMGMT=254
NOLM_AC_HD_POWERMGMT=254


#
# Should laptop mode tools control the hard drive write cache settings?
#
CONTROL_HD_WRITECACHE=0


#
# Write cache settings for HD (hdparm -W values)
#
NOLM_AC_HD_WRITECACHE=1
NOLM_BATT_HD_WRITECACHE=0
LM_HD_WRITECACHE=0




###############################################################################
# Settings you probably don't want to touch
# -----------------------------------------
#
# It is usually not necessary to change these parameters. They are included
# for completeness' sake.
###############################################################################


#
# Change mount options on partitions in PARTITIONS? You don't really want to
# disable this. If you do, then your hard drives will probably not spin down
# anymore.
#
CONTROL_MOUNT_OPTIONS=1


#
# Dirty synchronous ratio.  At this percentage of dirty pages the process
# which calls write() does its own writeback.
#
LM_DIRTY_RATIO=60
NOLM_DIRTY_RATIO=40


#
# Allowed dirty background ratio, in percent.  Once DIRTY_RATIO has been
# exceeded, the kernel will wake pdflush which will then reduce the amount
# of dirty memory to dirty_background_ratio.  Set this nice and low, so once
# some writeout has commenced, we do a lot of it.
#
LM_DIRTY_BACKGROUND_RATIO=1
NOLM_DIRTY_BACKGROUND_RATIO=10


#
# kernel default settings -- don't touch these unless you know what you're 
# doing.
#
DEF_UPDATE=5
DEF_XFS_AGE_BUFFER=15
DEF_XFS_SYNC_INTERVAL=30
DEF_XFS_BUFD_INTERVAL=1
DEF_MAX_AGE=30


#
# This must be adjusted manually to the value of HZ in the running kernel
# on 2.4, until the XFS people change their 2.4 external interfaces to work in
# centisecs. This can be automated, but it's a work in progress that still
# needs some fixes. On 2.6 kernels, XFS uses USER_HZ instead of HZ for
# external interfaces, and that is currently always set to 100. So you don't
# need to change this on 2.6.
#
XFS_HZ=100


#
# Seconds laptop mode has to to wait after the disk goes idle before doing
# a sync.
#
LM_SECONDS_BEFORE_SYNC=2
cpufreq.conf
Code:
#
# Configuration file for Laptop Mode Tools module cpufreq.
#
# For more information, consult the laptop-mode.conf(8) manual page.
#

###############################################################################
# CPU frequency scaling and throttling
# ------------------------------------
#
# Laptop mode tools can automatically adjust your kernel CPU frequency
# settings. This includes upper and lower limits and scaling governors.
# There is also support for CPU throttling, on systems that don't support
# frequency scaling.
#
# This feature only works on 2.6 kernels.
#
#
# IMPORTANT: In versions 1.36 and earlier, these settings were included in the
# main laptop-mode.conf configuration file. If they are still present, they
# overrule the settings in this file. To fix this, simply delete the settings
# from the main config file.
#
###############################################################################

# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0

#
# Should laptop mode tools control the CPU frequency settings?
#
# Set to 0 to disable
CONTROL_CPU_FREQUENCY="auto"


#
# Legal values are "slowest" for the slowest speed that your
# CPU is able to operate at, "fastest" for the fastest speed,
# "medium" for some value in the middle, or any value listed in
# /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_frequencies.
# The "governor" can be any governor installed on your system, this usually
# includes "ondemand", "conservative", and "performance". The
# "IGNORE_NICE_LOAD" setting specifies that background programs that have
# a low priority ("nice level") should not cause the CPU frequency to
# be increased. (You generally want this to be enabled in battery mode.)
#
BATT_CPU_MAXFREQ=fastest
BATT_CPU_MINFREQ=slowest
BATT_CPU_GOVERNOR=ondemand
BATT_CPU_IGNORE_NICE_LOAD=1
LM_AC_CPU_MAXFREQ=fastest
LM_AC_CPU_MINFREQ=slowest
LM_AC_CPU_GOVERNOR=ondemand
LM_AC_CPU_IGNORE_NICE_LOAD=1
NOLM_AC_CPU_MAXFREQ=fastest
NOLM_AC_CPU_MINFREQ=slowest
NOLM_AC_CPU_GOVERNOR=ondemand
NOLM_AC_CPU_IGNORE_NICE_LOAD=0


#
# Should laptop mode tools control the CPU throttling? This is only useful
# on processors that don't have frequency scaling.
# (Only works when you have /proc/acpi/processor/CPU*/throttling.)
# 
# This is only useful on older P4 processors that do not support frequency
# scaling. On such processors, this is the only way to reduce power consumption
# but at the cost of higher performance penalty.
#
# Enable this only if you have a processor that does not support frequency scaling
# On most new processors, you might want to disable it.
#
# Set to 0 to disable.
CONTROL_CPU_THROTTLING=0


#
# Legal values are "maximum" for the maximum (slowest) throttling level,
# "minimum" for minimum (fastest) throttling level, "medium" for a value
# somewhere in the middle (this is usually 50% for P4s), or any value listed
# in /proc/acpi/processor/CPU*/throttling. Be careful when using "maximum":
# this may be _very_ slow (in fact, with P4s it slows down the processor
# by a factor 8).
#
BATT_CPU_THROTTLING=medium
LM_AC_CPU_THROTTLING=medium
NOLM_AC_CPU_THROTTLING=minimum
battery-level-polling.conf
Code:
#
# Configuration file for Laptop Mode Tools module battery-level-polling.
#
# For more information, consult the laptop-mode.conf(8) manual page.
#

###############################################################################
# Battery level polling settings
# ------------------------------
#
# This module allows laptop mode to react to battery level changes, even if the
# battery does not send out frequent ACPI events for such battery level changes.
#
# Note that this does NOT make ACPI-only features work on non-ACPI hardware.
###############################################################################

# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0

#
# Enable this setting to enable battery level polling.
#
ENABLE_BATTERY_LEVEL_POLLING=1
hal-polling.conf
Code:
#
# Configuration file for Laptop Mode Tools module hal-polling.
#
# For more information, consult the laptop-mode.conf(8) manual page.
#


###############################################################################
# HAL polling settings
# --------------------
#
# If you enable this module, laptop mode tools will control the polling of
# your CD/DVD drives by HAL. Disabling polling saves a considerable amount of
# power, but for some older CD/DVD drives it means that inserted CDs are no
# longer autodetected. In such cases, you must turn this option off.
# Alternatively, you can configure laptop mode tools to turn HAL polling on only
# when the laptop is running on AC power. This would mean that CDs are not
# autodetected while the laptop is running on battery power, but the power
# savings may be worth the extra manual labour when you insert a CD.
#
###############################################################################

# Enable debug mode for this module
# Set to 1 if you want to debug this module
DEBUG=0

# Control HAL polling?
# Set to 0 to disablei, vs "auto".
CONTROL_HAL_POLLING=0

# Disable HAL polling on battery?
BATT_DISABLE_HAL_POLLING=0

# Disable HAL polling on AC?
AC_DISABLE_HAL_POLLING=0

# Drives to apply HAL polling settings to
HAL_POLLING_DEVICES="/dev/scd?"

Last edited by Tripsun; 03-29-2011 at 01:08 AM.
 
Old 03-29-2011, 04:52 PM   #2
markush
Senior Member
 
Registered: Apr 2007
Location: Germany
Distribution: Slackware
Posts: 3,979

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Hello tripsun,

could you please post the output of
Code:
cpufreq-info
and
Code:
uname -a
If you configure for the governor "ondemand" or "conservative" you should experience the desired functions.

Markus
 
Old 03-29-2011, 08:54 PM   #3
Tripsun
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Registered: Jan 2011
Distribution: Arch Linux
Posts: 22

Original Poster
Rep: Reputation: 0
uname -a
Code:
Linux arch 2.6.37-ARCH #1 SMP PREEMPT Fri Mar 25 15:10:00 CET 2011 x86_64 Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz GenuineIntel GNU/Linux
Ok, so I changed it to:

Code:
BATT_CPU_MAXFREQ=fastest
BATT_CPU_MINFREQ=slowest
BATT_CPU_GOVERNOR=conservative
BATT_CPU_IGNORE_NICE_LOAD=1
LM_AC_CPU_MAXFREQ=fastest
LM_AC_CPU_MINFREQ=slowest
LM_AC_CPU_GOVERNOR=ondemand
LM_AC_CPU_IGNORE_NICE_LOAD=1
NOLM_AC_CPU_MAXFREQ=fastest
NOLM_AC_CPU_MINFREQ=slowest
NOLM_AC_CPU_GOVERNOR=ondemand
NOLM_AC_CPU_IGNORE_NICE_LOAD=0
Now when I am plugged in, cpufreq-info shows ondemand being used. When I unplug the power cord, it stays at ondemand though. If I boot computer without power plug, cpufreq-info shows conservative. If I plug in powersource, cpufreq-info still shows the governor as "conservative" (waited a few minutes since I didn't know how often it was polling battery). Why is it not detecting if I am plugged in/switching governor?

Also, I have been using ondemand for most of the day now and it renders the system much slower. It's laggy and often has to wait a few seconds to load something (and hard disk spins up). If I am simply reading a web page for a few seconds things slow down and if I want to do something as simple as type ls in a terminal it takes a few seconds for computer to get going and spit out output of ls. This is frequent and quite annoying (which makes me want to use performance unless there is a way around this for when I am plugged in).

And so I have been using performance for last hour or so and I still notice this laggyness occasionally (not as often); quite often, the disk spins up which it did less frequently when I didn't have laptop-mode installed. Are there other settings that I need to edit? Maybe I should just disable laptop-mode when it's plugged in (this is an option), but I then need to fix the above issue dealing with it not realizing when I am plugged in or not.

Another random question: are the following settings correct (I have already manually added noatime in fstab for all partitions besides swap)

From laptop-mode.conf
Code:
CONTROL_READAHEAD=1

LM_READAHEAD=3072
NOLM_READAHEAD=128


CONTROL_NOATIME=0
USE_RELATIME=0

CONTROL_HD_IDLE_TIMEOUT=1
Thanks for all the help!

Last edited by Tripsun; 03-29-2011 at 09:03 PM.
 
Old 03-30-2011, 02:06 AM   #4
markush
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Registered: Apr 2007
Location: Germany
Distribution: Slackware
Posts: 3,979

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Hello Tripsun,

I've once used Arch, they have a good documentation, but I remember that I configured may Laptop for a battery-runlevel with Gentoo, here is the documentation: http://www.gentoo.org/doc/en/power-management-guide.xml

On my system with an AMD prozessor the governor "conservative" always uses the lowest possible frequency. On my system the two governors "conservative" and "ondemand" act in the same way.

I'd further recommend to check if the appropriate modules are loaded. Unfortunately one cannot compare your and my system since AMD and Intel use different modules, for my laptop the module powernow-k8 has to be loaded and when I search for it I get:
Code:
markus@samsung:~$ lsmod | grep -i k8
powernow_k8            12868  0 
freq_table              2411  2 cpufreq_ondemand,powernow_k8
mperf                   1171  1 powernow_k8
processor              24354  1 powernow_k8
Markus

Last edited by markush; 03-30-2011 at 10:51 AM. Reason: typo
 
Old 03-30-2011, 10:43 AM   #5
Tripsun
LQ Newbie
 
Registered: Jan 2011
Distribution: Arch Linux
Posts: 22

Original Poster
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Thank you for the response. I installed acpid (only had acpi installed previously), added it to daemon array, which now looks like this:

Code:
DAEMONS=(syslog-ng dbus @wicd @acpid @netfs @laptop-mode @crond @cups @alsa @mpd)
I have tried the following several times with identical results each time:
If I log in with power source plugged in, cpufreq shows performance (as expected). If I unplug the power cord, cpufreq-info now shows conservative. At the same time, however, a small popping noise comes from somewhere near speakers, and my wired internet connection gets lost (using wicd) and I am unable to get it back (it is no longer listed in wicd). If I plug power cord back in, cpufreq still shows conservative. Any idea what's going on?
 
Old 03-30-2011, 10:54 AM   #6
markush
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Do you have Windows running or did you have any other Linuxdistribution installed before you installed Arch? What I mean is, can you verify that the hardware of your laptop is working properly?

Markus
 
Old 03-30-2011, 11:08 AM   #7
Tripsun
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Registered: Jan 2011
Distribution: Arch Linux
Posts: 22

Original Poster
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Windows 7, no issues there (battery life is ~ 3 hours, vs only ~1 on arch which is what I am trying to prolong). No issues as far as I know.

The only other thing I can't get to work on linux is suspend/resume - not sure if this is related.

Last edited by Tripsun; 03-30-2011 at 11:13 AM.
 
  


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