구차니의 잡동사니 모음

$ cat /var/log/Xorg.0.log

[    12.115]

X.Org X Server 1.17.2

Release Date: 2015-06-16

[    12.115] X Protocol Version 11, Revision 0

[    12.115] Build Operating System: Linux 3.8.11-2-ARCH armv7l Raspbian

[    12.116] Current Operating System: Linux raspberrypi 4.4.21-v7+ #911 SMP Thu Sep 15 14:22:38 BST 2016 armv7l

[    12.116] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2709.boardrev=0xa21041 bcm2709.serial=0xd6f44150 smsc95xx.macaddr=B8:27:EB:F4:41:50 bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

[    12.117] Build Date: 11 January 2016  01:32:44PM

[    12.117] xorg-server 2:1.17.2-1+rpi1 (http://www.debian.org/support)

[    12.117] Current version of pixman: 0.33.3

[    12.117]    Before reporting problems, check http://wiki.x.org

        to make sure that you have the latest version.

[    12.117] Markers: (--) probed, (**) from config file, (==) default setting,

        (++) from command line, (!!) notice, (II) informational,

        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.

[    12.118] (==) Log file: "/var/log/Xorg.0.log", Time: Tue Oct 18 23:41:41 2016

[    12.168] (==) Using system config directory "/usr/share/X11/xorg.conf.d"

[    12.183] (==) No Layout section.  Using the first Screen section.

[    12.183] (==) No screen section available. Using defaults.

[    12.183] (**) |-->Screen "Default Screen Section" (0)

[    12.184] (**) |   |-->Monitor "<default monitor>"

[    12.190] (==) No device specified for screen "Default Screen Section".

        Using the first device section listed.

[    12.190] (**) |   |-->Device "Allwinner A10/A13 FBDEV"

[    12.190] (==) No monitor specified for screen "Default Screen Section".

        Using a default monitor configuration.

[    12.191] (==) Automatically adding devices

[    12.191] (==) Automatically enabling devices

[    12.191] (==) Automatically adding GPU devices

[    12.202] (WW) The directory "/usr/share/fonts/X11/misc" does not exist.

[    12.202]    Entry deleted from font path.

[    12.202] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.

[    12.202]    Entry deleted from font path.

[    12.208] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.

[    12.208]    Entry deleted from font path.

[    12.218] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.

[    12.219]    Entry deleted from font path.

[    12.219] (==) FontPath set to:

        /usr/share/fonts/X11/100dpi/:unscaled,

        /usr/share/fonts/X11/Type1,

        /usr/share/fonts/X11/100dpi,

        built-ins

[    12.219] (==) ModulePath set to "/usr/lib/xorg/modules"

[    12.219] (II) The server relies on udev to provide the list of input devices.

        If no devices become available, reconfigure udev or disable AutoAddDevices.

[    12.219] (II) Loader magic: 0x54cf1f00

[    12.219] (II) Module ABI versions:

[    12.219]    X.Org ANSI C Emulation: 0.4

[    12.219]    X.Org Video Driver: 19.0

[    12.219]    X.Org XInput driver : 21.0

[    12.219]    X.Org Server Extension : 9.0

[    12.220] (II) no primary bus or device found

[    12.222] (II) LoadModule: "glx"

[    12.227] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so

[    12.323] (II) Module glx: vendor="X.Org Foundation"

[    12.323]    compiled for 1.17.2, module version = 1.0.0

[    12.323]    ABI class: X.Org Server Extension, version 9.0

[    12.323] (==) AIGLX enabled

[    12.323] (II) LoadModule: "fbturbo"

[    12.340] (II) Loading /usr/lib/xorg/modules/drivers/fbturbo_drv.so

[    12.346] (II) Module fbturbo: vendor="X.Org Foundation"

[    12.346]    compiled for 1.17.2, module version = 0.5.1

[    12.346]    Module class: X.Org Video Driver

[    12.346]    ABI class: X.Org Video Driver, version 19.0

[    12.346] (II) FBTURBO: driver for framebuffer: fbturbo

[    12.347] (++) using VT number 7

[    12.361] (WW) Falling back to old probe method for fbturbo

[    12.361] (II) Loading sub module "fbdevhw"

[    12.361] (II) LoadModule: "fbdevhw"

[    12.363] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so

[    12.367] (II) Module fbdevhw: vendor="X.Org Foundation"

[    12.367]    compiled for 1.17.2, module version = 0.0.2

[    12.367]    ABI class: X.Org Video Driver, version 19.0

[    12.367] (II) FBTURBO(0): using /dev/fb0

[    12.367] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support

[    12.368] (II) FBTURBO(0): Creating default Display subsection in Screen section

        "Default Screen Section" for depth/fbbpp 24/32

[    12.368] (==) FBTURBO(0): Depth 24, (==) framebuffer bpp 32

[    12.368] (==) FBTURBO(0): RGB weight 888

[    12.368] (==) FBTURBO(0): Default visual is TrueColor

[    12.368] (==) FBTURBO(0): Using gamma correction (1.0, 1.0, 1.0)

[    12.368] (II) FBTURBO(0): hardware: BCM2708 FB (video memory: 1066kB)

[    12.369] (**) FBTURBO(0): Option "fbdev" "/dev/fb0"

[    12.369] (**) FBTURBO(0): Option "SwapbuffersWait" "true"

[    12.370] (II) FBTURBO(0): processor: ARM Cortex-A7

[    12.370] (II) FBTURBO(0): checking modes against framebuffer device...

[    12.370] (II) FBTURBO(0): checking modes against monitor...

[    12.371] (--) FBTURBO(0): Virtual size is 656x416 (pitch 656)

[    12.371] (**) FBTURBO(0):  Built-in mode "current"

[    12.371] (==) FBTURBO(0): DPI set to (96, 96)

[    12.371] (II) Loading sub module "fb"

[    12.371] (II) LoadModule: "fb"

[    12.371] (II) Loading /usr/lib/xorg/modules/libfb.so

[    12.392] (II) Module fb: vendor="X.Org Foundation"

[    12.392]    compiled for 1.17.2, module version = 1.0.0

[    12.393]    ABI class: X.Org ANSI C Emulation, version 0.4

[    12.393] (==) Depth 24 pixmap format is 32 bpp

[    12.427] (II) FBTURBO(0): using backing store heuristics

[    12.447] (II) FBTURBO(0): can't load 'g2d_23' kernel module

[    12.448] (II) FBTURBO(0): failed to enable the use of sunxi display controller

[    12.448] (II) FBTURBO(0): No sunxi-g2d hardware detected (check /dev/disp and /dev/g2d)

[    12.460] (II) FBTURBO(0): G2D hardware acceleration can't be enabled

[    12.460] (II) FBTURBO(0): enabled fbdev copyarea acceleration

[    12.460] (==) FBTURBO(0): Backing store enabled

[    12.473] (==) FBTURBO(0): DPMS enabled

[    12.473] (II) FBTURBO(0): failed to enable hardware cursor

[    12.473] (II) FBTURBO(0): no 3D acceleration because the driver has been compiled without libUMP

[    12.473] (II) FBTURBO(0): if this is wrong and needs to be fixed, please check ./configure log

[    12.473] (==) RandR enabled

[    12.674] (II) SELinux: Disabled on system

[    12.686] (II) AIGLX: Screen 0 is not DRI2 capable

[    12.686] (EE) AIGLX: reverting to software rendering

[    14.446] (II) AIGLX: Loaded and initialized swrast

[    14.446] (II) GLX: Initialized DRISWRAST GL provider for screen 0 

$ cat /var/log/Xorg.0.log

[    13.967]

X.Org X Server 1.17.2

Release Date: 2015-06-16

[    13.967] X Protocol Version 11, Revision 0

[    13.967] Build Operating System: Linux 3.8.11-2-ARCH armv7l Raspbian

[    13.968] Current Operating System: Linux raspberrypi 4.4.21-v7+ #911 SMP Thu Sep 15 14:22:38 BST 2016 armv7l

[    13.968] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1920 bcm2708_fb.fbheight=1080 bcm2709.boardrev=0xa21041 bcm2709.serial=0xd6f44150 smsc95xx.macaddr=B8:27:EB:F4:41:50 bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000 bcm2709.disk_led_gpio=47 bcm2709.disk_led_active_low=0 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  dwc_otg.lpm_enable=0 console=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait

[    13.968] Build Date: 11 January 2016  01:32:44PM

[    13.968] xorg-server 2:1.17.2-1+rpi1 (http://www.debian.org/support)

[    13.968] Current version of pixman: 0.33.3

[    13.968]    Before reporting problems, check http://wiki.x.org

        to make sure that you have the latest version.

[    13.968] Markers: (--) probed, (**) from config file, (==) default setting,

        (++) from command line, (!!) notice, (II) informational,

        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.

[    13.969] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Nov  3 11:34:29 2016

[    13.984] (==) Using system config directory "/usr/share/X11/xorg.conf.d"

[    13.988] (==) No Layout section.  Using the first Screen section.

[    13.989] (==) No screen section available. Using defaults.

[    13.989] (**) |-->Screen "Default Screen Section" (0)

[    13.989] (**) |   |-->Monitor "<default monitor>"

[    13.995] (==) No device specified for screen "Default Screen Section".

        Using the first device section listed.

[    13.995] (**) |   |-->Device "Allwinner A10/A13 FBDEV"

[    13.996] (==) No monitor specified for screen "Default Screen Section".

        Using a default monitor configuration.

[    13.996] (==) Automatically adding devices

[    13.996] (==) Automatically enabling devices

[    13.996] (==) Automatically adding GPU devices

[    14.007] (WW) The directory "/usr/share/fonts/X11/misc" does not exist.

[    14.008]    Entry deleted from font path.

[    14.008] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.

[    14.008]    Entry deleted from font path.

[    14.010] (WW) The directory "/usr/share/fonts/X11/75dpi/" does not exist.

[    14.010]    Entry deleted from font path.

[    14.020] (WW) The directory "/usr/share/fonts/X11/75dpi" does not exist.

[    14.021]    Entry deleted from font path.

[    14.021] (==) FontPath set to:

        /usr/share/fonts/X11/100dpi/:unscaled,

        /usr/share/fonts/X11/Type1,

        /usr/share/fonts/X11/100dpi,

        built-ins

[    14.021] (==) ModulePath set to "/usr/lib/xorg/modules"

[    14.021] (II) The server relies on udev to provide the list of input devices.

        If no devices become available, reconfigure udev or disable AutoAddDevices.

[    14.021] (II) Loader magic: 0x54d09f00

[    14.021] (II) Module ABI versions:

[    14.021]    X.Org ANSI C Emulation: 0.4

[    14.021]    X.Org Video Driver: 19.0

[    14.021]    X.Org XInput driver : 21.0

[    14.021]    X.Org Server Extension : 9.0

[    14.022] (II) no primary bus or device found

[    14.025] (II) LoadModule: "glx"

[    14.029] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so

[    14.121] (II) Module glx: vendor="X.Org Foundation"

[    14.121]    compiled for 1.17.2, module version = 1.0.0

[    14.121]    ABI class: X.Org Server Extension, version 9.0

[    14.121] (==) AIGLX enabled

[    14.122] (II) LoadModule: "fbturbo"

[    14.125] (II) Loading /usr/lib/xorg/modules/drivers/fbturbo_drv.so

[    14.130] (II) Module fbturbo: vendor="X.Org Foundation"

[    14.131]    compiled for 1.17.2, module version = 0.5.1

[    14.131]    Module class: X.Org Video Driver

[    14.131]    ABI class: X.Org Video Driver, version 19.0

[    14.131] (II) FBTURBO: driver for framebuffer: fbturbo

[    14.131] (++) using VT number 7

[    14.165] (WW) Falling back to old probe method for fbturbo

[    14.165] (II) Loading sub module "fbdevhw"

[    14.165] (II) LoadModule: "fbdevhw"

[    14.166] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so

[    14.171] (II) Module fbdevhw: vendor="X.Org Foundation"

[    14.172]    compiled for 1.17.2, module version = 0.0.2

[    14.172]    ABI class: X.Org Video Driver, version 19.0

[    14.172] (II) FBTURBO(0): using /dev/fb0

[    14.172] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support

[    14.172] (II) FBTURBO(0): Creating default Display subsection in Screen section

        "Default Screen Section" for depth/fbbpp 24/32

[    14.172] (==) FBTURBO(0): Depth 24, (==) framebuffer bpp 32

[    14.172] (==) FBTURBO(0): RGB weight 888

[    14.173] (==) FBTURBO(0): Default visual is TrueColor

[    14.173] (==) FBTURBO(0): Using gamma correction (1.0, 1.0, 1.0)

[    14.173] (II) FBTURBO(0): hardware: BCM2708 FB (video memory: 8100kB)

[    14.173] (**) FBTURBO(0): Option "fbdev" "/dev/fb0"

[    14.173] (**) FBTURBO(0): Option "SwapbuffersWait" "true"

[    14.174] (II) FBTURBO(0): processor: ARM Cortex-A7

[    14.174] (II) FBTURBO(0): checking modes against framebuffer device...

[    14.174] (II) FBTURBO(0): checking modes against monitor...

[    14.174] (--) FBTURBO(0): Virtual size is 1920x1080 (pitch 1920)

[    14.174] (**) FBTURBO(0):  Built-in mode "current"

[    14.174] (==) FBTURBO(0): DPI set to (96, 96)

[    14.174] (II) Loading sub module "fb"

[    14.174] (II) LoadModule: "fb"

[    14.174] (II) Loading /usr/lib/xorg/modules/libfb.so

[    14.181] (II) Module fb: vendor="X.Org Foundation"

[    14.182]    compiled for 1.17.2, module version = 1.0.0

[    14.182]    ABI class: X.Org ANSI C Emulation, version 0.4

[    14.182] (==) Depth 24 pixmap format is 32 bpp

[    14.207] (II) FBTURBO(0): using backing store heuristics

[    14.218] (II) FBTURBO(0): can't load 'g2d_23' kernel module

[    14.218] (II) FBTURBO(0): failed to enable the use of sunxi display controller

[    14.218] (II) FBTURBO(0): No sunxi-g2d hardware detected (check /dev/disp and /dev/g2d)

[    14.218] (II) FBTURBO(0): G2D hardware acceleration can't be enabled

[    14.218] (II) FBTURBO(0): enabled fbdev copyarea acceleration

[    14.218] (==) FBTURBO(0): Backing store enabled

[    14.230] (==) FBTURBO(0): DPMS enabled

[    14.231] (II) FBTURBO(0): failed to enable hardware cursor

[    14.231] (II) FBTURBO(0): no 3D acceleration because the driver has been compiled without libUMP

[    14.231] (II) FBTURBO(0): if this is wrong and needs to be fixed, please check ./configure log

[    14.231] (==) RandR enabled

[    14.356] (II) SELinux: Disabled on system

[    14.366] (II) AIGLX: Screen 0 is not DRI2 capable

[    14.367] (EE) AIGLX: reverting to software rendering

[    17.188] (II) AIGLX: Loaded and initialized swrast

[    17.189] (II) GLX: Initialized DRISWRAST GL provider for screen 0 

/usr/share/X11/xorg.conf.d $ cat 99-fbturbo.conf

# This is a minimal sample config file, which can be copied to

# /etc/X11/xorg.conf in order to make the Xorg server pick up

# and load xf86-video-fbturbo driver installed in the system.

#

# When troubleshooting, check /var/log/Xorg.0.log for the debugging

# output and error messages.

#

# Run "man fbturbo" to get additional information about the extra

# configuration options for tuning the driver.

Section "Device"

        Identifier      "Allwinner A10/A13 FBDEV"

        Driver          "fbturbo"

        Option          "fbdev" "/dev/fb0"

        Option          "SwapbuffersWait" "true"

EndSection 

Check the ACT LED to determine if the Pi is booting

The ACT LED is essential in determining if the Pi can actually read from the card. It indicates that it can read from the card by blinking, If the ACT LED doesn't blink quickly in an irregular pattern for at least twenty seconds, this indicates that the Pi cannot read from the SD card, and that booting is not taking place. By the way, It doesn't matter if the ACT LED initially starts on or off. It is only the blinking of the ACT LED that is significant. A dim ACT LED also has no significance beyond the fact that you are using a B. From the model B+ onwards, the LED is driven differently, and it wont be dim.

With no SD card inserted, note how the ACT LED behaves (hint, it won't blink!). Now insert a programmed card and that behaviour should change. If it does not, this indicates that Pi cannot see the necessary files on the SD card. For a demonstration, watch this video of a model B: the ACT LED is the one on the left-hand side. Note that on later models the ACT LED will start on on power up, instead as off like the model B. 

With working firmware, Meaning the PI can read files from the card, the ACT LED will flicker intermittently for 20-30 seconds. The LED is actually driven by the software read from the card using a dedicated GPIO pin turning it on whenever the card is read. It can also blink in a regular "Morse" pattern, which usually indicates an error condition. See the Additional Information section at the end of this post for details.  

$ gcc -v

Using built-in specs.

COLLECT_GCC=gcc

COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.9/lto-wrapper

Target: arm-linux-gnueabihf

Configured with: ../src/configure -v --with-pkgversion='Raspbian 4.9.2-10' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.9 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf

Thread model: posix

gcc version 4.9.2 (Raspbian 4.9.2-10) 

~/tools/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/bin $ arm-linux-gnueabihf-gcc -v

Using built-in specs.

COLLECT_GCC=arm-linux-gnueabihf-gcc

COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/4.9/lto-wrapper

Target: arm-linux-gnueabihf

Configured with: ../src/configure -v --with-pkgversion='Raspbian 4.9.2-10' --with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.9 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf

Thread model: posix

gcc version 4.9.2 (Raspbian 4.9.2-10)

~/tools/arm-bcm2708 $ ll

total 20

drwxr-xr-x 7 pi pi 4096 Sep 26 23:28 arm-bcm2708hardfp-linux-gnueabi

drwxr-xr-x 7 pi pi 4096 Sep 26 23:26 arm-bcm2708-linux-gnueabi

drwxr-xr-x 8 pi pi 4096 Sep 26 23:28 arm-rpi-4.9.3-linux-gnueabihf

drwxr-xr-x 7 pi pi 4096 Sep 26 23:30 gcc-linaro-arm-linux-gnueabihf-raspbian

drwxr-xr-x 7 pi pi 4096 Sep 26 23:29 gcc-linaro-arm-linux-gnueabihf-raspbian-x64 

$ cat /etc/init.d/cpufrequtils

#!/bin/sh

### BEGIN INIT INFO

# Provides:       cpufrequtils

# Required-Start: $remote_fs loadcpufreq

# Required-Stop:

# Default-Start:  2 3 4 5

# Default-Stop:

# Short-Description: set CPUFreq kernel parameters

# Description: utilities to deal with CPUFreq Linux

#       kernel support

### END INIT INFO

#

DESC="CPUFreq Utilities"

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

CPUFREQ_SET=/usr/bin/cpufreq-set

CPUFREQ_INFO=/usr/bin/cpufreq-info

CPUFREQ_OPTIONS=""

# use lsb-base

. /lib/lsb/init-functions

# Which governor to use. Must be one of the governors listed in:

#   cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors

#

# and which limits to set. Both MIN_SPEED and MAX_SPEED must be values

# listed in:

#   cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies

# a value of 0 for any of the two variables will disabling the use of

# that limit variable.

#

# WARNING: the correct kernel module must already be loaded or compiled in.

#

# Set ENABLE to "true" to let the script run at boot time.

#

# eg:   ENABLE="true"

#       GOVERNOR="ondemand"

#       MAX_SPEED=1000

#       MIN_SPEED=500

ENABLE="true"

GOVERNOR="ondemand"

MAX_SPEED="0"

MIN_SPEED="0"

check_governor_avail() {

        info="/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors"

        if [ -f $info ] && grep -q "\<$GOVERNOR\>" $info ; then

                return 0;

        fi

        return 1;

}

[ -x $CPUFREQ_SET ] || exit 0

if [ -f /etc/default/cpufrequtils ] ; then

        . /etc/default/cpufrequtils

fi

# if not enabled then exit gracefully

[ "$ENABLE" = "true" ] || exit 0

if [ -n "$MAX_SPEED" ] && [ $MAX_SPEED != "0" ] ; then

        CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --max $MAX_SPEED"

fi

if [ -n "$MIN_SPEED" ] && [ $MIN_SPEED != "0" ] ; then

        CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --min $MIN_SPEED"

fi

if [ -n "$GOVERNOR" ] ; then

        CPUFREQ_OPTIONS="$CPUFREQ_OPTIONS --governor $GOVERNOR"

fi

CPUS=$(cat /proc/stat|sed -ne 's/^cpu\([[:digit:]]\+\).*/\1/p')

RETVAL=0

case "$1" in

        start|force-reload|restart|reload)

                log_action_begin_msg "$DESC: Setting $GOVERNOR CPUFreq governor"

                if check_governor_avail ; then

                        for cpu in $CPUS ; do

                                log_action_cont_msg "CPU${cpu}"

                                $CPUFREQ_SET --cpu $cpu $CPUFREQ_OPTIONS 2>&1 > /dev/null || \

                                        RETVAL=$?

                        done

                        log_action_end_msg $RETVAL ""

                else

                        log_action_cont_msg "disabled, governor not available"

                        log_action_end_msg $RETVAL

                fi

                ;;

        stop)

                ;;

        *)

                echo "Usage: $0 {start|stop|restart|reload|force-reload}"

                exit 1

esac

exit 0 

$ cpufreq-info

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009

Report errors and bugs to cpufreq@vger.kernel.org, please.

analyzing CPU 0:

  driver: BCM2835 CPUFreq

  CPUs which run at the same hardware frequency: 0 1 2 3

  CPUs which need to have their frequency coordinated by software: 0 1 2 3

  maximum transition latency: 355 us.

  hardware limits: 600 MHz - 900 MHz

  available frequency steps: 600 MHz, 900 MHz

  available cpufreq governors: conservative, ondemand, userspace, powersave, performance

  current policy: frequency should be within 600 MHz and 900 MHz.

                  The governor "ondemand" may decide which speed to use

                  within this range.

  current CPU frequency is 600 MHz.

  cpufreq stats: 600 MHz:52.90%, 900 MHz:47.10%  (9)

$ sudo cpufreq-set -g conservative

$ cpufreq-info

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009

Report errors and bugs to cpufreq@vger.kernel.org, please.

analyzing CPU 0:

  driver: BCM2835 CPUFreq

  CPUs which run at the same hardware frequency: 0 1 2 3

  CPUs which need to have their frequency coordinated by software: 0 1 2 3

  maximum transition latency: 355 us.

  hardware limits: 600 MHz - 900 MHz

  available frequency steps: 600 MHz, 900 MHz

  available cpufreq governors: conservative, ondemand, userspace, powersave, performance

  current policy: frequency should be within 600 MHz and 900 MHz.

                  The governor "conservative" may decide which speed to use

                  within this range.

  current CPU frequency is 600 MHz.

  cpufreq stats: 600 MHz:63.64%, 900 MHz:36.36%  (15) 

$ sudo cpufreq-set -g powersave

$ cpufreq-info

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009

Report errors and bugs to cpufreq@vger.kernel.org, please.

analyzing CPU 0:

  driver: BCM2835 CPUFreq

  CPUs which run at the same hardware frequency: 0 1 2 3

  CPUs which need to have their frequency coordinated by software: 0 1 2 3

  maximum transition latency: 355 us.

  hardware limits: 600 MHz - 900 MHz

  available frequency steps: 600 MHz, 900 MHz

  available cpufreq governors: conservative, ondemand, userspace, powersave, performance

  current policy: frequency should be within 600 MHz and 900 MHz.

                  The governor "powersave" may decide which speed to use

                  within this range.

  current CPU frequency is 600 MHz.

  cpufreq stats: 600 MHz:74.84%, 900 MHz:25.16%  (15)

$ sudo cpufreq-set -g performance

$ cpufreq-info

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009

Report errors and bugs to cpufreq@vger.kernel.org, please.

analyzing CPU 0:

  driver: BCM2835 CPUFreq

  CPUs which run at the same hardware frequency: 0 1 2 3

  CPUs which need to have their frequency coordinated by software: 0 1 2 3

  maximum transition latency: 355 us.

  hardware limits: 600 MHz - 900 MHz

  available frequency steps: 600 MHz, 900 MHz

  available cpufreq governors: conservative, ondemand, userspace, powersave, performance

  current policy: frequency should be within 600 MHz and 900 MHz.

                  The governor "performance" may decide which speed to use

                  within this range.

  current CPU frequency is 900 MHz.

  cpufreq stats: 600 MHz:79.71%, 900 MHz:20.29%  (16)