Yet Another Blog

February 17, 2015

Setting environment variables in OpenShift

Filed under: computer, Java, linux, Software — Tags: , , , , — guilleml @ 12:51 pm

If you need to set some environment variables in your GEAR you can use an action hook.
The pre-start action hook will serve you well but if you need to restore those variables after a gear restart, pre-start action hook won’t work.
Post-restart action hook, on the other hand, will execute its actions but I haven’t managed to get the environment variables working. After its execution all environment variables that should have a value were empty.

What I did was to modify pre-start action hook to create environment variables as files under $HOME/.env/user_vars

# Actual script

# Added script for post restart variables

After this, if you execute gear restart, the environment variables will exist and will be accesible from your application.

April 27, 2011

nVidia PowerMizer on Linux

Filed under: computer, linux, Software — Tags: , , , , , , — guilleml @ 11:20 pm

Nvidia settings panel has a tab called powermizer where you can set a power policy. It will change Graphics Clock, Memory Clock and Processor Clock depending on the system graphics load.

First get what modes do your card and driver support:

nvidia-settings -q GPUPerfModes -t

perf=0, nvclock=50, memclock=135, processorclock=101 ; perf=1, nvclock=405, memclock=324, processorclock=810 ; perf=2, nvclock=405,
memclock=1800, processorclock=810 ; perf=3, nvclock=715, memclock=1800, processorclock=1430

I have 4 levels, 0, 1, 2 and 3. 0 is the one I want to set as it sets the clocks to the lower frequency.

If you want to set it to a powersave mode with no scaling you can do it by editing /etc/X11/xorg.conf like this:

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
Option  "Coolbits" "1"
 Option  "RegistryDwords" "PowerMizerEnable=0x1; PerfLevelSrc=0x2222; PowerMizerLevel=0x3; PowerMizerDefault=0x3; PowerMizerDefaultAC=0x3"

enables PowerMizer feature (0×0 would disable it instead). This entry may not be needed since in recent driver versions PowerMizer is enabled by default.


sets the governor approach. 0×2222 means fixed frequencies for both battery and AC mode.


sets the current mode. 0×3 is the lowest, least power intensive mode.


sets the default level on battery. 0×3 is the lowest, least power intensive mode.


sets the default level while with an AC plug. 0×3 is the lowest, least power intensive mode.


October 21, 2009

Broadcom-wl in archlinux 2.6.31

Filed under: computer, linux — Tags: , , , , — guilleml @ 6:51 pm

After upgrading to 2.6.31 my wifi stopped working so I googled a little, I found a few usefull links:

Basically what I did was to execute “makepkg” again in the broadcom-wl package and reinstall it. Then I executed:

#mkinitcpio -p kernel26

Also make sure your rc.conf is rigth, you have to add !b43 and !ssb to your MODULES section.

MODULES=(acpi-cpufreq cpufreq_ondemand lib80211_crypt_wep lib80211_crypt_ccmp lib80211_crypt_tkip wl !ssb !b43 fuse)

Reboot your computer and check that your wifi card is working:


eth0      IEEE 802.11  Nickname:””
Access Point: Not-Associated
Link Quality:5  Signal level:206  Noise level:165
Rx invalid nwid:0  invalid crypt:0  invalid misc:0

Then you can use wicd or networkManager to connect to your network.

October 8, 2008

Dell Inspiron 1525 hotkeys in KDE 4.1.1 Debian

Filed under: computer, linux, Software — Tags: , , , , , , , , , — guilleml @ 7:57 am

In Kubuntu 8.04 my laptop multimedia keys worked fine but in KDE 4.1.1 under Debian they didn’t, I couldn’t assign them to actions in system preferences.

To solve it I’ve used xbindkeys, it works pretty nice and now I can control the volume with the volume keys. To do so, type:

#aptitude install xbindkeys xbindkeys-config

Now you can use xbindkeys-config to configure using a graphical interface or you can configure in ~/.xbindkeysrc.

To configure volume keys under kde 4.1.1 you will need to assign some actions to each key in order to increase, decrease or mute the volume, I’ve used qdbus and kmix to do that, for example, if you want to  mute the audio:

$qdbus org.kde.kmix /Mixer0 org.kde.KMix.toggleMute Master:0

So you need to assign that to the mute key. To increase the volume:

$qdbus org.kde.kmix /Mixer0 org.kde.KMix.increaseVolume Master:0

And to decrease the volume:

$qdbus org.kde.kmix /Mixer0 org.kde.KMix.decreaseVolume Master:0

So the xbindkeysrc file will be:

“qdbus org.kde.kmix /Mixer0 org.kde.KMix.toggleMute Master:0”
m:0x0 + c:160

“qdbus org.kde.kmix /Mixer0 org.kde.KMix.increaseVolume Master:0”
m:0x0 + c:176

“qdbus org.kde.kmix /Mixer0 org.kde.KMix.decreaseVolume Master:0”
m:0x0 + c:174

After that you want to run xbindkeys daemon every time you login with your user, so add it to ~/.xinitrc, ~/.kde4/Autostart or any way you know to do so.

September 19, 2008

PHC-Control in Debian Lenny

Filed under: computer, linux, Software — Tags: , , , , , , — guilleml @ 5:42 pm

To build your own module for undervolting your CPU you’ll need some files:

linux-phc-0.3.1 from

linux-source and headers from aptitude:

aptitude install build-essential linux-source-2.6.26 linux-headers-2.6.24-1-amd64

Go to /usr/src and untar the linux source:

tar xvfj linux-source-2.6.26.tar.bz2

Apply the patch and build the module:

cd linux-source-2.6.26

cp /boot/config-2.6.26-1-amd64 .config

cp /usr/src/linux-headers-2.6.26-1-amd64/Module.symvers /usr/src/linux-source-2.6.26

patch -p1 < linux-phc-0.3.1-kernel-vanilla-2.6.26rc8.patch

make oldconfig

make prepare

make scripts

make M=./arch/x86/kernel/cpu/cpufreq

mv /usr/src/linux-source-2.6.26/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko /usr/src/linux-source-2.6.26/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko_old

mv /lib/modules/2.6.26-1-amd64/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko \

cp /usr/src/linux-source-2.6.26/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko /lib/modules/2.6.26-1-amd64/kernel/arch/x86/kernel/cpu/cpufreq/

And that’s all

Edit: Thanks to Andrew for the correction, there was an error I made writing the commands to the blog.

September 9, 2008

Increase battery life in your linux laptop

Filed under: computer, hacks, linux, Software — Tags: , , , , , , , , , — guilleml @ 7:10 pm

Recently I’ve bought a laptop, Dell Inspiron 1525 with a T5750@2Ghz and a 9 cell battery.

I installed KDE4, plasma, desktop effects…it’s cool, really cool,  but then I discovered powertop, a tool that is able to recommend some settings to make  your CPU to awake less times every second. The tools shows yo a list of the tasks that are awaking the CPU so you can try to get a more power-efficent system.

It recomends you some actions to take, you just accept or not them, as set the SATA bus in low-power mode, USB autosuspend, set ondemand cpu freq governor, delay writing to the hard disc, etc…

I noted KDE4 is cool but not when you’re using the battery so I installed fluxbox and XFCE, both are nice, XFCE seems to wake up less the CPU, then I started to look for scripts and patchs to waste less energy.

So here are the tuning I’ve done to my laptop:



# Go fast on AC power.  Similar to default Ubuntu settings
if on_ac_power; then
# Set the drive to mostly stay awake
hdparm -B254 -M 254 /dev/sda

# Remount ext3 filesystems so the journal commit only happens every 60
# seconds.  By default this is 5 but, I prefer to reduce the disk
# activity a bit.
mount -o remount,commit=60 /
mount -o remount,commit=60 /media/sda3

# Turn off the laptop mode disk optimization
echo 0 > /proc/sys/vm/laptop_mode

# Manually set the wifi driver to no power savings.
#echo 6 > /sys/bus/pci/drivers/iwl????/0000\:??\:00.0/power_level

# Set kernel dirty page value back to default
echo 10 > /proc/sys/vm/dirty_ratio
echo 5 > /proc/sys/vm/dirty_background_ratio

# Only wakeup every 60 seconds to see if we need to write dirty pages
# By default this is every 5 seconds but, I prefer 60 to reduce disk
# activity.
echo 6000 > /proc/sys/vm/dirty_writeback_centisecs

# Turn off sound card power savings
echo 0 > /sys/module/snd_hda_intel/parameters/power_save

# Set the SATA to max performance
echo max_performance > /sys/class/scsi_host/host2/link_power_management_policy
echo max_performance > /sys/class/scsi_host/host3/link_power_management_policy
echo max_performance > /sys/class/scsi_host/host4/link_power_management_policy

# Make sure ondemand governor is set
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

# Enable the webcam driver
#  modprobe uvcvideo

else # Save power

# Set the disks to aggressively save power and use the lowest acoustic
# level.  Note: Currently Firefox is very poorly behaved and some
# might find these settings too aggressive.  If so, change “-S 4” to
# something larger like -S 24 (two minutes).
hdparm -B180  /dev/sda

#set the LCD bright to 60%

echo 60 > /proc/acpi/video/VID/LCD/brightness

# Change the ext3 commit times to 10 minutes.  This reduces disk
# activity
mount -o remount,commit=600 /

# Set laptop disk write mode
echo 5 > /proc/sys/vm/laptop_mode

# Manually set the iwl3945 driver to power savings.
#echo 5 > /sys/bus/pci/drivers/iwl????/0000\:??\:00.0/power_level

# Reduce disk activity by waiting up to 10 minutes before doing writes
echo 90 > /proc/sys/vm/dirty_ratio
echo 1 > /proc/sys/vm/dirty_background_ratio
echo 60000 > /proc/sys/vm/dirty_writeback_centisecs

# Set sound card power savings
echo 10 > /sys/module/snd_hda_intel/parameters/power_save

# Set SATA to minimum power
echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
echo min_power > /sys/class/scsi_host/host1/link_power_management_policy
echo min_power > /sys/class/scsi_host/host2/link_power_management_policy
echo min_power > /sys/class/scsi_host/host3/link_power_management_policy
echo min_power > /sys/class/scsi_host/host4/link_power_management_policy

# Make sure ondemand governor is set
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

# Remove the webcam driver
modprobe -r uvcvideo
modprobe -r sbp2
modprobe -r ieee1394
modprobe -r uvcvideo
modprobe -r videodev
modprobe -r v4l1_compat
modprobe -r compat_ioctl32
modprobe -r v4l2_common

The script is commented, I only changed a few things from the original, it works fine, some drivers are able to set the hardware in low-power mode but it seems they don’t do by default, GNU/Linux seems to have to polish laptop distributions.

Powertop shows you the watts you’re currently using when the laptop is not connected to the AC, so I played with phc to undervolt the CPU, now I’m able to use less power for the CPU, this doesn’t decrease the performance.

You can use this tutorial to get a kernel able to undervolt the cpu, you just have to replace a module.

My original settings are:

43 35 27 19

Now they are:

24 1 1 1

Powertop shows the laptop uses less energy now and the cpu is colder at high load.

June 19, 2008

OpenSuse 11 KDE4 already installed

Filed under: computer, linux, Software — Tags: , , — guilleml @ 6:09 pm

The installation has been nice and fast, it even detected my atheros wifi card, this version installs the ath5k madwiki OSS driver, it didn’t work for me, but at least it detected my wifi.
After install I booted another linux, and I mounted the OpenSuse volume under /media/sda3, then:

#cd /media/sda3
#cp /etc/resolv.conf etc
#chroot .
#zypper ref
#zypper in gcc make kernel-source

I downloaded the madwifi source package from and I installed it:

#rpm -i madwifi-0.9.4-1.src.rpm

Then just build it:

#cd /usr/src/packages/SOURCES/madwifi-0.9.4
#make && make install
#rmmod ath5k
#modprobe ath_pci

And that’s it, I selected my wifi network using knetwormonitor and everything worked great.
Now my first impressions:

  • Desktop looks great, beautiful
  • KDE4 works pretty well, as fast as KDE3 in my computer
  • I had to configure my monitor to set it to 75Hz editing /etc/X11/xorg.conf, maybe it’s possible using sax under yast2 but it didn’t work for me, now it’s set to 1280×1024@75Hz and Direct rendering is working fine.
  • I like Konqueror4, it renders webpages pretty fast and seems very stable, no crashes for now.
  • System is updating packages right now, just 2 clicks, I didn’t have to configure repositories.
  • System speaker is working and the pcspkr module is not loaded so I have to guess how to disable that little devil noise when I press tab key.
  • Fonts are great, just as I like them, not like Mandriva…
  • Yeah! package managing it’s lovely now, fast and easy, they’ve solved the thing I didn’t like about OpenSuse.
  • Firefox version is 3 beta 5, a little old, yesterday version 3 came out, I don’t mind because I don’t use it too much, just for posting in the blog because Konqueror doesn’t support the wordpress visual editor.

That’s for now, I’ll post more impressions and conclusions, desktop is really fast.

Downloading OpenSuse 11.0

Filed under: computer, linux, Software — Tags: , , — guilleml @ 3:21 pm

The torrent doesn’t work but the direct download does, you can get it from:

I will install it later, I hope it does better than the RC…will it include the madwifi driver? I don’t think so.

June 5, 2008

My progress with OpenSuse 10.3

Filed under: computer, linux, Software — Tags: , , , — guilleml @ 2:13 pm

Last night I installed OpenSuse 10.3, the install was clean, no problem, really fast.

After that, the first was to install madwifi to enable my atheros wifi card, that was a problem because I couldn’t use repositories, I booted up other linux and I downloaded the kernel source package from the official repository and the madwifi source package from the madwifi site.

Then I installed them in the OpenSuse system:

#rpm -i kernel-source-

#rpm -i madwifi-

The GCC compiler and make tool are needed too, they can be downloaded from the official site as other packages needed.

#rpm -i gcc-4.2-24.i586.rpm

#rpm -i make-3.81-66.i586.rpm

Then just build the madwifi driver:

#cd /usr/src/packages/SOURCES

#tar xvfj madwifi-

#cd madwifi-

#make && make install

#modprobe ath_pci

That should build, install and load the driver, it can be checked with iwconfig tool or dmesg.

Then I used yast2 to configure my network and it worked fine.

I have other little problems I’m not still sure how to solve yet or I’ve solved them already.

  • For example, I have a Pentium IV CPU and p4-clockmod is not loaded at boot so I can’t change the frequency unless I load it:

#modprobe p4-clockmod

  • There is another thing I don’t like, when I’m installing packages or refreshing repositories, the CPU load goes to 100% so the whole system gets a little slow, I’ve never seen that using aptitude.
  • The bootsplash is not loaded at boot, I can see the kernel booting in text mode, I’m sure it’s easy to change, but…then I’ve to do it.
  • I would like to see knetworkmonitor loaded by default in KDE, it is not so yast2 must be used to configure the network.
  • To install amsn I had to add a new repository, the package is not in the official one. After that and intalling it, amsn didn’t load because libtk8.5 and libtcl8.5 links weren’t created in /usr/lib, it was easy to solve:

#ln -s /usr/local/lib/libtk8.5.lib /usr/lib

#ln -s /usr/local/lib/libtcl8.5.lib /usr/lib

  • When I’m browsing Internet with konqueror and move the scrolling bar on the right, it’s slow, the web page moves slow, the desktop seems to work pretty fast and light but konqueror rendering the webs is a little slow, slower than konqueror in Debian or Kubuntu.

I’ll see how can I solve those things.

June 4, 2008

Next Linux distributions I’ll test

Filed under: computer, linux, Software — Tags: , , , , , , — guilleml @ 4:00 pm

I’ve seen a video which shows how the zypper version that comes with OpenSuse 11 will solve the problems I talked about.

Another distro a user recommended me was MEPIS, version 7.0 is based again in Debian 4.0 Etch, I’ve already downloaded the liveCD+install iso so I’ll try tonight.

If I like MEPIS I may install it and I will install OpenSuse when the version 11 comes out, I’m gonna like to have a nice KDE-centered Linux distro.

I’ve used FreeBSD too, but I didn’t like to compile the packages, I know there are binaries but I think they were old…maybe I was wrong, I may try PC-BSD, a FreeBSD distro very easy which uses .pbi packages, something like install packages in Windows, you ust download a file which contais all libraries and binaries needed to work. There is a website with tons of packages where you can download them.

I may try this one, but I’m not sure since the last time I installed FreeBSD, was version 6.0, I had problems with the madwifi wifi driver, the wifi card worked but the computer was so slow it couldn’t be used, with the driver unloaded the system was fast enough.

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