The Nokia N810 with its internal GPS is a device that should fit well for navigation purposes. Below you can see it running navit. In my opinion this is the best available navigation software for the N810. Navit is the main reason for me for wanting the GPS unit in the N810 to be reliable. Get the svn version from here: Gerrit’s Techie Stuff. Some hints on getting navit to run on the N810 can be found on wiki.navit-project.org.

N810 running Navit

Sadly the internal GPS unit of the N810 is known to be very problematic and occasionally hardly gets a fix. The suspect seems to be the gpsdriver. It writes i.e. the almanac data to /var/lib/gps/nvd_data. This file seems to be corrupt sometimes when the gpsdriver writes it. Probably the problem occurs when the GPS unit has no fix. The bug entry on this topic on bugs.maemo.org inspired me to write a small wrapper script for the gpsd that copies a backup to /var/lib/gps/nvd_data and watches the gps-daemon. When the GPS unit has a fix it creates a new backup copy of the nvd_data file for later use. Since I use the script, acquiring a GPS fix never took me more than five minutes anymore (without AGPS, with AGPS it is faster, of course).

If you also want to give my script a try, install bash via program manager and download my script from here: gpsd wrapper script for n810 (1473 downloads )

The most convenient way to get the script to the n810 and to perform the necessary changes is to log into the tablet using ssh. How to get ssh to run on your internet tablet is described here: internettabletblog

Log into your tablet using ssh and rename the original gpsd.

-sh-3.2# mv /usr/sbin/gpsd /usr/sbin/gpsd.orig

Then copy my script to the tablet (replace XXX.XXX.XXX.XXX with the ip of your tablet):

scp gpsd root@XXX.XXX.XXX.XXX:/usr/sbin/

Afterwards fix the permissions of the script on the tablet:

-sh-3.2# chmod a+rx /usr/sbin/gpsd

That’s all, now you should have a much better working GPS unit in your N810. Since I only have one device to test this on, please leave a comment if this also worked for you.

regards

Jürgen

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Posted in drivers, gadgets, linux | 3 Comments »

A while ago during regular upgrades my gentoo box serving as test environment for vservers updated to util-vserver-0.30.216_pre2841. Some weeks later, when I restarted the box I recognized that it could not start any vserver:

# vserver ubuntu start
vcontext: pivot_root(): Invalid argument

An error occured while executing the vserver startup sequence; when
there are no other messages, it is very likely that the init-script
(/etc/init.d/rc 3) failed.

Common causes are:
* /etc/rc.d/rc on Fedora Core 1 and RH9 fails always; the ‘apt-rpm’ build
method knows how to deal with this, but on existing installations,
appending ‘true’ to this file will help.

The box is running vserver-sources kernel 2.6.28-vs2.3.0.36.4-gentoo #2 SMP.

Since I did not find any useful information regarding his error in the web I tried downgrading to util-vserver-0.30.215-r3. For gentoo users this is accomplished by including

>sys-cluster/util-vserver-0.30.215-r3

in /etc/portage/package.mask. Afterwards everything reverted to normality.

If you also experience the “pivot_root(): Invalid argument” error, try downgrading util-vserver and hope for the best 😉

regards

Jürgen

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Posted in gentoo, kernel, linux | 1 Comment »

The java3d ebuilds in the gentoo portage tree are very outdated, and didn’t even work for me anymore. So I wanted to install a newer version of java3d. This resulted in the updated ebuild you can download from here:

sun-java3d-bin-1.5.2.ebuild (927 downloads )

I tried the ebuild together with sun-jdk-1.6.0.13 on x86_64 gentoo linux, but it schould also work on i586.

To use it just create the directory structure

mkdir -p /usr/local/portage/dev-java/sun-java3d-bin/

and copy the new ebuild to that directory. Then run

ebuild /usr/local/portage/dev-java/sun-java3d-bin/sun-java3d-bin-1.5.2.ebuild digest

Be sure to include the following line in your /etc/make.conf:

PORTDIR_OVERLAY=”/usr/local/portage”

Then just emerge sun-java3d.

emerge /usr/local/portage/dev-java/sun-java3d-bin/sun-java3d-bin-1.5.2.ebuild

The ebuild creates some symlinks in your VM’s directory, so if you switch the browser plugin or the entire VM you have to reemerge sun-java3d-bin. To have the library ready to use you also have to add the following lines to your /etc/profile:

if [ “$CLASSPATH” = “” ] ; then
CLASSPATH=”/usr/share/sun-java3d-bin/lib/vecmath.jar:/usr/share/sun-java3d-bin/lib/j3dutils.jar:/usr/share/sun-java3d-bin/lib/j3dcore.jar”
else
CLASSPATH=”${CLASSPATH}:/usr/share/sun-java3d-bin/lib/vecmath.jar:/usr/share/sun-java3d-bin/lib/j3dutils.jar:/usr/share/sun-java3d-bin/lib/j3dcore.jar”
fi
export CLASSPATH

if [ “$LD_LIBRARY_PATH” = “” ] ; then
LD_LIBRARY_PATH=”/usr/lib/sun-java3d-bin/”
else
LD_LIBRARY_PATH=”${LD_LIBRARY_PATH}:/usr/lib/sun-java3d-bin/”
fi
export LD_LIBRARY_PATH

To have the changes in effect logout and login again.

If you want to have java3d useable in firefox you have to modify the line:

export LD_LIBRARY_PATH=”/usr/lib64/mozilla-firefox”

in your /usr/bin/firefox to:

export LD_LIBRARY_PATH=”/usr/lib64/mozilla-firefox”:$LD_LIBRARY_PATH

Otherwise you will end up getting unstatisfied link errors since the j3d library cannot be loaded.

Finally you can test if your java3d works on Testseite für Java und Java3D – VS-C. If you are working in a multiheaded environment, this java3d version may only work on the first display. So, if you experience problems just place your browser on the first head.

Have Fun

Jürgen

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Posted in 3d, gentoo, graphics, linux | 1 Comment »

I just recognized the osgocean release on the osg mailing-list. Osgocean is a library that one can use to render water effects in a very realistic way. It was used to generate the above and below water effects in the VENUS project. For more information on the osgocean project see: osgocean You can see how realistic it looks if you watch the youtube video below.

It looked very interesting, so I decided to try it out. To do so I wrote two ebuilds, one for osgocean and one for  fftss, the fast fourier transformation library it depends on. Both are available in following archive: osgocean overlay (1271 downloads )

Extract the archive to your portage overlay.

# mkdir /usr/local/portage/
# cd /usr/local/portage/
# unzip osgocean_overlay.zip

Be sure that PORTDIR_OVERLAY=”/usr/local/portage” is included in your /etc/make.conf, then you can emerge it:

#emerge osgocean

For this you need to have the OpenSceneGraph library installed. Detailed Instructions on how to build OpenSceneGraph on gentoo can be found on PlopByte.

Since openscenegraph is now in the main portage tree I have updated the ebuild dependencies today (31/08/2009) to either media-gfx/openscenegraph or dev-games/openscenegraph.

Updated ebuild is now available here: osgocean-1.0.1.ebuild (1232 downloads ) Just copy it to /usr/local/portage/media-gfx/osgocean/ after extractingosgocean_overlay.zip like described before and run:

ebuild /usr/local/portage/media-gfx/osgocean/osgocean-1.0.1.ebuild digest

Best regards

Jürgen

(1 votes, average: 5.00 out of 5)

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Posted in 3d, gentoo, graphics, linux, programming, science | No Comments »

As you can read here 2.6.30 is out now. As to the whole set of changes since 2.6.29, the best place to look is probably just
http://kernelnewbies.org/Linux_2_6_30
as usual. One thing that doesn’t seem to be mentioned here is that we’re hopefully now done with the suspend/resume irq re-architecting, and have switched to a new world order. Although I suspect lots of details will still change, of course.

If we have tested the new kernel, probably with zen patch set, we will tell you

best regards xexplorer

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Posted in kernel, linux, zen-sources | No Comments »

After I have tested the nvidia-drivers-185.18.08 beta I searched the web for a new one and I found it yesterday on nvnews.net. This version seems to run well on my Dell M4300. For all using Gentoo I  made an ebuild: ebuild:nvidia-drivers (1105 downloads )

# mkdir /usr/local/portage/
# cd /usr/local/portage/
# tar -xpvf nv-portage.tar

Be sure that PORTDIR_OVERLAY=”/usr/local/portage” is in your /etc/make.conf, then you can emerge it:
# ACCEPT_KEYWORDS=”~amd64″ emerge =nvidia-drivers-180.60 -1

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Posted in drivers, gentoo, graphics, linux | 2 Comments »

Because of the problem with a good, fast and working nvidia driver, I’ve tested the actual beta driver from Nvidia. After installing it on my system (Dell M4300, with zen-sources 2.6.29-r3 running fine on it) everything seems to be fine. But there was the first fault. The character set in the Terminal swaps. The next serious error was restarting the X-Server or crashing the whole system while surfing with Epiphany. So I downgraded my system to nvidia-drivers-180.29 again as mentioned here. It seems Nvidia has to do some work on it, still we have another working release. Stay tuned, we will test it and tell you our experience with any new driver we found from Nvidia.

LG Thorsten

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Posted in 3d, drivers, linux | No Comments »