foss-north – the count down

Every year we try to seed the foss-north event with a set of key speakers. This year, one of our seed speakers is Patricia Aas from the Vivaldi Browser. She will be speaking about isolating GPU access in its own process.

“Chromium’s process architecture has graphics access restricted to a separate GPU-process. There are several reasons why this could make sense, three common ones are: Security, Robustness and Dependency Separation.

GPU access restricted to a single process requires an efficient framework for communication over IPC from the other processes, and most likely a framework for composition of surfaces. This talk describes both the possible motivations for this kind of architecture and Chromium’s solution for the IPC framework. We will demonstrate how a multiprocess program can compose into a single window on Linux.”

It is just 5 more days left of the Call for Papers. With the help of our great sponsors we have the opportunity to transport you to our conference if you are selected to speak. Make sure to make your submission before March 11 and you are in the race.

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foss-north – the count down

Every year we try to seed the foss-north event with a set of key speakers. This year, one of our seed speakers is Carsten Munk known from Jolla, libhybris, Meego, Maemo and more. This year he will speak about his new endevour Zipper – bringing blockchain technology to mobile devices.

“Zipper is an Ethereum based mobile platform which brings blockchain based services to our smartphones in one seamless and user-controlled experience.

At first, Zipper provides everyday smartphone users an easy and safe way to manage their identity and private keys. This makes it possible for anyone to access blockchain based services out-of-the-box in an easy and intuitive way – just like Apple’s services on iOS today – while being in full control of their identity, transactions and data. Zipper works in an isolated compartment in Android and Sailfish OS smartphones, making Zipper and its wallet secure while still easily accessible.”

It is just 6 more days left of the Call for Papers. With the help of our great sponsors we have the opportunity to transport you to our conference if you are selected to speak. Make sure to make your submission before March 11 and you are in the race.

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foss-north – the count down

Flashback time! At last year’s foss-north we had a great talk by Chris Lamb about reproducible builds. You can see the recording right here (you might have to click the link if your aggregator hides YouTube contents)

foss-north strives to gather the best speakers, the best audience at the best location (Gothenburg) for one day each year. This year the event takes place on April 23 – get your tickets here!

It is just 7 more days left of the Call for Papers. With the help of our great sponsors we have the opportunity to transport you to our conference if you are selected to speak. Make sure to make your submission before March 11 and you are in the race.

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foss-north – the count down

Flashback time! At last year’s foss-north we had a great talk by Alexander Larsson introducing flatpak. You can see the recording right here (you might have to click the link if your aggregator hides YouTube contents)

foss-north strives to gather the best speakers, the best audience at the best location (Gothenburg) for one day each year. This year the event takes place on April 23 – get your tickets here!

It is just 8 more days left of the Call for Papers. With the help of our great sponsors we have the opportunity to transport you to our conference if you are selected to speak. Make sure to make your submission before March 11 and you are in the race.

Posted in foss-gbg, foss-north, Miscellaneous | Comments closed

foss-north – the count down

At this year’s foss-north event FSFE will revive the Nordic Free Software Award and the conference will host the prize ceremony. Get your tickets for a great opportunity to meet with the FOSS community, learn new things and visit Gothenburg.

It is just 9 more days left of the Call for Papers. With the help of our great sponsors we have the opportunity to transport you to our conference if you are selected to speak. Make sure to make your submission before March 11 and you are in the race.

Posted in foss-gbg, foss-north, KDE, Miscellaneous, Qt | Comments closed

foss-north – the count down

We are approaching the count down to foss-north 2018 – at least from an organizer perspective. This year we will be at Chalmers Conference Centre, in the centre of Gothenburg – the world’s most sociable, friendliest city. So, save the date – April 23 – and make sure to drop by.

The reason why it feels like the count down has started is that it is just 10 more days left of the Call for Papers. With the help of our great sponsors we have the opportunity to transport you to our conference if you are selected to speak. Make sure to make your submission before March 11 and you are in the race.

When moving to Chalmers we ended up with a larger venue than last year so make sure to get your ticket – and bring your friends. The saying “the more the merrier” definitely applies to FOSS conferences!

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Linux and Qt in Automotive? Let’s meet up!

For anyone around the Gothenburg area on Feb 1st, you are most welcome to the Automotive MeetUp held at the Pelagicore and Luxoft offices. There will be talks about Qt/QML, our embedded Linux platform PELUX and some ramblings about open source in automotive by yours truly ;-)

If you want to come, please register here.

Posted in Embedded, Linux, Qt, Yocto | Comments closed

Berlin for a month

A month ago my family and I left our home to go to a new country and city for a month. As an experiment. As a source of variation. As something new. As an adventure.

The background to going to Berlin is that we’re starting a new office in Berlin and people need to be onboarded (we are also looking for people in Gothenburg). This requires someone on the ground. At the same time, we, as a family, have been playing with the idea to relocated for a longer or shorter period and the timing of this opportunity was nice, as the length of the trip was short enough to be manageable.

The move led to a lot of changes. We went from a city of 40000 inhabitants to Berlin with around four million. We moved from a house of 200 square meters to a two room apartment of around 50 square meters. We also moved from two working adults with kids attending school, to four weeks of home schooling and one parent taking care of the home.

From a work perspective, it has been fun to get to know a group of new colleagues from all over the world. From that perspective, Berlin is very un-german. Everyone seems happy to speak English and you always encounter people from various background. Still, I got some proper german practice, so I now master explaining that my german is bad :-)

From a family perspective, things have been better than I ever expected. The benefit of a big city is that there are a million things to do. The feeling is more that we are running out of time, rather than that we want to go back home again. Also, the sheer selection of playgrounds in Berlin is really great. We have three good playgrounds within 2-3 blocks from our apartment, so plenty of variation.

Another family related issue is the ease of commuting. I went from a 45 minutes train ride to a 3-4 minutes walk, which gives me a lot more time to spend with my family. At the same time, it does take away 90 minutes everyday of concentrated mail management, which means that my inbox currently is in a very sad state.

Another aspect in the same direction is that we spend a lot more time together as a family, partly since the kids don’t run off to their friends right after school. This also means that I get a lot less free time for taking care of hobbies such as foss-north and foss-gbg.

As you can tell, most aspects of this temporary change are double-edged. If I were to move anywhere permanently, some of this would have to be resolved. At the same time, I got a month of working in Germany combined with way more time with my kids and wife than I usually get, so I would not want to change anything. I think that this picture really sums things up. Berlin is a city of contrasts and compared to my life in Sweden, the way I lived in Berlin had a strong contrast as well.

Posted in foss-gbg, foss-north, Meta | Comments closed

Building Qt on Debian

I recently followed the advice of @sehurlburt to offer help to other developers. As I work with Qt and embedded Linux on a daily basis, I offered to help. (You should do the same!)

As it is easy to run out of words on Twitter, so here comes a slightly more lengthy explanation on how I build the latest and greatest of Qt for my Debian machine. Notice that there are easier ways to get Qt – you can install it from packages, or use the installer provided from The Qt Company. But if you want to build it yourself for whatever reason, this is how I do it.

First step is to get the build dependencies to your system. This might feel tricky, but apt-get can help you here. To get the dependencies for Qt 5, simply run sudo apt-get build-dep libqt5core5a and you are set.

Next step would be to get the Qt source tarball. You get it by going to https://www.qt.io/download/, select the open source version (unless you hold a commercial license) and then click the tiny View All Downloads link under the large Your download section. There you can find source packages for both Qt and Qt Creator.

Having downloaded and extracted the Qt tarball, enter the directory and configure the build. I usually do something like
./configure -prefix /home/e8johan/work/qt/5.9.0/inst -nomake examples -nomake tests. That should build everything, but skip examples and tests (you can build these later if you want to). The prefix should point to someplace in your home directory. The prefix has had some peculiar behaviour earlier, so I try to make sure not to have a final dash after the path. When the configuration has been run, you can look at the config.summary file (or the a bit higher up in the console output) and you can see a nice summary of what you are about to build. If this list looks odd, you need to look into the dependencies manually. Once you are happy, simply run make. If you want to speed things up, use the -j option with the highest number you dare (usually number of CPU cores plus one). This will parallelize the build.

Once the build is done (this takes a lot of time, expect at least 45 minutes with a decent machine), you need to install Qt. Run make install to do so. As you install Qt to someplace in your home directory, you do not need to use sudo.

The entry point to all of Qt is the qmake tool produced by your build (i.e. prefix/bin/qmake). If you run qmake -query you can see that it knows its version and installation point. This is why you cannot move a Qt installation around to random locations without hacking qmake. I tend to create a link (using ln -s) to this binary to somewhere in my path so that I can run qmake-5.9.0 or qmake-5.6.1 or whatnot to invoke a specific qmake version (caveat: when changing Qt version in a build tree, run qmake-version -recursive from the project root to change all Makefiles to the correct Qt version, otherwise you will get very “interesting” results).

Armed with this knowledge, we can go ahead and build QtCreator. It should be a matter of extracting the tarball, running the appropriate qmake in the root of the extracted code followed by make. QtCreator does not have to be installed, instead, just create a link to the qtcreator binary in the bin/ sub directory.

Running QtCreator, you can add Qt builds under Tools -> Options… -> Build & Run. Here, add a version by pointing at its qmake file, e.g. the qmake-5.9.0 link you just created. Then it is just a matter of picking Qt version for your project and build away.

Disclaimer! This is how I do things, but it might not be the recommended or even the right way to do it.

Posted in KDE, KDE 4, Linux, Qt | Comments closed

foss-gbg gets going again

It is time for foss-gbg to get going again. A week from now Zeeshan will talk about The good kind of Rust. Tickets are free, so if you are in Gothenburg, feel free to drop by for some snacks, the Rust talk and some lighting talks.

foss-gbg is a local group sharing ideas and knowledge around Free and Open Source Software in the Gothenburg area.

Posted in foss-gbg | Comments closed
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