Problems with Bluetooth Headset with Linux/Debian

April 28, 2020

I was wrestling for some time to get my Bluetooth Headset to work with my notebook (lenovo thinkpad t460) with debian testing. My problem was, that only the speaker (audio-out) was working, but the microphone of the headset was not identified by the system.

The solution was really easy (after finding out what to do): You have to change the audio profile of the headset to “Headset Head Unit (HSP/HFP)”. I did this with the pavucontrol command of pulseaudio.

Mini book review: Foundation Trilogy

December 17, 2018

The foundation trilogy was written by Isaac Asimov around 1950. It consists of the three books called Foundation, Foundation and Empire and Second Foundation. There are also a bunch of other books related to this narrative which as a whole are called Foundation Series.

The trilogy – it has to be said – is not a milestone in feminist science fiction. Even thousands of years in the future, women are responsible for cooking and war is for men. But that and some repetitions in the three books aside, the (short) trilogy consists of a unique story line which I rather enjoyed.

3 out of 5 manly psychologists

Spring into kotlin: A short video presentation

December 15, 2018

If you heard about kotlin and have some knowledge about the spring framework you might enjoy this 30 min video presentation on

Mark Heckler discusses how Kotlin can be used to reduce boilerplate and increase code quality, showing how to begin incorporating Kotlin into an existing Spring application.

Springing into Kotlin: How to Make the Magic Even More Magical

Mini book review: Babel-17

December 9, 2018

The book Babel-17 won the Nebula Award for Best Novel in 1967. It is written by Samuel R. Delany. Not surprisingly this book falls into the category Science Fiction. I have to admit it was to “artsy” for me. The idea of the story and the setting is compelling, but the way it was written was not liking. If you are a language nerd, this might be a book you could enjoy.

2 out 5 over the top sceneries

Mini book review: Flowers for Algernon

December 2, 2018

Some days ago I finished the book Flowers for Algernon written by Daniel Keyes in the year 1966. If you are open to non conventional ways of telling a story and you don’t shy away from emotional topics, then this may be a book for you. I can wholeheartedly recommend this book for science fictions readers!

Flowers For Algernon

4 out of 5 misplaced punctuations

Hilarious keynote about being sceptic about machine learning and internet of things…

September 11, 2018

Some people enter the technology industry to build newer, more exciting kinds of technology as quickly as possible. My keynote will savage these people and will burn important professional bridges, likely forcing me to join a monastery or another penance-focused organization. In my keynote, I will explain why the proliferation of ubiquitous technology is good in the same sense that ubiquitous Venus weather would be good, i.e., not good at all. Using case studies involving machine learning and other hastily-executed figments of Silicon Valley’s imagination, I will explain why computer security (and larger notions of ethical computing) are difficult to achieve if developers insist on literally not questioning anything that they do since even brief introspection would reduce the frequency of git commits. At some point, my microphone will be cut off, possibly by hotel management, but possibly by myself, because microphones are technology and we need to reclaim the stark purity that emerges from amplifying our voices using rams’ horns and sheets of papyrus rolled into cone shapes. I will explain why papyrus cones are not vulnerable to buffer overflow attacks, and then I will conclude by observing that my new start-up is looking for talented full-stack developers who are comfortable executing computational tasks on an abacus or several nearby sticks. [more]

Overall the video is really enjoyable and you should watch it if you want to know why you should be critical about machine learning, internet of things and so on. One thing i would criticize is his conclusion that dumbness, laziness or technology fanatism is the reason of all this bad things happening in the technology sector. How is this society organized? Who provides services or creates products? Companies do. But what are their ultimate goals? What need they do to stay alive? Of course: Making more money out of money. This is the drive that leads to missing security, questionable ethics in software development and a lot of other stuff. This is something James Mickens misses and is not talking about: Money.

[efail] Enigmail 2.0 and Debian testing

June 7, 2018

If you are someone like me – meaning you use thunderbird/enigmail on debian testing – you might be interested when enigmail 2.x is coming into the testing repositories. You know, because of efail.

There is one reddit discussion about the status of enigmail 2.0 in debian stable/stretch. But what about us testing users? There is the debian package tracker website where you can get more details on which package is on the way into stable/testing/experimental. The page for enigmail shows that enigmail 2.0.6-1 is on its way, but I have no experience how long it will take to trickle into debian testing.

Maybe some of you out there have any experience? How long does it take?

Why should I care about Progressive Web Apps?

February 25, 2018

If you are interested in web development you may have heard the term Progressive Web Apps. If you are not sure what the hype is all about or you know some things but want to get an easy transition into how to use some them, then I recommend you the presentation called Up and Running with Progressive Web Apps. You will learn how the install, push notifications and offline functionality looks like and works.

Usefull resources/links presented in the presentation:

Kodi and problems when media source address changes

August 10, 2017

Maybe you have experienced something like that too. You have a network attached storage and  you connect it (for example via nfs) to your kodi system running on another machine (e.g. on a raspberry pi). You change something in your network configuration and – bam – nothing works. This could happen, because kodi gets it media data via a network address composed of IP addresses instead of a host name. If this happens to you – and it happened to me several times – this sucks. The first times I just created a new media source with the new IP address and imported all the media again. But wouldn’t i be nicer to just migrate the existing entries in kodi to their new location? This can be done relatively easy.

First: Use the /etc/hosts to define a hostname for the ip address of your NAS. Why? Because if there are new changes in your network configuration, you only need one change and everything is working again. Hint: If you are using librelec (like me), you need to set the hosts configuration in /storage/.config/hosts.conf .

Second: This doesn’t help you in the first place, if all your media entries are still linked to the old location. But there is a solution too: Kodi uses sqllite databases to manage its state. So you can use a sqllitebrowser like to change the wrong location of the media entries. Just follow the howto on the kodi wiki!

After this: Enjoy!

Can I use this feature in a given web browser in a given version?

June 22, 2017

If you are developing for the web you certainly were confronted by the question if a given web feature (webrtcURLSearchParams, …) is supported by browsers and which versions of them. To answer this question you can use the website