Monthly Archives: January 2018

Google Hash Code 2018 Limassol Cyprus – Call for participation 1

 in 2018 / Google / Hash Code  tagged 2018 / code / cyprus / google / hash / hash code by

We’ll be hosting a hub at the Cyprus University of Technology for the Online Qualification Round of Hash Code, a team-based programming competition created by Google for university students and industry professionals. The Online Qualification Round takes place on the 1st of March at 19:30 EET and registered teams from Cyprus are invited to participate from our hub, which will be at the Labs of the University. Top scoring teams from the Online Qualification Round will then be invited to Google’s Paris office to compete in the Final Round of the competition on the 1st of April.

If you’re interested in joining our hub, find a team (two to four people) and register at g.co/hashcode. Make sure to select Cyprus University of Technology from the list of hubs in the Judge System.

For more information about this and other hubs in Cyprus (including the twin event in Nicosia) visit https://goo.gl/uuRspx

Hash Code 2018 Limassol Cyprus – Facebook Event

Thanks!

Address:

Cyprus University of Technology
Room: ΚΧΕ 1 - Computer Lab
Polyxeni Loizia and Eleni Autonomou Building (Old Cadastre)
Athinon Street
Limassol

Τεχνολογικό Πανεπιστήμιο Κύπρου
Δωμάτιο: ΚΧΕ 1 -  Εργαστήριο Ηλεκτρονικών Υπολογιστών
Κτήριο Πολυξένη Λοϊζία και Ελένη Αυτονόμου (Παλιό Κτηματολόγιο)
Οδός Αθηνών
Λεμεσός

Date and Time:

1st March 2018
From: 19:30 EET
To: 23:30 EET

Free Amenities Offered

High speed Internet access
Wi-Fi access to the Internet for your mobile devices (personal computers and smart phones)
Lab computers will be available for use by the participants
Food in the form of snacks and beverages will be available outside the labs

Google Hash Code 2018 – Online Qualification Round Schedule

18:30 EET:

  • The hub will open to the public
  • People can view the live stream on the video projector
  • Teams can set themselves up with the help of the volunteers

19:30 EET:

  • Live stream starts

19:45 EET:

  • Task will be made available, competition starts
  • Scoreboard will be displayed on the video projector
  • Participating teams will be confirmed in the Judge System

23:30 EET:

  • End of the competition
  • Announcement of the score for the local teams

00:00 EET:

  • The hub will close

How we accidentally fixed the black screen issue of OBS studio on Fedora 27 x64 3

 in GNU/Linux  tagged black screen / cuda / fedora / fix / GeForce GTX 660M / nvidia / obs / obs-studio / rpmfusion / Screen Capture (XSHM) / Window Capture (XComposite) by

As mentioned in a previous post, we installed OBS studio on our machine in order to make some desktop recordings.
What that post did not mention are two issues that we had:

  1. when recording using the Screen Capture (XSHM) source, the recording would only show a black screen and it would actually record the mouse only!
  2. when trying to record a LibreOffice application like Calc through the Window Capture (XComposite) source, Calc would not show in the properties dialog under the Window dropdown menu

The way we fixed these issues is not something that is always guaranteed to work but it is worth a try!
Initially we thought it would be a good idea to install the NVidia driver since we had a GeForce GTX 660M on the machine.
We hoped that the OBS studio black screen issue was a driver issue so we decided to follow the RPM Fusion guide on installing NVidia drivers.

We installed the NVidia driver, added the CUDA support and updated the system using these two commands:


dnf install xorg-x11-drv-nvidia akmod-nvidia xorg-x11-drv-nvidia-cuda;
dnf update -y;

and then we did a full reboot of the machine.

After the machine booted and the graphical interface came up, we noticed that the machine was too slow and there was 100% CPU utilization for over 15 minutes.
After some very efficient Google-Fu, we realised that this was some bug that we were not willing to deal with and so we had to remove the newly installed NVidia driver.
Again following the RPM Fusion guide, we executed the following command to remove the driver from our system:


dnf remove xorg-x11-drv-nvidia\*

Please note that we DID NOT execute the last step of the guide on how to Recover from NVIDIA installer.
As it is mentioned in the guide: the NVidia binary driver installer overwrites some configuration and libraries.
Since having a clean state did not work for us, we decided to give a go of this hybrid setup that we had.
Following another full restart we were able to see that OBS Studio was working as expected and it the black screen issue was no more!!
Also, we could choose LibreOffice from the Window dropdown and we could record that as well!

As implied, this guide is a hack, it could work for you as well or not.
Our opinion is that, it is worth to give it a go!
As a synopsis, what we did was to install the NVidia driver and uninstall it, the libraries that got overwritten by this process fixed the black screen issue of OBS studio.

Bonus: to find the model of your graphics card, execute the following


lspci |grep -E "VGA|3D";

In our machine we got the following output: 01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GTX 660M] (rev a1)