Flickr Photos

Young Red Fox
Red Fox eating rowan berries
Roe Deer
Leopard in the rain
Lion mum taking care of cubs
Male Lion
Lion Cubs Playing
Leopard
Lazy Spotted Hyena
Female Lion
Cheetah
Golden Jackal

photography

If you are here for my photographs visit: http://photography.petrilopia.net/

Or follow me on Instagram or Flickr.

How to get Joy-IT 7″ Display work with Raspberry Pi

How to get Joy-IT 7″ Display work with raspberry pi

JoyIT 7″ Display:

Resolution 1024×600
Touch Controller GT811
Connectors HDMI for video and USB for power and touch functions

This shows you how to get JoyIt external 7″ HDMI display to work with Raspberry Pi. After these things image is OK and even touch screen thingy is working :-)

If you connect your joyit 7 inch display to your Raspberry Pi right away without any modifications it will probably look like this:

Raspberry Pi JoyIT Display Before

First I thought that my display is broken but then I tested it with my laptop and it worked so problem has to be somewhere else. I started to think about resolution settings of my Rasberry Pi and that indeed was the problem so here is how to fix it.

Model Joy-IT RB-LCD7-2 or JoyIT RB-LCD-7-2 or something like that

Continue reading How to get Joy-IT 7″ Display work with Raspberry Pi

Oracle VM VirtualBox: Oracle VM VT-x/AMD-V hardware acceleration is not available on your system

I have Dell XPS 13 9350 laptop and I needed to install few virtual machine to it using
Oracle VirtualBox software but when I tried to install example Windows 10 or Kali Linux I alwas got error message
which said:

“VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Your 64-bit guest will fail
to detect a 64-bit CPU and will not be able to boot.

Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer.”

VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot. Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer.

VirtualBox VT-x/AMD-V hardware acceleration error

To fix this you have to boot your laptop and go to bios and remove check mark from “Enable CPU XD Support”:

Continue reading Oracle VM VirtualBox: Oracle VM VT-x/AMD-V hardware acceleration is not available on your system

Linux: Adjust LCD laptop backlight brightness from command line

I needed to find out how can I change my laptop backlight brighness using just a command line. Solution for that problem was easier than I thought because you can do
that just with one line =)

On my laptop which is Dell Latitude D430 brigness file was on /sys/class/backlight/dell_backlight directory but it’s probably almost on the same place /sys/class/backlight/ on every laptop (and linux distribution) which is it possible to change.

Before you start to change your laptop display brightness you should find out which is the maximum brigness of your screen which you can see with cat command from the max_brigtness file like this:

cat /sys/class/backlight/dell_backlight/max_brightness

On my laptop max brightness was 7 and surprisingly lowest brightness is 0 so let’s change brightness between 0-7 =)

So if I want to save energy and turn backlight as dark as possible I just put 0 to brightness file like this:

echo 0 > /sys/class/backlight/dell_backlight/brightness

Continue reading Linux: Adjust LCD laptop backlight brightness from command line