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I have Dell XPS 13 9350 laptop and I needed to install few virtual machine to it using “VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Your 64-bit guest will fail 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”: 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 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 If you get this “IP Traffic Monitor already listening on eth0” error when you are trying to use iptraf:  IP Traffic Monitor already listening on eth0 Or any other interface like eth1 or wlan0 and so on… Be sure that you don’t have any iptraf applications running: ps ax|grep iptraf and after that you should only see line with “grep iptraf” but no iptraf applications. After that remove all files from /var/run/iptraf/ and after that start iptraf root@NSA:/# cd /var/run/iptraf/ root@NSA:/var/run/iptraf# rm * root@NSA:/var/run/iptraf# Continue reading IP Traffic Monitor already listening on eth0 |
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February 5th, 2015 | 
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