Tag: Linux

Controlling Dell Laptop Keyboard Backlight in Linux

- by mahmood

Show the configured brightness

cat /sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/brightness
0

See the maximum brightness

cat /sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/max_brightness
4

Set the desired level of brightness

$ echo 4 | sudo tee /sys/devices/platform/dell-laptop/leds/dell\:\:kbd_backlight/brightness

References
https://askubuntu.com/questions/1076393/dell-keyboard-backlight-is-not-working
https://www.unixtutorial.org/controlling-dell-laptop-keyboard-backlight-from-command-line/

Create a Samba share on Fedora

- by mahmood 
sudo dnf install samba
sudo systemctl enable smb --now
firewall-cmd --get-active-zones
sudo firewall-cmd --permanent --zone=FedoraWorkstation --add-service=samba
sudo firewall-cmd --reload

Samba does not use the operating system users for authentication, so your user account must be duplicated in Samba. So if your account is jane on the host, the user jane must also be added to Samba. While the usernames must match, the passwords can be different.

sudo smbpasswd -a jane

mkdir /home/jane/share
sudo semanage fcontext --add --type "samba_share_t" ~/share
sudo restorecon -R ~/share
sudo nano /etc/samba/smb.conf
[share]
        comment = My Share
        path = /home/jane/share
        writeable = yes
        browseable = yes
        public = yes
        create mask = 0644
        directory mask = 0755
        write list = user
sudo systemctl restart smb

Disable SELinux if required

sudo nano /etc/selinux/config

SELINUX=disabled

sudo reboot

References
https://docs.fedoraproject.org/en-US/quick-docs/samba/
https://www.cyberciti.biz/faq/disable-selinux-on-centos-7-rhel-7-fedora-linux/

Trust the ASP.NET Core HTTPS development certificate on Fedora

- by mahmood 
sudo dnf install nss-tools

Setup Firefox

echo 'pref("general.config.filename", "firefox.cfg");
pref("general.config.obscure_value", 0);' > ./autoconfig.js

echo '//Enable policies.json
lockPref("browser.policies.perUserDir", false);' > firefox.cfg

echo "{
    \"policies\": {
        \"Certificates\": {
            \"Install\": [
            	\"aspnetcore-localhost-https.crt\"
            ]
        }
    }
}" > policies.json

dotnet dev-certs https -ep localhost.crt --format PEM

sudo mv autoconfig.js /usr/lib64/firefox/
sudo mv firefox.cfg /usr/lib64/firefox/
sudo mv policies.json /usr/lib64/firefox/distribution/
mkdir -p ~/.mozilla/certificates
cp localhost.crt ~/.mozilla/certificates/aspnetcore-localhost-https.crt

Trust Edge/Chrome

certutil -d sql:$HOME/.pki/nssdb -A -t "P,," -n localhost -i ./localhost.crt
certutil -d sql:$HOME/.pki/nssdb -A -t "C,," -n localhost -i ./localhost.crt

Trust dotnet-to-dotnet

sudo cp localhost.crt /etc/pki/tls/certs/aspnetcore-localhost-https.pem
sudo update-ca-trust

Cleanup

rm localhost.crt

References
https://docs.microsoft.com/en-us/aspnet/core/security/enforcing-ssl?view=aspnetcore-6.0&tabs=visual-studio#trust-https-certificate-on-linux
https://github.com/dotnet/aspnetcore/issues/32842
https://github.com/dotnet/aspnetcore/issues/32361

Install Redis on Ubuntu 20.04

- by mahmood 
sudo apt install redis-server

Configure Redis

sudo nano /etc/redis/redis.conf

find the line specifying the supervised directive. By default, this line is set to no. However, to manage Redis as a service, set the supervised directive to systemd (Ubuntu’s init system).

Secure Redis

sudo nano /etc/redis/redis.conf

locate the requirepass directive under the SECURITY section and uncomment it (by removing #).Once you have uncommented the line, replace foobared with the password of your choice.

sudo systemctl restart redis.service

References
https://phoenixnap.com/kb/install-redis-on-ubuntu-20-04

Install NVIDIA 340.108 Driver on Ubuntu

- by mahmood

Install NVIDIA proprietary drivers on Debian / Ubuntu / Linux Mint / LMDE and disable the nouveau driver

Make sure that you system is up-to-date and you are running latest kernel, also make sure that you don’t have any Debian / Ubuntu / Linux Mint / LMDE NVIDIA package installed

## Ubuntu / Debian / Linux Mint / LMDE ##
apt update

apt upgrade

## Debian and Linux Mint ##
apt autoremove $(dpkg -l nvidia-driver* |grep ii |awk '{print $2}')

## Ubuntu ##
apt autoremove $(dpkg -l xserver-xorg-video-nvidia* |grep ii |awk '{print $2}')

apt reinstall xserver-xorg-video-nouveau

Install needed dependencies

## Ubuntu / Debian / Linux Mint ##
apt install linux-headers-$(uname -r) gcc make acpid dkms libglvnd-core-dev libglvnd0 libglvnd-dev dracut wget patch libgtk2.0-0

Disable nouveau

Create or edit /etc/modprobe.d/blacklist.conf

Append ‘blacklist nouveau’

echo "blacklist nouveau" >> /etc/modprobe.d/blacklist.conf

Edit /etc/default/grub

Append ‘rd.driver.blacklist=nouveau’ to end of ‘GRUB_CMDLINE_LINUX=”…”‘.

## Example row on Debian ##
GRUB_CMDLINE_LINUX_DEFAULT="quiet rd.driver.blacklist=nouveau"

## OR with Ubuntu and Linux Mint ##
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash rd.driver.blacklist=nouveau"

Update grub2 conf

## BIOS and UEFI ##
update-grub2

Generate initramfs

## Backup old initramfs nouveau image ##
mv /boot/initrd.img-$(uname -r) /boot/initrd.img-$(uname -r)-nouveau
 
## Generate new initramfs image ##
dracut -q /boot/initrd.img-$(uname -r) $(uname -r)

Create new directory for inttf NVIDIA patcher

cd ~
mkdir NVIDIA
cd NVIDIA

Download / Update inttf NVIDIA patcher

wget -O inttf-nvidia-patcher.sh https://nvidia.if-not-true-then-false.com/patcher/inttf-nvidia-patcher.sh

Make inttf NVIDIA patcher executable

chmod +x inttf-nvidia-patcher.sh

Download and patch your drivers

./inttf-nvidia-patcher.sh -v 340.108

Reboot to runlevel 3

systemctl set-default multi-user.target

reboot

Run NVIDIA Binary

./NVIDIA-Linux-x86_64-340.108-patched-kernel-5.15.run
systemctl set-default graphical.target

reboot

References
https://www.if-not-true-then-false.com/2021/debian-ubuntu-linux-mint-nvidia-guide/
https://www.if-not-true-then-false.com/2020/inttf-nvidia-patcher/