Make sure your current system is up to date:
sudo dnf upgrade --refresh
Reboot:
reboot
Install dnf plugin which updates OS:
sudo dnf install dnf-plugin-system-upgrade
Download and prepare packages for upgrade:
sudo dnf system-upgrade download --releasever=40
Reboot and start upgrade process
sudo dnf system-upgrade reboot
Logitech MX Mechanical Mini keyboard works mostly great in Linux. However, there are few buttons which don’t: Mic mute, Screenshots, Emoji, Voice dictation. To fix it, install solaar and reboot your computer (important, otherwise the app will hang):
sudo dnf install solaar
reboot
Configuring every button is 2-step process.
On the first step, the button is marked as a custom button (Diverted):
On the second step, click Rule Editor in the bottom left corner and there you
can assign a new action to it:
Solaar keeps configuration files in ~/.config/solaar/ directory. Rules are stored
in ~/config/solaar/rules.yaml file:
%YAML 1.3
---
- Key: [MultiPlatform Search, pressed]
- KeyPress:
- XF86_AudioNext
- click
...
---
- Key: [Voice Dictation, pressed]
- Execute: [firefox, 'https://gemini.google.com']
...
---
- Key: [Snipping Tool, pressed]
- KeyPress:
- Print
- click
...
---
- Key: [Open Emoji Panel, pressed]
- Execute: gnome-characters
...
---
- Key: [Mute Microphone, pressed]
- KeyPress:
- XF86_AudioMicMute
- click
...
The configuration file is located in ~/.config/solaar/config.yaml and is unique
for every keyboard. It contains the keyboard’s name, serial number and etc. Our
modified configuration should look like this:
- 1.1.10
- _NAME: MX Mechanical Mini
_absent: [hi-res-scroll, lowres-scroll-mode, hires-smooth-invert, hires-smooth-resolution, hires-scroll-mode, scroll-ratchet, smart-shift, thumb-scroll-invert,
thumb-scroll-mode, onboard_profiles, report_rate, pointer_speed, dpi, speed-change, backlight-timed, reprogrammable-keys, persistent-remappable-keys,
crown-smooth, divert-crown, divert-gkeys, m-key-leds, mr-key-led, gesture2-gestures, gesture2-divert, gesture2-params, sidetone, equalizer, adc_power_management]
# <redacted>
_sensitive: {divert-keys: true, multiplatform: false}
# <redacted>
backlight: true
change-host: null
disable-keyboard-keys: {1: false, 4: false, 8: false, 16: false}
divert-keys: {212: 1, 226: 0, 227: 0, 231: 0, 232: 0, 233: 0, 259: 1, 264: 1, 266: 1, 267: 0, 268: 0, 269: 0, 270: 0, 271: 0, 272: 0, 273: 0, 274: 0,
277: 0, 279: 0, 280: 0, 281: 0, 282: 0, 283: 0, 284: 1, 286: 0, 316: 0, 321: 0}
fn-swap: false
multiplatform: 0
This command will plot open connections:
{ while true; do ss -ant | grep ESTAB | wc -l; sleep 0.1; done } | ttyplot
dnf repoquery --deplist <package-name>
sudo dnf install ffmpeg v4l2loopback akmod-v4l2loopback
lsmod | grep v4l2loopback
akmods --kernels $(uname -r) --rebuild
# Confirm that it was loaded
ffmpeg -i http://192.168.2.26:8080/videofeed -vf format=yuv420p -f v4l2 /dev/video0
If for some reason
v4l2loopbackmodule is not compiled correctly, you can try to compile it manually by following this instruction
(sourceCategory=prod/* ss-haproxy)
| parse "{|||}" as host,forwarded, referer, ua
| where forwarded matches ","
dnf update -y
reboot
dnf module disable python36 virt
dnf install https://mirror.stream.centos.org/9-stream/BaseOS/x86_64/os/Packages/centos-stream-release-9.0-22.el9.noarch.rpm https://mirror.stream.centos.org/9-stream/BaseOS/x86_64/os/Packages/centos-gpg-keys-9.0-22.el9.noarch.rpm https://mirror.stream.centos.org/9-stream/BaseOS/x86_64/os/Packages/centos-stream-repos-9.0-22.el9.noarch.rpm
dnf --releasever=9 --allowerasing --setopt=deltarpm=false distro-sync -y
rpm --rebuilddb
Disable subscription manager. Open file /etc/yum/pluginconf.d/subscription-manager.conf and set enabled to 0
Reboot and verify
cat /etc/redhat-release
uname -a
# List all boot options
grubby --info=ALL
# Reflect the desired kernel in configuration
grubby --set-default vmlinuz-<version>.<arch>
# Make sure the index is also set in `/etc/default/grub` file
# Regenerate boot configuration
grub2-mkconfig -o /boot/grub2/grub.cfg
reboot
# Remove old kernels...
The instructions are inspired by CentOS 8 to CentOS Stream 8 migration guide and Fedora upgrade procedure
sudo dnf copr enable meeuw/droidcam
sudo dnf install droidcam
If droidcam doesn’t start with the following error:
$ droidcam
Fatal: droidcam video device reported pixel format 34524742 (BGR4), expected 32315559 (YU12/I420)
Try 'v4l2loopback-ctl set-caps "video/x-raw, format=I420, width=640, height=480" /dev/video<N>'
Run this command:
v4l2loopback-ctl set-caps /dev/video "YU12:640x480"
This script demonstrates how to disable system inactivity timeout in Gnome when running Rygel and restore it to the original value after exiting:
#!/bin/bash
# Save current inactivity timeout
TIMEOUT=$(gsettings get org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout)
echo "Current timeout: $TIMEOUT"
# Execute commands on Ctrl + C
function ctrl_c() {
echo "Exiting rygel..."
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout $TIMEOUT
echo "Inactivity timeout restored to $TIMEOUT. Bye!"
sleep 2
}
# Set the trap for Ctrl+C
trap ctrl_c INT
# Disable the inactivity timeout
gsettings set org.gnome.settings-daemon.plugins.power sleep-inactive-ac-timeout 0
# Briefly start rygel to allow it to add new files
timeout 2s rygel
# Run command to fix filenames
rygel-titlefix
# Actually run rygel
rygel
Example with watch command:
watch -n 1 'ps aux | kazy -i cmproxy -e kazy | kazy -r "[\d]+" -x | xargs -I % ls -l /proc/%/fd/ | kazy -i socket | wc -l'
Example with ttyplot command:
{ while true; do ps aux | kazy -i cmproxy -e kazy | kazy -r "[\d]+" -x | xargs -I % ls -l /proc/%/fd/ | kazy -i socket | wc -l; sleep 1; done } | ttyplot