Ubuntu
Fix ubuntu sound delay problem
Introduction
These are the quick fix for 2 second delay when playing audio sound on ubuntu linux system
Methods
1. Disable the audio idle mode
Go to /etc/pulse/default.pa and
comment on this line
### Automatically suspend sinks/sources that become idle for too long #load-module module-suspend-on-idle
Find module-udev-detect & module-detect and insert tsched=0 to the back of them.
#enable the interupt based timing load-module module-udev-detect tsched=0 load-module module-detect tsched=0
Restart your computer to apply the new configuration.
2. Create a dummy sound generator
If method 1 is not working, proceed to this step
This is a systemd service to generate a silent sound to occupy the sound channel.
Create a systemd file as /etc/systemd/system/audio_non_stop.service
#audio_non_stop.service [Unit] Description="Create a silent sound to keep the audio HDMI digital output running" After=sound.target [Service] ExecStart=/usr/bin/aplay -c2 -r48000 -fS16_LE /dev/zero #Restart=on-failure ExecStop=/bin/kill -INT $MAINPID KillSignal=SIGINT #TimeoutStopSec=10 [Install] WantedBy=graphical.target
After resuming the computer on hibernate mode, you need to restart the audio_non_stop.service and make it occupy the HDMI digital sound module again.
Then create another systemd service as /etc/systemd/system/audio_non_stop_resume.service
#audio_non_stop_resume.service [Unit] Description="Restart the audio_non_stop.services after resume from hibernate" After=suspend.target [Service] Type=oneshot ExecStart=/usr/bin/systemctl --no-block restart audio_non_stop.service [Install] WantedBy=suspend.target
Reference
https://askubuntu.com/questions/218444/sound-output-starts-delayed
https://unix.stackexchange.com/questions/362223/short-audio-playback-is-muted-requires-warming-up-or-secondary-audio-in-backgro
https://bbs.archlinux.org/viewtopic.php?id=183447
https://askubuntu.com/questions/1033405/crackling-and-delayed-sound-after-upgrading-to-18-04
https://askubuntu.com/questions/371595/for-pulseaudio-what-does-tsched-do-and-what-are-the-defaults
WiFi Hotspot on startup
Introduction
Procedure
1. Initial the hotspot
This step is very easy. Just turn on the wifi hotspot mode once on the ubuntu wifi setting page. Then turn it off.
2. Modify WiFi Hotspot setting
Using nmtui to modify the setting. Then select Wi-Fi -> Hotspot. Then modify the setting. Also, please start the nmtui in sudo mode.
Some Recommend Setting:
# Recommend Setting Mode <Access Point> Security <WPA & WPA2 Personal> IPv4 CONFIGURATION <Sharded> Addresses 192.168.100.1/24 IPv4 CONFIGURATION <Ignore> [x] Automatically Connect
3. Verify the setting
Go to “/etc/NetworkManager/system-connections/Hotspot”
to check.
[connection] id=Hotspot uuid=XXXX-XXXX-XXXX-XXXX-XXXX type=wifi permissions= autoconnect=true [wifi] mac-address=XX:XX:XX:XX:XX:XX mac-address-blacklist= mode=ap ssid=WIFISSID [wifi-security] key-mgmt=wpa-psk psk=WIFIPASSWORD [ipv4] address1=192.168.100.1/24 dns-search= method=auto [ipv6] addr-gen-mode=stable-privacy dns-search= method=ignore
Install Cangjie on ubuntu 18.04
1. Install iBus Package
#install required package sudo apt-get install ibus ibus-clutter ibus-gtk ibus-gtk3 ibus-qt4 ibus-table-cangjie #Select the input method to ibus im-config -s ibus
2. Install Chinese Language Package
From system setting -> Region & Language -> Manage Installed Language -> Install/ Remove Languages button
Install the Chinese(traditional) language package
After that, check iBus is selected on the Keyboard input method system’s option.
You may need to reboot the system after the Chinese language package installation.
3. Add Cangjie to input source
From system setting -> Region & Language -> Chinese
Add Chinese (Cangjie3) to the Input source table
Lester Work Space 