Install and Select Ubuntu Kernel at Boot Time

Ubuntu 20.04LTS has kernel 5.4 running. After upgrading to 5.7.1, the printer lost and iBus input issues still exist.

1. Change the Kernel Build
2. Display Grub for Kernel Select

Moving to Ryzen 3 2200G and Improve Jonsbo C2’s Airflow

Because of the Microarchitectural Data Sampling (MDS)^[1] vulnerabilities in 2018, computers have a huge performance impact after mitigation. Apple suggests disabling hyper-threading (HT) for full mitigation.^[2] My i3-370 (ThinkPad T410i), i5-6200u (ThinkPad L460), and i5-3210M (Mac Mini Late 2012) are all using HT. Maybe that’s why they slowdown considerably since 2019.

On the other hand, J3455 is a quad-core processor. It’s more responsive than the dual-core and the dual-core-quad-thread processors. I decided to build the next primary desktop with an AMD quad-core processor without simultaneous multithreading (SMT)^[3].

1. Computer Parts
2. Implementation
3. Temperature and Power Consumption
4. Concerns

Upgrade J3455B-ITX’s 5×5 CPU Fan to a 12×12 Intake Fan

In my previous post^[1], a 5×5 CPU fan solve the heating issue. When I restore the HDD frame, it blocks the CPU fan to pull enough cold air through the roof vent holes aka ventilation holes.

Geeek A1 Mini-ITX case^[2] has room for 4 5x5cm case fans and a 9x9cm CPU fan. Sound like a perfect solution. But after watching YouTube videos from TastyPC (7:02, 7:37)^[3], Tech By Matt (1:26)^[4], and Cevin T.^[5], I decided to customize the case and upgrade to a more powerful case fan. It’s more fun.

1. Improve Wind Tunnel for the CPU Heatsink
2. Upgrade to a 12×12 Roof Fan

Ubuntu: My Missing Manuals

1. Driver Installation
2. Software Installation
3. Customization
4. Accelerators
5. Issues

Build the Linux Kernel Module to Enable RTL8812AU USB Wireless Dongles

There is no built-in support for Realtek RTL8812AU^[1][2] in Linux. To enable, I have to download the RTL8122AU driver source code, compile to a kernel module, and add to the kernel.

Following USB wireless dongles use the RTL8812AU chipset:

1. D-Link DWA-171 A1^[3]
2. Edimax EW-7811UTC^[4]
3. netis WF2190^[5]

Quick Summary

For Ubuntu 18.04 LTS and 20.04LTS, follow these steps:

$sudo apt-get update
$sudo apt-get install dkms git
$git clone https://github.com/aircrack-ng/rtl8812au.git
$cd ~/rtl8812au
$sudo ./dkms-install.sh
$sudo modprobe 88XXau

Install and Use Chinese Input in Ubuntu

1. Install and Configure Rime for iBus
2. Install and Configure Pinyin for iBus
3. Install and Configure Google Pinyin for iBus
4. Install and Configure Rime for Fcitx
5. Install and Configure Google Pinyin for Fcitx
6. Remove Google Pinyin for Fcitx and Restore Rime for iBus
7. Switch Between iBus and Fcitx

Moving Celeron G3900 to the Smallest Micro-ATX Case: Jonsbo C2

The computer case for my Celeron G3900 has 4 fans. Air circulation is great but it is too big to fit on the table. I want to move it to a smaller case and keep cool.

1. Background Information
2. Requirement
3. Evaluation
4. Decision
5. Special Topics

Jonsbo C2 is smaller than some Mini-ITX cases but accepts a Micro-ATX motherboard.

Add a Fan to Resolve J3455B-ITX’s Heating Issue

My J3455 computer is quiet but runs hot in the tiny Mini-ITX case^[1]. I decided to use a fan to improve air circulation to cool.

The case is about the size of the Mini-ITX motherboard.

Hyper-V on Windows 10 Pro: My Missing Manual

Here is a list of accelerators and mini how-to related to Hyper-V in Windows 10 Pro^[1] which is different from the Hyper-V on Windows Server^[2]. It will be maintained and updated regularly.

Turnkey Linux: My Missing Manual

Here is a list of files and directories, mini how-to, and etc. related to TurnKey Linux^[1]. It will be maintained and updated regularly.