My Dev Machine Setup

A few days ago, I had a home server build. Today I want to have a clean OS reinstallation on my development machine. The primary reason is that the root partition is almost full (due to short-sightness when I first set up this machine). Apart from that, there are several other issues that I want to tackle:

  • I got a lot of __common_interrupt: 1.55 No irq handler for vector errors during the system bootup. There’s a thread in the Arch Forum discussing this issue. I tried booting up the system with different kernel parameters, but none helped. Seems like the only solution is to upgrade the BIOS firmware.
  • I cannot use my bluetooth keyboard to input decryption key to decrypt the root partition, because the bluetooth service is locked in the root partition and it’s a chicken-egg problem. This is quite disturbing, everytime I restarted the machine, I had to wire in my USB keyboard just to input the decryption key.

Upgrade BIOS Firmware

A word of warning: flashing motherboard BIOS is a dangerous operation. Make sure you read the motherboard manual thoroughly.

I’m using a Gigabyte X570 Aorus Master motherboard for this machine. It has a handy Q-Flash utility embedded in the ROM. The firmware upgrading process is very easy, just follow the manual.

Reinstall the Operating System

The installation is not much different from the OS installation on my home server, except that I don’t need a RAID and I don’t need to remote unlock the disk.

But I do want to have my bluetooth keyboard available before the root partition gets decrypted and mounted, so that I can use it to type in the decryption key.

Enable Bluetooth Keyboard before Disk Decryption

We need to bring the bluetooth service into the initramfs. Thankfully, someone has created a mkinitcpio hook for this purpose (kudos to the Arch Linux Community).

Some notes on this hook:

  • It does not work together with the systemd hook.
  • The project README says that it has only been tested on installation that uses rEFInd as boot loader. I’m using systemd-boot (previously called gummiboot), and this hook works just fine.

The bluetooth adapter needs to be auto powered on after boot. So I need to add the line AutoEnable=true to the Policy section in the configuration file /etc/bluetooth/main.conf:

# In /etc/bluetooth/main.conf

And I need to boot the system and manually pair my bluetooth keyboard for a first time. This is a one-off task. Upon next reboot, my keyboard becomes functional just before I’m asked to input the disk decryption key.

See also