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1. This site has an IPv6 problem that is like to the path MTU black hole problem because of upper hosting machine's linux kernel bug with OpenStack.
  If you cannot access this site via IPv6, please access via IPv4.

2. blog (Japanese version only)

3. FreeBSD memo

(1) dell xps12 9q33 (codec: realtek ALC668) hiss/white noise on headphone

  For headset jack is marked with the microphone terminal, I add the following to the /boot/device.hints as mic jack is recognized.

  hint.hdaa.1.nid27.config="as=4 seq=0 device=Mic conn=Jack loc=Left ctype=1/8 color=Black misc=0"

  misc information