Little over a year ago I ordered 2 Yubico U2F security keys, through the Github offer. When they arrrived, I was immediately annoyed by the fact that only Chrome (and Chromium) supported the U2F standard. At that time, my main browser, did not support U2F at all, and the feature request had been open for a year, with no real progress. Sigh.

While upgrading the Linux kernel on my XPS13, I noticed that I could no longer find the option to enable the ASoC driver that is needed when the sound card is running in I2S mode. The symbol (SND_SOC_INTEL_BROADWELL_MACH) was still there, but it didn't show up at the expected location. I also had all dependencies enabled, so I was a bit surprised it didn't show up. After looking again, I noticed this in the dependencies:

DW_DMAC_CORE [=m]=y

It's not the first time I write about cgroups, but a lot has changed since I wrote that post.

Some time ago I noticed that I could no longer boot a remote machine via Wake-on-LAN. This annoyed me quite a bit, as the machine was 2100km away and there was nobody at that location who could boot it for me. I really had no clue why it stopped working. So when I recently arrived at the location again, I started looking into it. Everything I had previously configured was still in place. The BIOS option Power On by PCIE devices was enabled, and I still had this in /etc/local.d/wol.start:

#!/bin/sh

ethtool -s eth0 wol g

echo "GBE" > /proc/acpi/wakeup

Yet, when I ran ethtool eth0, it showed that WOL was disabled:

Since I hate typing passwords all the time, I looked for a way to automatically unlock my SSH keys at login. This guide focuses on KDE Plasma 5 and SDDM, but it should be easy to implement it for KDE Plasma 4 and other display managers as well.