diff --git a/homepage/knowledge/linux.html b/homepage/knowledge/linux.html
index 58385f4..b72fc8f 100644
--- a/homepage/knowledge/linux.html
+++ b/homepage/knowledge/linux.html
@@ -16,7 +16,7 @@
 <SCRIPT SRC="/js/sheets.js"  TYPE="application/javascript"></SCRIPT>
 <SCRIPT TYPE="application/javascript">window.onload = window.initializesheets;</SCRIPT>
 <H1>linux</H1>
-<H3>updated 2022-05-01</H3>
+<H3>updated 2022-05-17</H3>
 <HR ALIGN="left" SIZE="1" WIDTH="25%" />
 <H2>ACPI client</H2>
 <P>
@@ -54,6 +54,41 @@ It's also a good idea to install any utilities you'll need on the bootstrapped s
 Text editors, network managers or utilities, and other administration tools, for example.
 Manual utilities such as <CODE>man-db</CODE> and others would also be useful.
 </P>
+<H3>Ubiquitous packages missing</H3>
+<P>From the anals of my notes, 2021-06-04:</P>
+<PRE>
+Had an issue with pacman missing some ubiquitous packages (esr's `ascii`, xorg-xev, etc).
+This fixed it. I don't really know why - maybe some issues with my repos?
+This was cleanly installed artix-openrc.
+
+[5:46 PM] Bassman Leyla: So what I did is I went into /etc/pacman.d/mirrorlist-arch and uncommented a local mirror
+[5:46 PM] Bassman Leyla: Then I appended a config block a package maintainer gave me onto /etc/pacman.conf
+[5:46 PM] Bassman Leyla: I'll paste it in
+[5:47 PM] Bassman Leyla:
+```
+#
+# ARCHLINUX
+#
+
+#[testing]
+#Include = /etc/pacman.d/mirrorlist-arch
+
+[extra]
+Include = /etc/pacman.d/mirrorlist-arch
+
+#[community-testing]
+#Include = /etc/pacman.d/mirrorlist-arch
+
+[community]
+Include = /etc/pacman.d/mirrorlist-arch
+
+#[multilib-testing]
+#Include = /etc/pacman.d/mirrorlist-arch
+
+#[multilib]
+#Include = /etc/pacman.d/mirrorlist-arch
+```
+</PRE>
 
 <H2>C Language</H2>
 <P>
@@ -307,6 +342,27 @@ Most audio servers recommend that they be run in userspace with user privileges,
 The Alpine wiki currently recommends <CODE>pipewire(1)</CODE>, with postmarketOS, which is based on Alpine, coming pre-configured with PipeWire.
 PipeWire is relatively new and the typical audio server used is PulseAudio; Debian and many popular Debian-based distributions come pre-configured with PulseAudio.
 </P>
+<H4>ALSA</H4>
+<UL>
+<LI><A HREF="https://wiki.alpinelinux.org/wiki/Main_Page/Adding_sound">Adding sound</A> (Alpine Linux Wiki)</LI>
+</UL>
+<P>
+The Alpine wiki ("Adding sound") says to install <CODE>alsa-conf</CODE>, <CODE>alsa-lib</CODE>, and <CODE>alsa-utils</CODE>,
+add yourself to the <CODE>audio</CODE> group, and then do some more configuration that I've never needed to do:
+Use <CODE>alsamixer(1)</CODE> to find a working sound card (press <CODE>F6</CODE> from the first screen ALSAMixer presents)
+and edit <CODE>/usr/share/alsa/alsa.conf</CODE> and change <CODE>defaults.ctl.card</CODE> and <CODE>defaults.pcm.card</CODE> to the sound card that works.
+</P>
+<P>
+The Alpine wiki doesn't mention this but you'll need to enable the <CODE>alsa</CODE> OpenRC service and either start it or reboot.
+I also installed <CODE>gstreamer</CODE> but I don't know why.
+</P>
+<P>
+ALSA is clunky, many people prefer to use a frontend such as Pipewire or PulseAudio that exposes its own interface while remaining compatible with ALSA.
+</P>
+<H4>OSS</H4>
+<P>
+Deprecated, unfortunately.
+</P>
 <H4>PipeWire</H4>
 <UL>
 <LI><A HREF="https://wiki.alpinelinux.org/wiki/PipeWire">PipeWire</A> (Alpine Linux Wiki)</LI>
@@ -323,6 +379,9 @@ This means you need <CODE>rtkit</CODE> installed and running through your initia
 </P>
 <H4>PulseAudio</H4>
 <P>
+On Alpine you'll need the <CODE>pulseaudio</CODE>, <CODE>pulseaudio-alsa</CODE>, and <CODE>alsa-plugins-pulse</CODE> packages for PulseAudio with ALSA compatibility.
+Start <CODE>pulseaudio(1)</CODE> when you want audio, ideally in your <CODE>.xinitrc</CODE>.
+</P>
 
 <H3>Media</H3>
 <P>