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+Installation notes on the Yoga Slim 7, February 2023.
+This is with Debian Bookworm, which is testing at the moment.
+
+### Graphics
+
+- Need `firmware-amd-graphics` from `non-free`, the `amdgpu` module.
+- For the backlight we need `/etc/udev/rules.d/81-backlight.rules` to give the
+  `video` group permissions to change the backlight level; then we can write to
+  `/sys/class/backlight/amdgpu_bl0/brightness` (see `.i3/config`).
+
+### Wireless
+
+- Need `firmware-misc-nonfree` from `non-free`, the `mt7921` module.
+- Use `rfkill` to list the wireless devices, then `rfkill unblock` to remove
+  the soft blocks.
+
+### Audio
+
+- Need `firmware-sof-signed` from `non-free`(?), as well as `pulseaudio`.
+
+### Battery saving
+
+```
+$ sudo apt install tlp
+$ sudo systemctl enable tlp.service
+$ sudo tlp start
+```
+
+and see the settings in `/etc/tlp.conf`. Especially CPU scaling is important to
+reduce power usage on battery.