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.

### Suspend

The laptop apparently does not support S3 and suspension upon closing the
laptop does not work out of the box. However, we can use `systemctl suspend` /
`systemctl suspend-then-hibernate`; see `/etc/systemd/logind.conf`.

### Dropbox and Skype

Install these using the `.deb` provided. `apt update` will complain about
missing certificates. To fix this:

```
# export GNUPGHOME=$(mktemp -d)
# gpg --keyserver keyserver.ubuntu.com --recv-keys D4040146BE3972509FD57FC71F3045A5DF7587C3
# gpg --export D4040146BE3972509FD57FC71F3045A5DF7587C3 > /etc/apt/trusted.gpg.d/skype.gpg
# gpg --keyserver keyserver.ubuntu.com --recv-keys 1C61A2656FB57B7E4DE0F4C1FC918B335044912E
# gpg --export 1C61A2656FB57B7E4DE0F4C1FC918B335044912E > /etc/apt/trusted.gpg.d/dropbox.gpg
```