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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.
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