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diff --git a/src/w/thinkpad-x220.md b/src/w/thinkpad-x220.md index e69de29..7764308 100644 --- a/src/w/thinkpad-x220.md +++ b/src/w/thinkpad-x220.md @@ -0,0 +1,58 @@ +title: thinkpad x220 + +## performances + +On a linux installation, disabling mitigations can +[considerably increase the performances](https://linuxreviews.org/HOWTO_make_Linux_run_blazing_fast). +However, it comes with serious security issues. + +Add the following parameter for booting your kernel: + +``` +mitigations=off +``` + +## microphone + +The embbeded microphones can generate a static noise. According to the +[Archlinux wiki](https://wiki.archlinux.org/title/Lenovo_ThinkPad_X220#Microphone), +muting the right microphone fix this issue. + +> The following informations are about pulseaudio and its built-in module +> system. A more modern approache would be to use easyeffects. However I +> experienced noisy inputs/outputs while being on calls, and running it in the +> background requires to a) keep the easyeffects window opened b) move +> easyeffects to system tray. + +With pulseaudio/pipewire-pulse, the `remap-source` module can be loaded: + +``` +pactl load-module module-remap-source \ + "source_name=${source_name}" \ + "master=${source_index}" \ + use_master_format=1 \ + master_channel_map=front-left \ + channel_map=mono \ + channels=1 +``` + +However, the fans can still be heard, and not all voip clients handle noise +cancelling. Instead, you can keep the right microphone active and use it for +[noise cancellation](https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Modules/#module-echo-cancel) +(including the static noise). + +``` +$ pactl load-module module-echo-cancel \ + "source_name=${source_name}" \ + "master=${source_index}" \ + use_master_format=1 \ + aec_method="webrtc" \ + aec_args='"beamforming=1 mic_geometry=-1,0,0,1,0,0"' +``` + +See [my dotfiles](https://git.rgoncalves.se/dots/tree/.config/pipewire) for +additional information. + +## usb-c mod + +// todo |