wiki/thinkpad-x220: Add micmute button fix

1 files changed, 37 insertions, 12 deletions

diff --git a/src/w/thinkpad-x220.md b/src/w/thinkpad-x220.md
index 7764308..3b12aa3 100644
--- a/src/w/thinkpad-x220.md
+++ b/src/w/thinkpad-x220.md
@@ -27,13 +27,13 @@ muting the right microphone fix this issue.
 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
+$ 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
@@ -43,16 +43,41 @@ cancelling. Instead, you can keep the right microphone active and use it for
 
 ```
 $ 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"'
+    "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.
 
+## audio led buttons
+
+On some ThinkPad models, audio led buttons can be broken and desynchronized
+on linux `5.15.x`.
+
+A quick workaround is to catch the key press events (in your dwm configuration,
+i3, sway, etc ...) and force the synchronization of the leds.
+
+For the microphone:
+
+```
+$ pactl get-source-mute @DEFAULT_SOURCE@ | grep no >/dev/null 2>&1
+$ echo "${?}" > /sys/class/leds/platform::micmute/brightness
+```
+
+For the audio sink:
+
+```
+$ pactl get-sink-mute @DEFAULT_SINK@ | grep no >/dev/null 2>&1
+$ echo "${?}" > /sys/class/leds/platform::mute/brightness
+```
+
+See my [dotfiles](https://git.rgoncalves.se/dots/tree/.bin/ag-audio) and
+[the related pipewire issue](https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1849).
+
 ## usb-c mod
 
 // todo