Trying to get my #Bluetooth headpones to work with #Ghostbsd has failed so far. I replaced #pulseaudio with #pipewire, but I found warnings that "headset pairing rarely works reliably because FreeBSD lacks robust support for A2DP and HSP profiles".

As a followup to my previous post, here's a simple bash script that will rotate the screen resolution on each call. I've added a MATE keyboard shortcut (CTRL+RIGHT) to run this script. It is intended for 1366x768 screens, so it will need adapting for other screens.
#!/usr/bin/env bash

RES="$(xdpyinfo | grep dimensions | sed -r 's/^[^0-9]*([0-9]+x[0-9]+).*$/\1/')"

# xdpy results can vary by 1 or two pixels so take the first two characters
RES="${RES:0:2}"

case "$RES" in

"13")
xrandr --output LVDS-1 --panning 1600x900 --scale 1.171x1.172
;;

"16")
xrandr --output LVDS-1 --panning 1920x1080 --scale 1.406x1.406
;;

*)
xrandr --output LVDS-1 --panning 1366x768 --scale 1x1
;;

esac
#ghostbsd #freebsd #mate #bash

Unfortunately several #Ghostbsd #MATE configuration windows are taller than my laptop's 768 pixels. I made both the top and bottom panels autohide, but a better solution is to use xrandr
sudo pkg install xrandr
type xrandr to get the name of your display, in my case LVDS-1 on my Thinkpad X220.

To change 16:9 screen resolution, you can type:
xrandr --output LVDS-1 --panning 1600x900 --scale 1.171x1.172
or
xrandr --output LVDS-1 --panning 1920x1080 --scale 1.406x1.406
To get back to the original resolution type:
xrandr --output LVDS-1 --panning 1366x768 --scale 1x1
You can add this to a keyboard shortcut and use it when those annoying panels show up the next time.

#Freebsd/#Ghostbsd acpi_ibm vs. #Linux thinkpad_acpi

Yep well, it's as I thought. Checking the source code I found that acpi_ibm only accepts a small subset of thinkpad events, and MICMUTE isn't one of them, contrary to Linux's thinkpad_acpi which accepts a far larger set (All?) including MICMUTE.

FYI, acpi_ibm accepts just these keyboard events:
LCD_BACKLIGHT
SUSPEND_TO_RAM
BLUETOOTH
SCREEN_EXPAND
SUSPEND_TO_DISK
BRIGHTNESS_UP
BRIGHTNESS_DOWN
THINKLIGHT
ZOOM
VOLUME_UP
VOLUME_DOWN
MUTE
ACCESS_IBM_BUTTON