The DMI quirk that was the fix for bug 281732 is not in place for the X200s. The DMI quirk should be a last resort though, so let's look for a better fix for the problem first.
First you should try the steps in the "Step-by-step troubleshooting" section of https://wiki.ubuntu.com/Hotkeys/Troubleshooting and report back your observations. Be sure to try the steps in the "Fixing broken keys" section of /usr/share/doc/udev/README.keymap.txt.gz if you don't get any key events from xev.
If you don't find any key events using that technique, try the following. Set your audio to be muted, then execute 'cat /proc/acpi/ibm/volume', then press the mute button and run the command again. Does the reported state change? Try the same thing again, but start with the audio unmuted.
Finally, run 'tail -f /var/log/kern.log', press the mute button, and see if you get any output in response. If you do, please report that output here.
The DMI quirk that was the fix for bug 281732 is not in place for the X200s. The DMI quirk should be a last resort though, so let's look for a better fix for the problem first.
First you should try the steps in the "Step-by-step troubleshooting" section of https:/ /wiki.ubuntu. com/Hotkeys/ Troubleshooting and report back your observations. Be sure to try the steps in the "Fixing broken keys" section of /usr/share/ doc/udev/ README. keymap. txt.gz if you don't get any key events from xev.
If you don't find any key events using that technique, try the following. Set your audio to be muted, then execute 'cat /proc/acpi/ ibm/volume' , then press the mute button and run the command again. Does the reported state change? Try the same thing again, but start with the audio unmuted.
Finally, run 'tail -f /var/log/kern.log', press the mute button, and see if you get any output in response. If you do, please report that output here.
Thanks!