Stopping timidity seems to fix the busy problem.
~$ sudo cat /dev/rtc cat: /dev/rtc: Device or resource busy ~$ sudo /etc/init.d/timidity stop * Stopping TiMidity++ ALSA midi emulation... ...done. ~$ sudo cat /dev/rtc cat: /dev/rtc: Invalid argument
Stopping timidity seems to fix the busy problem.
~$ sudo cat /dev/rtc d/timidity stop
cat: /dev/rtc: Device or resource busy
~$ sudo /etc/init.
* Stopping TiMidity++ ALSA midi emulation...
...done.
~$ sudo cat /dev/rtc
cat: /dev/rtc: Invalid argument