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With newer kernels the HPET (High Precision Event Timer) replaces the RTC. The RTC emulation by HPET does not seem to create a link between /proc/sys/dev/rtc/max-user-freq and /proc/sys/dev/hpet/max-user-freq so that seamless change is possible. The following code change to /etc/init.d/mythtv-backend adds a test to see if either RTC or HPET exist, and only tried to update max-user-freq if it does. If may be worth printing an error message to the log if it does not.

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case "$1" in start) if test -e $RUNDIR/$NAME.pid ; then echo "mythbackend already running, use restart instead." else # set the timeslice to 1/1024 of a sec for smoother mythtv and xine and mplayer playback if [ -w /proc/sys/dev/rtc/max-user-freq ] # check if RTC (older kernels) exists and I can write to it # failure is not an option! then echo 1024 > /proc/sys/dev/rtc/max-user-freq elif [ -w /proc/sys/dev/hpet/max-user-freq ] # or newer kernels with the High Precision Timer (HPET) # may or may not emulate the older RTC fully then echo 1024 > /proc/sys/dev/hpet/max-user-freq fi # start starting the startup of mythtv echo -n "Starting $DESC: $NAME " start-stop-daemon --start --pidfile $RUNDIR/$NAME.pid
--chuid $USER --nicelevel $NICE --exec $DAEMON -- $ARGS echo "." fi ;;