Home / ubuntu / Questions / 372935
Accepted
Not Amused
Asked: 2013-11-09 02:51:23 +0800 CST

undo: sudo update-rc.d -f ondemand remove

  • 772

As the question says, I issued sudo update-rc.d -f ondemand remove cause that's what an article on configuring TLP says... but after doing the "configurations" my graphics went back to crap. So I uninstalled TLP re-installed my Graphics drivers, but I don't know how to undo the step described in the title of this question.

I read about update-rc.d and I issued sudo update-rc.d -f ondemand defaults

mymachine@deus:~$ sudo update-rc.d ondemand defaults
[sudo] password for mymachine: 
update-rc.d: warning: ondemand stop runlevel arguments (0 1 6) do not match LSB Default-Stop values (none)
 Adding system startup for /etc/init.d/ondemand ...
   /etc/rc0.d/K20ondemand -> ../init.d/ondemand
   /etc/rc1.d/K20ondemand -> ../init.d/ondemand
   /etc/rc6.d/K20ondemand -> ../init.d/ondemand
   /etc/rc2.d/S20ondemand -> ../init.d/ondemand
   /etc/rc3.d/S20ondemand -> ../init.d/ondemand
   /etc/rc4.d/S20ondemand -> ../init.d/ondemand
   /etc/rc5.d/S20ondemand -> ../init.d/ondemand

But I'm not sure if that fixed it, because I don't really know what I'm trying to fix (put back to how it was)

Help?

Thanks in advance.

settings

1 Answers

  1. Best Answer

    With sudo update-rc.d -f ondemand remove you removed the symlinks of this daemon. So the daemon is no longer executed while switching to the configured runlevel (or at bootup).

    I looked at my machine what's the default configuration of this service:

    user@host:~# find /etc/rc* -name "*ondemand*"
/etc/rc2.d/S99ondemand
/etc/rc3.d/S99ondemand
/etc/rc4.d/S99ondemand
/etc/rc5.d/S99ondemand

    So, we see the daemon starts in runlevels 2, 3, 4 and 5 with start number 99. To set that back to this configuration type:

    user@host:~# update-rc.d ondemand start 99 2 3 4 5 .
 Adding system startup for /etc/init.d/ondemand ...
   /etc/rc2.d/S99ondemand -> ../init.d/ondemand
   /etc/rc3.d/S99ondemand -> ../init.d/ondemand
   /etc/rc4.d/S99ondemand -> ../init.d/ondemand
   /etc/rc5.d/S99ondemand -> ../init.d/ondemand

    Edit

    According to the script /etc/init.d/ondemand the script sets every cpu governor to ondemand for every cpu that supports this setting.

    • A (scaling-)governor manages how the cpufrequency is adjusted automatically.
    • ondemand means that the frequency is adjusted to the current needs. The frequency can so change rapidly up or down.

    You can find out which governors are available for your cpus by:

    user@host:~$ cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_available_governors
userspace powersave conservative ondemand performance
userspace powersave conservative ondemand performance
userspace powersave conservative ondemand performance
userspace powersave conservative ondemand performance

    So yes it's the same configuration for all machines.

    • 1