Run modprobe on startup

Question

I need to run sudo modprobe wacom at startup to prevent an unrecoverable kernel panic (a blackscreen drop to terminal with repeating 1second audio looping and zero responsiveness) from occurring when a standard Wacom Intous (CTH-480) tablet is plugged into USB port on stock Xubuntu 14.04 LTS. I believe mainline kernel fixed this issue some time ago.

Where is the preferred location for this configuration? It must be run as root.

I have seen this How to run scripts on start up? but I am unsure which answer would work for the required permission level of modprobe.

Solution 1

You can add the line modprobe wacom to /etc/rc.local and it will get executed on boot with root privileges.

Solution 2

Check if you have a /etc/modules-load.d/wacom.conf file. If not, run this command:

sudo -i
echo wacom > /etc/modules-load.d/wacom.conf

This will create a configuration file ending in .conf and with content wacom.

Reboot and it will be loaded by systemd at boot time.

Solution 3

Just edit the file /etc/modules and add a new line with wacom.

You can reboot to check if it works.

---

If you do not have /etc/modules, try this one instead:

/etc/modules-load.d/modules.conf

Even if it should be not a problem since in Debian-like or Ubuntu-like ecc. they are symlinked.

Comments

[Salami]

This would have it load relatively late in the boot sequence.

[Yan King Yin]

I find that the command has to be delayed a bit, eg: (sleep 15s && [your command...]) &

[FreeSoftwareServers]

This is the correct method. rc.local is deprecated and doesn't work correctly and I also found I needed to use sleep if I hacked it, but this method just works and is "proper"