title: how to make sysfs changes persistent in centos 7 (systemd)
body: <p>Trying to fix up the fn keys on my apple keyboard on CentOS 7, I've set</p>
  
  <pre><code>$ cat /etc/modprobe.d/hid_apple.conf
  options hid_apple fnmode=2
  </code></pre>
  
  <p>and yet after a reboot</p>
  
  <pre><code>$ cat /sys/module/hid_apple/parameters/fnmode
  1
  </code></pre>
  
  <p>Suggestions on the internet include running update-initramfs, which doesn't seem to exist on Centos 7, and doing the "echo 2 >> /sys/module/hid_apple/parameters/fnmode" in /etc/rc.local, which of course doesn't exist at all any more under systemd.</p>
  
  <p>What's the right way to persist that setting?</p>