Hello Hui,
the DKMS file you provided here could not make the LED work.

Steps:
1. Create an entry at /etc/udev/hwdb.d/60-dell-mic-mute-hotkey.hwdb with the 
following content:
# Dell platform kernel driver
keyboard:name:Dell WMI hotkeys:dmi:bvn*:bvr*:bd*:svnDell*:pn*
 KEYBOARD_KEY_150=f20 # Mic mute toggle

2. Update it with
sudo udevadm hwdb -u

3. Install the DKMS file provided in comment #5

4. reboot and test the mic mute key.

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https://bugs.launchpad.net/bugs/1381856

Title:
  [Dell Latitude E5550] Microphone mute key does not work on this system

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