Thanks for the reply.

1. The keyboard devices are

AT keyboard: input/event4
module: input/event7

2. The AT keyboard controls these hotkeys that work

scan code: 0xA0   key code: mute
scan code: 0xAE   key code: volumedown
scan code: 0xB0   key code: volumeup

The AT keyboard controls these hotkeys that has NO effect

scan code: 0x46   key code: scrolllock

(the Scroll Lock LED does not lit up)

The module (sony_laptop) controls these hotkeys that have NO effect

scan code: 0x0C   key code: fn_f1     # Should be 'touchpadtoggle'
scan code: 0x10   key code: brightnessdown
scan code: 0x11   key code: brightnessup
scan code: 0x12   key code: switchvideomode

3. cat /sys/class/dmi/id/sys_vendor
Sony Corporation

cat /sys/class/dmi/id/product_name
VPCEL2S1E

4. Attached.

** Attachment added: "Output from "udevadm info --export-db""
   
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/939868/+attachment/2957497/+files/udev-db.txt

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https://bugs.launchpad.net/bugs/939868

Title:
  Sony VPCEL2S1E, some hotkeys not working

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