OSD - Lubuntu on X201

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Hello,
I am new to Linux, and I installed Lubuntu 14.04.1 on my X201.

Everything seems to be working including volume up and down keys, but there is no On Screen Display for volume up and down.

I searched on the internet, and I came across the page https://help.ubuntu.com/community/T60. So, I added the folllowing line to my rc.local.
sudo cp /sys/devices/platform/thinkpad_acpi/hotkey_all_mask /sys/devices/platform/thinkpad_acpi/hotkey_mask

But, there is still no OSD for volume up and down.
The system is usable, but I would like to have OSD.
Is anyone running Lubuntu on an X201? Is OSD working? If yes, how did you do it? Can anyone explain what I can do?

Incidentally, I tried tpb (Think Pad Buttons), but it doesn't really work..
I mean, the OSD bar appears, but always "full"..