Hello !
I own a brand new Lenovo E540 (20C600JHFR) fitted with a full HD LCD 
screen.

I've installed Ubuntu 14.04 LTS  and exploring the syslog file for 
unsupported hardware I've found the following message :
========
  thinkpad_acpi: Unsupported brightness interface, please contact 
ibm-acpi-devel@lists.sourceforge.net
[   11.725474] thinkpad_acpi: This ThinkPad has standard ACPI backlight 
brightness control, supported by the ACPI video driver
[   11.725476] thinkpad_acpi: Disabling thinkpad-acpi brightness events 
by default...
========

I noticed that the brightness control is very coarse instead of the 
smooth control experienced in Windows
How could I help ?
Many thanks in advance for your support.
Best regards.


---
  If the only tool you have is a hammer, you tend to see every problem 
as a nail. Abraham Maslow A British variant : Any tool can serve as a 
hammer but a screwdriver makes the best chisel.

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