Same message with Ubuntu 14.10 64 bit on a ThinkPad E540:

[   15.678400] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[   15.678403] thinkpad_acpi: http://ibm-acpi.sf.net/
[   15.678405] thinkpad_acpi: ThinkPad BIOS J9ET88WW (2.08 ), EC unknown
[   15.678406] thinkpad_acpi: Lenovo ThinkPad Edge E540, model 20C600JDIX
[   15.679077] thinkpad_acpi: Unsupported brightness interface, please contact 
[email protected]
[   15.679232] thinkpad_acpi: This ThinkPad has standard ACPI backlight 
brightness control, supported by the ACPI video driver
[   15.679234] thinkpad_acpi: Disabling thinkpad-acpi brightness events by 
default...
[   15.683438] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is 
unblocked
[   15.685627] thinkpad_acpi: Console audio control enabled, mode: monitor 
(read only)

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https://bugs.launchpad.net/bugs/1389456

Title:
  "thinkpad_acpi: Unsupported brightness interface" error message during
  boot with Thinkpad T440S

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