Unsupported brightness interface (T450s, model 20BWS02D00)

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Hi,

I saw the following messages in my kernel log:

[    1.783350] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[    1.783352] thinkpad_acpi: http://ibm-acpi.sf.net/
[    1.783354] thinkpad_acpi: ThinkPad BIOS JBET39WW (1.04 ), EC unknown
[    1.783355] thinkpad_acpi: Lenovo ThinkPad T450s, model 20BWS02D00
[    1.783904] thinkpad_acpi: Unsupported brightness interface, please contact 
ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
[    1.783986] thinkpad_acpi: radio switch found; radios are enabled
[    1.784079] thinkpad_acpi: This ThinkPad has standard ACPI backlight 
brightness control, supported by the ACPI video driver
[    1.784080] thinkpad_acpi: Disabling thinkpad-acpi brightness events by 
default...
[    1.785299] thinkpad_acpi: Console audio control enabled, mode: monitor 
(read only)

Brightness controls work fine, let me know if you need to know anything else. 
Kernel is 

3.18.6-1-ARCH #1 SMP PREEMPT Sat Feb 7 08:44:05 CET 2015 x86_64 GNU/Linux

Regards

Mirko

-- 
Mirko Stocker | mirko@stocker.email
Work: http://ifs.hsr.ch | http://infoq.com
Personal: http://misto.ch | http://twitter.com/m_st

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