Hi. I've got such message in a boot log.
[ 15.600331] thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
Lenovo ThinkPad x120e. Product ID:0596RZ6
uname -a
Linux igor-ThinkPad-X120e 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
I wish it would help you.
Best regards, Igor S.
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