Unsupported brightness interface, please contact

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I have a Lenovo W540.  dmesg shows the following output:

[    6.653717] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[    6.653718] thinkpad_acpi: http://ibm-acpi.sf.net/
[    6.653719] thinkpad_acpi: ThinkPad BIOS GNET66WW (2.14 ), EC unknown
[    6.653720] thinkpad_acpi: Lenovo ThinkPad W540, model 20BHS02400
[    6.654241] thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
[    6.654302] thinkpad_acpi: radio switch found; radios are enabled
[    6.654401] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
[    6.654402] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
[    6.657625] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
[    6.660294] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input10


What additional information can I provide?

--
Andrew
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