It is the same for T440 on Ubuntu 14.04.3 with linux 3.13.0-65-generic
9.189536] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[ 9.189536] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 9.189537] thinkpad_acpi: ThinkPad BIOS GJET82WW (2.32 ), EC unknown
[ 9.189537] thinkpad_acpi: Lenovo ThinkPad T440, model 20B7003HBR
[ 9.190078] thinkpad_acpi: Unsupported brightness interface, please contact
ibm-acpi-de...@lists.sourceforge.net
[ 9.190091] thinkpad_acpi: radio switch found; radios are enabled
[ 9.190149] thinkpad_acpi: This ThinkPad has standard ACPI backlight
brightness control, supported by the ACPI video driver
[ 9.190149] thinkpad_acpi: Disabling thinkpad-acpi brightness events by
default...
[ 9.191111] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is
unblocked
[ 9.191467] thinkpad_acpi: Console audio control enabled, mode: monitor
(read only)
[ 9.192481] input: ThinkPad Extra Buttons as
/devices/platform/thinkpad_acpi/input/input9
** Changed in: linux (Ubuntu)
Status: Expired => New
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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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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