I cannot get xbacklight to work at all due to Centos 7 not supporting it.
I am using a thinkpad p50s. I would like to be able to then bind the command to the buttons meant for brightness but I am unable to do so.
This is the output from 'dmesg | grep thinkpad_acpi'
[ 3.579866] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[ 3.579869] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 3.579870] thinkpad_acpi: ThinkPad BIOS N1KET21W (1.08 ), EC unknown
[ 3.579871] thinkpad_acpi: Lenovo ThinkPad P50s, model 20FLCTO1WW
[ 3.587378] thinkpad_acpi: detected a 8-level brightness capable ThinkPad
[ 3.587409] thinkpad_acpi: radio switch found; radios are enabled
[ 3.587559] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
[ 3.587560] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
[ 3.591080] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
[ 3.591620] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
[ 3.591784] thinkpad_acpi: Console audio control enabled, mode: monitor (read only)
[ 3.593760] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input6
[ 10.154636] thinkpad_acpi: EC reports that Thermal Table has changed