I see this error in red during boot so I thought I'd contact you:
"Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx"
This is the full output from thinkpad_acpi from journalctl:
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: ThinkPad ACPI Extras v0.25
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: http://ibm-acpi.sf.net/
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: ThinkPad BIOS G6ETA1WW (2.61 ), EC unknown
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: Lenovo ThinkPad X1 Carbon, model 344822U
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: radio switch found; radios are enabled
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: possible tablet mode switch found; ThinkPad in laptop mode
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
Apr 01 19:01:36 laphog kernel: thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
-Tyler
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