Hi, I saw the following messages in my kernel log: [ 1.783350] thinkpad_acpi: ThinkPad ACPI Extras v0.25 [ 1.783352] thinkpad_acpi: http://ibm-acpi.sf.net/ [ 1.783354] thinkpad_acpi: ThinkPad BIOS JBET39WW (1.04 ), EC unknown [ 1.783355] thinkpad_acpi: Lenovo ThinkPad T450s, model 20BWS02D00 [ 1.783904] thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx [ 1.783986] thinkpad_acpi: radio switch found; radios are enabled [ 1.784079] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver [ 1.784080] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default... [ 1.785299] thinkpad_acpi: Console audio control enabled, mode: monitor (read only) Brightness controls work fine, let me know if you need to know anything else. Kernel is 3.18.6-1-ARCH #1 SMP PREEMPT Sat Feb 7 08:44:05 CET 2015 x86_64 GNU/Linux Regards Mirko -- Mirko Stocker | mirko@stocker.email Work: http://ifs.hsr.ch | http://infoq.com Personal: http://misto.ch | http://twitter.com/m_st ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel