The problem still persists after upgrading to BIOS 1.19 and Kernel 4.4.3: $ uname -a Linux p50 4.4.3-gentoo #2 SMP PREEMPT Mon Feb 29 10:05:14 EST 2016 x86_64 Intel(R) Xeon(R) CPU E3-1505M v5 @ 2.80GHz GenuineIntel GNU/Linux
$ sudo dmesg | grep -i thinkpad_acpi [ 3.196513] thinkpad_acpi: ThinkPad ACPI Extras v0.25 [ 3.196514] thinkpad_acpi: http://ibm-acpi.sf.net/ [ 3.196515] thinkpad_acpi: ThinkPad BIOS N1EET45W (1.19 ), EC unknown [ 3.196516] thinkpad_acpi: Lenovo ThinkPad P50, model 20ENCTO1WW [ 3.197388] thinkpad_acpi: detected a 16-level brightness capable ThinkPad [ 3.197400] thinkpad_acpi: unknown version of the HKEY interface: 0x200 [ 3.197419] thinkpad_acpi: please report this to ibm-acpi-devel@lists.sourceforge.net [ 3.197442] thinkpad_acpi: radio switch found; radios are enabled [ 3.197518] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driv er [ 3.197519] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default... [ 3.198448] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked [ 3.198974] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one [ 3.201025] input: ThinkPad Extra Buttons as /devices/platform/ thinkpad_acpi/input/input6 http://support.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-p-series-laptops/thinkpad-p50/downloads/DS106109 http://support.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-p-series-laptops/thinkpad-p50/downloads/DS106108
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