Re: ACPI Suspend (Fn+4) key stops working after upgrading ThinkPad P50 BIOS from 1.15 to 1.17: unknown version of the HKEY interface: 0x200

[Vishnu Mohan <vishnu2kmohan@xxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxxxx
[    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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