Re: TP 460 Yoga tablet mode switch not supported

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On Fri, 19 Feb 2016, Daniel Turton wrote:
> I've recently picked up a Thinkpad 460 Yoga, and it appears that the tablet
> switch isn't supported just yet. "event 0x60c0" is repeated whether the
> screen is swung back or forward. Here's the debug output from syslog:
> 
> Feb 14 22:29:52 DT-Yoga-14 kernel: [13921.288473] thinkpad_acpi: unknown
> possible thermal alarm or keyboard event received Feb 14 22:29:52
> DT-Yoga-14 kernel: [13921.288559] thinkpad_acpi: temperatures (Celsius): 47
> 37 43 47 47 0 41 37 Feb 14 22:29:52 DT-Yoga-14 kernel: [13921.288578]
> thinkpad_acpi: unhandled HKEY event 0x60c0 Feb 14 22:29:52 DT-Yoga-14
> kernel: [13921.288585] thinkpad_acpi: please report the conditions when
> this event happened to ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
> 
> Let me know if anything else is needed, and how I can get started on
> submitting a patch to you.

It is necessary to locate in the ACPI tables the register that contains the
current mode.  Event 0x60c0 only tells you that "it changed", so we need to
be able to know "to what"...

Hopefully, tracing in the ACPI DSDT and XSDT dumps for what sends event
0x60c0 will also show candidates of the method or register that can be used
to query the current state of the switch.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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