Re: thinkpad_acpi: Unsupported brightness interface

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On Fri, 21 Nov 2014, Chongwen Huang wrote:
> [   12.167370] thinkpad_acpi: Lenovo ThinkPad X230, model 2306A71

> [   12.167839] thinkpad_acpi: Unsupported brightness interface, please
> contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx

This is normal, you can ignore that message.

> [   37.901936] thinkpad_ec: thinkpad_ec_request_row: arg0 rejected:
> (0x01:0x00)->0x00

There is no support for directly talking to the EC SBS and HDAPS subsystems
on any recent Lenovo boxes.  I can't help you with this, unfortunately.

We should be able to talk to the SBS (smart battery subsystem) through ACPI,
but that would require a _lot_ of research I can't do without a lot of
thinkpads to experiment with.  And all I have is an aging T43 :-)

HDAPS support requires a clean-room reverse engineering of the EC firmware.
Since "mg" has disappeared, and the tp-smapi author has also apparently
retired from thinkpads, we have no data and no one to write a driver.

-- 
  "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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