ThinkPad W520 Brightness Control Issues

[Andrew Immerman <ahimmerman@xxxxxxxxx>]

Hello,

I have a Lenovo ThinkPad W520 4276-39U and am unable to control LCD brightness.

The laptop is running Linux Mint 13 Maya, the distro-stock 3.2.0-23 kernel, the acpi_backlight=vendor boot parameter and, what appears to be, a fully patched thinkpad_acpi.ko.  Not sure if it's relevant, though, it's running on an NVIDIA Quadro 1000M GF108GL set to discrete mode (I think), with X.Org X Server 1.11.3 and the NVIDIA version 295.40 driver.

When I click the Fn+Home or Fn+End (LCD brightness up and down), the brightness slider pops up, though the slider doesn't indicate changes, and there's no brightness change.  Additionally, thinkpad_acpi is logging the following:

• unknown possible thermal alarm or keyboard event received
  unhandled HKEY event 0x6050
  please report the conditions when this event happened to ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx

Please advise.

Thank you in advance,

Andrew

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