The following shows up in dmesg output when turning backlight up or down (same message) on a Thinkpad T430, running Debian kernel package linux-image-3.4-trunk-amd64, booted using "acpi_backlight=vendor acpi_osi=Linux"
[ 104.916804] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 104.916812] thinkpad_acpi: unhandled HKEY event 0x6050
[ 104.916816] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx
The backlight switching works, but the (Gnome?) on-screen display shows level 1 of brightness if the command was to increase (irrespective of current level), or 0 if it was to decrease. More levels of brightness are available using the above boot options.
Cheers,
Mihai
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