On Mon, Jan 11, 2016, at 19:12, Johannes Stezenbach wrote:
I can confirm this, my x230 has both. FWIW, BIOS hotkey
Fn+Space cycles through off, dim backlight, full backlight
and full thinklight. /sys/class/leds/tpacpi::thinklight/brightness
can be read (showing either 0 or 255) but writes are ignored.
Dito for /proc/acpi/ibm/light.
We likely need to integrate better (future work) the new backlight
control with the thinklight control and the firmware interface in the
Is the ACPI AML for fn+space readable enough, or is it trapping directly
into SMM? Because if it interacts with the traditional higher-level
ACPI AML we already use to talk to the thinklight (and now to the
backlight), it should be relatively easy to fix the driver to better
support the x230.