After installing it, a simple # echo 255 > /sys/class/leds/tpacpi\:\:thinklight/brightness Support for controlling the light with ACPI is provided by thinkpad-acpi. Models without backlit keyboards only have ThinkLight on and ThinkLight off, which can be obtained by disabling the backlit keyboard in the BIOS of models with backlit keyboards installed. On models with backlit keyboards, there are 4 states: off, dim backlit, full backlit, and full backlit w/ ThinkLight.
Starting with the #30 series models (T430, T530, W530, etc), the keystroke was changed to Fn+Space in order to better accommodate the new 6-row keyboard layout. Just press Fn+PageUp to toggle its state between on and off. Here is a link to a page with a bunch of info on how to get at the ThinkLight from Linux and Windows.Īnd here is the important stuff in case the link breaks.Ĭontrolling the ThinkLight with the keyboard works on all systems since it relies on the BIOS exclusively. Ok, so I think this is as close as I am going to get to an answer and I would like to put it here for any future curious minds. That works so i guess I dont need to write something myself but I am still curious as to why I cant find a hook to it.Īs a learning exercise I would still like to know how to access the LED.
Is there any way for me to access the LED through C#, if not C# than perhaps another language?ĮDIT: I just found the keyboard key, I had bad info before, its Fn + Pgup. I have held back on posting here as the list is long but can if requested. This gives me about 291 different devices in the collection, none of which seem to match. This is the device enumeration code: DeviceInformationCollection devices = devices = await light.EnumerateDevices() This reults in lamp = null string selectorString = Lamp.GetDeviceSelector() ĭeviceInformationCollection devices = await DeviceInformation.FindAllAsync(selectorString) Lamp lamp = await Lamp.GetDefaultAsync() Here is the code I tried so far, condensed a bit. I also tried using the device enumeration method and that doesnt show anything that looks like the LED. I have tried using the new Lamp class in the windows 10 UWP API, and that doesnt work.
I see it come on for a split second when I cold boot the machine, I'm assuming this is part of the POST test or similar boot process and as such I would think there would be some way for me to connect to it. It isnt a backlight but is a single white LED next to the camera above the display. I would like to have access to the keyboard light without installing the Lenovo software. I then installed a clean image of windows 10, without all the bloatware. I upgraded it with an SSD and did the update from 7 to 10. I recently purchased a lenovo t420 laptop.
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