What: /sys/class/chromeos/<ec-device-name>/lightbar/brightness
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Date: August 2015
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KernelVersion: 4.2
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Description:
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Writing to this file adjusts the overall brightness of
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the lightbar, separate from any color intensity. The
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valid range is 0 (off) to 255 (maximum brightness).
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What: /sys/class/chromeos/<ec-device-name>/lightbar/interval_msec
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Date: August 2015
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KernelVersion: 4.2
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Description:
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The lightbar is controlled by an embedded controller (EC),
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which also manages the keyboard, battery charging, fans,
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and other system hardware. To prevent unprivileged users
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from interfering with the other EC functions, the rate at
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which the lightbar control files can be read or written is
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limited.
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Reading this file will return the number of milliseconds
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that must elapse between accessing any of the lightbar
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functions through this interface. Going faster will simply
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block until the necessary interval has lapsed. The interval
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applies uniformly to all accesses of any kind by any user.
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What: /sys/class/chromeos/<ec-device-name>/lightbar/led_rgb
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Date: August 2015
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KernelVersion: 4.2
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Description:
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This allows you to control each LED segment. If the
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lightbar is already running one of the automatic
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sequences, you probably won’t see anything change because
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your color setting will be almost immediately replaced.
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To get useful results, you should stop the lightbar
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sequence first.
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The values written to this file are sets of four integers,
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indicating LED, RED, GREEN, BLUE. The LED number is 0 to 3
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to select a single segment, or 4 to set all four segments
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to the same value at once. The RED, GREEN, and BLUE
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numbers should be in the range 0 (off) to 255 (maximum).
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You can update more than one segment at a time by writing
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more than one set of four integers.
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What: /sys/class/chromeos/<ec-device-name>/lightbar/program
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Date: August 2015
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KernelVersion: 4.2
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Description:
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This allows you to upload and run custom lightbar sequences.
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What: /sys/class/chromeos/<ec-device-name>/lightbar/sequence
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Date: August 2015
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KernelVersion: 4.2
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Description:
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The Pixel lightbar has a number of built-in sequences
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that it displays under various conditions, such as at
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power on, shut down, or while running. Reading from this
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file displays the current sequence that the lightbar is
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displaying. Writing to this file allows you to change the
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sequence.
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What: /sys/class/chromeos/<ec-device-name>/lightbar/userspace_control
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Date: August 2015
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KernelVersion: 4.2
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Description:
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This allows you to take the control of the lightbar. This
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prevents the kernel from going through its normal
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sequences.
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What: /sys/class/chromeos/<ec-device-name>/lightbar/version
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Date: August 2015
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KernelVersion: 4.2
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Description:
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Show the information about the lightbar version.
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