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1What: /sys/class/chromeos/<ec-device-name>/lightbar/brightness2Date: August 20153KernelVersion: 4.24Description:5 Writing to this file adjusts the overall brightness of6 the lightbar, separate from any color intensity. The7 valid range is 0 (off) to 255 (maximum brightness).8 9What: /sys/class/chromeos/<ec-device-name>/lightbar/interval_msec10Date: August 201511KernelVersion: 4.212Description:13 The lightbar is controlled by an embedded controller (EC),14 which also manages the keyboard, battery charging, fans,15 and other system hardware. To prevent unprivileged users16 from interfering with the other EC functions, the rate at17 which the lightbar control files can be read or written is18 limited.19 20 Reading this file will return the number of milliseconds21 that must elapse between accessing any of the lightbar22 functions through this interface. Going faster will simply23 block until the necessary interval has lapsed. The interval24 applies uniformly to all accesses of any kind by any user.25 26What: /sys/class/chromeos/<ec-device-name>/lightbar/led_rgb27Date: August 201528KernelVersion: 4.229Description:30 This allows you to control each LED segment. If the31 lightbar is already running one of the automatic32 sequences, you probably won’t see anything change because33 your color setting will be almost immediately replaced.34 To get useful results, you should stop the lightbar35 sequence first.36 37 The values written to this file are sets of four integers,38 indicating LED, RED, GREEN, BLUE. The LED number is 0 to 339 to select a single segment, or 4 to set all four segments40 to the same value at once. The RED, GREEN, and BLUE41 numbers should be in the range 0 (off) to 255 (maximum).42 You can update more than one segment at a time by writing43 more than one set of four integers.44 45What: /sys/class/chromeos/<ec-device-name>/lightbar/program46Date: August 201547KernelVersion: 4.248Description:49 This allows you to upload and run custom lightbar sequences.50 51What: /sys/class/chromeos/<ec-device-name>/lightbar/sequence52Date: August 201553KernelVersion: 4.254Description:55 The Pixel lightbar has a number of built-in sequences56 that it displays under various conditions, such as at57 power on, shut down, or while running. Reading from this58 file displays the current sequence that the lightbar is59 displaying. Writing to this file allows you to change the60 sequence.61 62What: /sys/class/chromeos/<ec-device-name>/lightbar/userspace_control63Date: August 201564KernelVersion: 4.265Description:66 This allows you to take the control of the lightbar. This67 prevents the kernel from going through its normal68 sequences.69 70What: /sys/class/chromeos/<ec-device-name>/lightbar/version71Date: August 201572KernelVersion: 4.273Description:74 Show the information about the lightbar version.75