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57 lines
1.9 KiB
57 lines
1.9 KiB
What: /sys/class/backlight/<backlight>/bl_power |
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Date: April 2005 |
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KernelVersion: 2.6.12 |
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Contact: Richard Purdie <[email protected]> |
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Description: |
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Control BACKLIGHT power, values are FB_BLANK_* from fb.h |
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- FB_BLANK_UNBLANK (0) : power on. |
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- FB_BLANK_POWERDOWN (4) : power off |
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Users: HAL |
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What: /sys/class/backlight/<backlight>/brightness |
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Date: April 2005 |
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KernelVersion: 2.6.12 |
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Contact: Richard Purdie <[email protected]> |
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Description: |
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Control the brightness for this <backlight>. Values |
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are between 0 and max_brightness. This file will also |
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show the brightness level stored in the driver, which |
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may not be the actual brightness (see actual_brightness). |
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Users: HAL |
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What: /sys/class/backlight/<backlight>/actual_brightness |
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Date: March 2006 |
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KernelVersion: 2.6.17 |
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Contact: Richard Purdie <[email protected]> |
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Description: |
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Show the actual brightness by querying the hardware. |
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Users: HAL |
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What: /sys/class/backlight/<backlight>/max_brightness |
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Date: April 2005 |
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KernelVersion: 2.6.12 |
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Contact: Richard Purdie <[email protected]> |
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Description: |
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Maximum brightness for <backlight>. |
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Users: HAL |
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What: /sys/class/backlight/<backlight>/type |
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Date: September 2010 |
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KernelVersion: 2.6.37 |
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Contact: Matthew Garrett <[email protected]> |
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Description: |
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The type of interface controlled by <backlight>. |
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"firmware": The driver uses a standard firmware interface |
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"platform": The driver uses a platform-specific interface |
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"raw": The driver controls hardware registers directly |
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In the general case, when multiple backlight |
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interfaces are available for a single device, firmware |
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control should be preferred to platform control should |
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be preferred to raw control. Using a firmware |
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interface reduces the probability of confusion with |
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the hardware and the OS independently updating the |
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backlight state. Platform interfaces are mostly a |
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holdover from pre-standardisation of firmware |
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interfaces.
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