| 1 | What: /sys/class/backlight/<backlight>/scale |
| 2 | Date: July 2019 |
| 3 | KernelVersion: 5.4 |
| 4 | Contact: Daniel Thompson <[email protected]> |
| 5 | Description: |
| 6 | Description of the scale of the brightness curve. |
| 7 | |
| 8 | The human eye senses brightness approximately logarithmically, |
| 9 | hence linear changes in brightness are perceived as being |
| 10 | non-linear. To achieve a linear perception of brightness changes |
| 11 | controls like sliders need to apply a logarithmic mapping for |
| 12 | backlights with a linear brightness curve. |
| 13 | |
| 14 | Possible values of the attribute are: |
| 15 | |
| 16 | unknown |
| 17 | The scale of the brightness curve is unknown. |
| 18 | |
| 19 | linear |
| 20 | The brightness changes linearly with each step. Brightness |
| 21 | controls should apply a logarithmic mapping for a linear |
| 22 | perception. |
| 23 | |
| 24 | non-linear |
| 25 | The brightness changes non-linearly with each step. Brightness |
| 26 | controls should use a linear mapping for a linear perception. |
| 27 | |
| 28 | What: /sys/class/backlight/<backlight>/ambient_light_level |
| 29 | Date: Apr, 2010 |
| 30 | KernelVersion: v2.6.35 |
| 31 | Contact: Michael Hennerich <[email protected]> |
| 32 | Description: |
| 33 | (RO) Get conversion value of the light sensor. |
| 34 | |
| 35 | The value is automatically updated every 80 ms when the |
| 36 | light sensor is enabled. |
| 37 | |
| 38 | The value range is device-driver specific: |
| 39 | |
| 40 | For ADP8870: |
| 41 | |
| 42 | It returns integer between 0 (dark) and 8000 (max ambient |
| 43 | brightness). |
| 44 | |
| 45 | For ADP8860: |
| 46 | |
| 47 | It returns a 13-bits integer. |
| 48 | |
| 49 | What: /sys/class/backlight/<backlight>/ambient_light_zone |
| 50 | Date: Apr, 2010 |
| 51 | KernelVersion: v2.6.35 |
| 52 | Contact: Michael Hennerich <[email protected]>, |
| 53 | [email protected] |
| 54 | |
| 55 | Description: |
| 56 | (RW) Read or write the specific brightness level at which the |
| 57 | backlight operates. |
| 58 | |
| 59 | The value meaning is device-driver specific: |
| 60 | |
| 61 | For ADP8860: |
| 62 | |
| 63 | == ========================== |
| 64 | 0 Off: Backlight set to 0 mA |
| 65 | 1 Level 1: daylight |
| 66 | 2 Level 2: bright |
| 67 | 3 Level 3: dark |
| 68 | == ========================== |
| 69 | |
| 70 | For ADP8870: |
| 71 | |
| 72 | == ========================== |
| 73 | 0 Off: Backlight set to 0 mA |
| 74 | 1 Level 1: daylight |
| 75 | 2 Level 2: bright |
| 76 | 3 Level 3: office |
| 77 | 4 Level 4: indoor |
| 78 | 5 Level 5: dark |
| 79 | == ========================== |
| 80 | |
| 81 | Writing 0 returns to normal/automatic ambient light level |
| 82 | operation. |
| 83 | |
| 84 | It can be enabled by writing the value stored in |
| 85 | /sys/class/backlight/<backlight>/max_brightness to |
| 86 | /sys/class/backlight/<backlight>/brightness. |
| 87 | |
| 88 | What: /sys/class/backlight/<backlight>/<ambient light zone>_max |
| 89 | Date: Sep, 2009 |
| 90 | KernelVersion: v2.6.32 |
| 91 | Contact: [email protected] |
| 92 | Description: |
| 93 | Control the maximum brightness for <ambient light zone> |
| 94 | on this <backlight>. Values are between 0 and 127. This file |
| 95 | will also show the brightness level stored for this |
| 96 | <ambient light zone>. |
| 97 | |
| 98 | The <ambient light zone> is device-driver specific: |
| 99 | |
| 100 | For ADP5520 and ADP5501, <ambient light zone> can be: |
| 101 | |
| 102 | =========== ================================================ |
| 103 | Ambient sysfs entry |
| 104 | light zone |
| 105 | =========== ================================================ |
| 106 | daylight /sys/class/backlight/<backlight>/daylight_max |
| 107 | office /sys/class/backlight/<backlight>/office_max |
| 108 | dark /sys/class/backlight/<backlight>/dark_max |
| 109 | =========== ================================================ |
| 110 | |
| 111 | For ADP8860, <ambient light zone> can be: |
| 112 | |
| 113 | =========== ================================================ |
| 114 | Ambient sysfs entry |
| 115 | light zone |
| 116 | =========== ================================================ |
| 117 | l1_daylight /sys/class/backlight/<backlight>/l1_daylight_max |
| 118 | l2_office /sys/class/backlight/<backlight>/l2_office_max |
| 119 | l3_dark /sys/class/backlight/<backlight>/l3_dark_max |
| 120 | =========== ================================================ |
| 121 | |
| 122 | For ADP8870, <ambient light zone> can be: |
| 123 | |
| 124 | =========== ================================================ |
| 125 | Ambient sysfs entry |
| 126 | light zone |
| 127 | =========== ================================================ |
| 128 | l1_daylight /sys/class/backlight/<backlight>/l1_daylight_max |
| 129 | l2_bright /sys/class/backlight/<backlight>/l2_bright_max |
| 130 | l3_office /sys/class/backlight/<backlight>/l3_office_max |
| 131 | l4_indoor /sys/class/backlight/<backlight>/l4_indoor_max |
| 132 | l5_dark /sys/class/backlight/<backlight>/l5_dark_max |
| 133 | =========== ================================================ |
| 134 | |
| 135 | See also: /sys/class/backlight/<backlight>/ambient_light_zone. |
| 136 | |
| 137 | What: /sys/class/backlight/<backlight>/<ambient light zone>_dim |
| 138 | Date: Sep, 2009 |
| 139 | KernelVersion: v2.6.32 |
| 140 | Contact: [email protected] |
| 141 | Description: |
| 142 | Control the dim brightness for <ambient light zone> |
| 143 | on this <backlight>. Values are between 0 and 127, typically |
| 144 | set to 0. Full off when the backlight is disabled. |
| 145 | This file will also show the dim brightness level stored for |
| 146 | this <ambient light zone>. |
| 147 | |
| 148 | The <ambient light zone> is device-driver specific: |
| 149 | |
| 150 | For ADP5520 and ADP5501, <ambient light zone> can be: |
| 151 | |
| 152 | =========== ================================================ |
| 153 | Ambient sysfs entry |
| 154 | light zone |
| 155 | =========== ================================================ |
| 156 | daylight /sys/class/backlight/<backlight>/daylight_dim |
| 157 | office /sys/class/backlight/<backlight>/office_dim |
| 158 | dark /sys/class/backlight/<backlight>/dark_dim |
| 159 | =========== ================================================ |
| 160 | |
| 161 | For ADP8860, <ambient light zone> can be: |
| 162 | |
| 163 | =========== ================================================ |
| 164 | Ambient sysfs entry |
| 165 | light zone |
| 166 | =========== ================================================ |
| 167 | l1_daylight /sys/class/backlight/<backlight>/l1_daylight_dim |
| 168 | l2_office /sys/class/backlight/<backlight>/l2_office_dim |
| 169 | l3_dark /sys/class/backlight/<backlight>/l3_dark_dim |
| 170 | =========== ================================================ |
| 171 | |
| 172 | For ADP8870, <ambient light zone> can be: |
| 173 | |
| 174 | =========== ================================================ |
| 175 | Ambient sysfs entry |
| 176 | light zone |
| 177 | =========== ================================================ |
| 178 | l1_daylight /sys/class/backlight/<backlight>/l1_daylight_dim |
| 179 | l2_bright /sys/class/backlight/<backlight>/l2_bright_dim |
| 180 | l3_office /sys/class/backlight/<backlight>/l3_office_dim |
| 181 | l4_indoor /sys/class/backlight/<backlight>/l4_indoor_dim |
| 182 | l5_dark /sys/class/backlight/<backlight>/l5_dark_dim |
| 183 | =========== ================================================ |
| 184 | |
| 185 | See also: /sys/class/backlight/<backlight>/ambient_light_zone. |
| 186 | |