Linux/Documentation/ABI/testing/sysfs-class-backlight

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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1 What: /sys/class/backlight/<backligh 1 What: /sys/class/backlight/<backlight>/scale 2 Date: July 2019 2 Date: July 2019 3 KernelVersion: 5.4 3 KernelVersion: 5.4 4 Contact: Daniel Thompson <daniel.thompso 4 Contact: Daniel Thompson <daniel.thompson@linaro.org> 5 Description: 5 Description: 6 Description of the scale of th 6 Description of the scale of the brightness curve. 7 7 8 The human eye senses brightnes 8 The human eye senses brightness approximately logarithmically, 9 hence linear changes in bright 9 hence linear changes in brightness are perceived as being 10 non-linear. To achieve a linea 10 non-linear. To achieve a linear perception of brightness changes 11 controls like sliders need to 11 controls like sliders need to apply a logarithmic mapping for 12 backlights with a linear brigh 12 backlights with a linear brightness curve. 13 13 14 Possible values of the attribu 14 Possible values of the attribute are: 15 15 16 unknown 16 unknown 17 The scale of the brightness 17 The scale of the brightness curve is unknown. 18 18 19 linear 19 linear 20 The brightness changes linea 20 The brightness changes linearly with each step. Brightness 21 controls should apply a loga 21 controls should apply a logarithmic mapping for a linear 22 perception. 22 perception. 23 23 24 non-linear 24 non-linear 25 The brightness changes non-l 25 The brightness changes non-linearly with each step. Brightness 26 controls should use a linear 26 controls should use a linear mapping for a linear perception. 27 << 28 What: /sys/class/backlight/<backligh << 29 Date: Apr, 2010 << 30 KernelVersion: v2.6.35 << 31 Contact: Michael Hennerich <michael.henn << 32 Description: << 33 (RO) Get conversion value of t << 34 << 35 The value is automatically upd << 36 light sensor is enabled. << 37 << 38 The value range is device-driv << 39 << 40 For ADP8870: << 41 << 42 It returns integer between 0 << 43 brightness). << 44 << 45 For ADP8860: << 46 << 47 It returns a 13-bits integer << 48 << 49 What: /sys/class/backlight/<backligh << 50 Date: Apr, 2010 << 51 KernelVersion: v2.6.35 << 52 Contact: Michael Hennerich <michael.henn << 53 device-drivers-devel@blackfin. << 54 << 55 Description: << 56 (RW) Read or write the specifi << 57 backlight operates. << 58 << 59 The value meaning is device-dr << 60 << 61 For ADP8860: << 62 << 63 == ====================== << 64 0 Off: Backlight set to << 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 << 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/au << 82 operation. << 83 << 84 It can be enabled by writing t << 85 /sys/class/backlight/<backligh << 86 /sys/class/backlight/<backligh << 87 << 88 What: /sys/class/backlight/<backligh << 89 Date: Sep, 2009 << 90 KernelVersion: v2.6.32 << 91 Contact: device-drivers-devel@blackfin. << 92 Description: << 93 Control the maximum brightness << 94 on this <backlight>. Values ar << 95 will also show the brightness << 96 <ambient light zone>. << 97 << 98 The <ambient light zone> is de << 99 << 100 For ADP5520 and ADP5501, <ambi << 101 << 102 =========== ================= << 103 Ambient sysfs entry << 104 light zone << 105 =========== ================= << 106 daylight /sys/class/backli << 107 office /sys/class/backli << 108 dark /sys/class/backli << 109 =========== ================= << 110 << 111 For ADP8860, <ambient light zo << 112 << 113 =========== ================= << 114 Ambient sysfs entry << 115 light zone << 116 =========== ================= << 117 l1_daylight /sys/class/backli << 118 l2_office /sys/class/backli << 119 l3_dark /sys/class/backli << 120 =========== ================= << 121 << 122 For ADP8870, <ambient light zo << 123 << 124 =========== ================= << 125 Ambient sysfs entry << 126 light zone << 127 =========== ================= << 128 l1_daylight /sys/class/backli << 129 l2_bright /sys/class/backli << 130 l3_office /sys/class/backli << 131 l4_indoor /sys/class/backli << 132 l5_dark /sys/class/backli << 133 =========== ================= << 134 << 135 See also: /sys/class/backlight << 136 << 137 What: /sys/class/backlight/<backligh << 138 Date: Sep, 2009 << 139 KernelVersion: v2.6.32 << 140 Contact: device-drivers-devel@blackfin. << 141 Description: << 142 Control the dim brightness for << 143 on this <backlight>. Values ar << 144 set to 0. Full off when the ba << 145 This file will also show the d << 146 this <ambient light zone>. << 147 << 148 The <ambient light zone> is de << 149 << 150 For ADP5520 and ADP5501, <ambi << 151 << 152 =========== ================= << 153 Ambient sysfs entry << 154 light zone << 155 =========== ================= << 156 daylight /sys/class/backli << 157 office /sys/class/backli << 158 dark /sys/class/backli << 159 =========== ================= << 160 << 161 For ADP8860, <ambient light zo << 162 << 163 =========== ================= << 164 Ambient sysfs entry << 165 light zone << 166 =========== ================= << 167 l1_daylight /sys/class/backli << 168 l2_office /sys/class/backli << 169 l3_dark /sys/class/backli << 170 =========== ================= << 171 << 172 For ADP8870, <ambient light zo << 173 << 174 =========== ================= << 175 Ambient sysfs entry << 176 light zone << 177 =========== ================= << 178 l1_daylight /sys/class/backli << 179 l2_bright /sys/class/backli << 180 l3_office /sys/class/backli << 181 l4_indoor /sys/class/backli << 182 l5_dark /sys/class/backli << 183 =========== ================= << 184 << 185 See also: /sys/class/backlight << 186 <<

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Linux/Documentation/ABI/testing/sysfs-class-backlight

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Linux/Documentation/ABI/testing/sysfs-class-backlight