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[Alex Murray <murray.alex@xxxxxxxxx>]

No Ubuntu does not try to control the backlight based on the ambient
brightness.

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https://bugs.launchpad.net/bugs/626079

Title:
  light sensor is not read ? (Lucid, MacbookPro 6.2)

Status in Mactel Support:
  Invalid

Bug description:
  Hello,

  
  I have a macbook pro 6.2 with lucid 64 bits (installed following this: https://help.ubuntu.com/community/MacBo … ucid#Video) and I try to read the output of light sensors in order to smartly control the screen and keyboard light.

  1st question: It seems this functionnality did exist on previous
  ubuntu versions, right ?

  2nd question: I should just have to read the 'light' file which contains the output of light sensors:
  ~$ cat /sys/devices/platform/applesmc.768/light
  (0,0)

  
  The trouble is this file always contains this (0,0), whatever the ambient light conditions are..


  Nevertheless:

  
  Code:

  ~$ dmesg|grep apple
  [ 4.496393] apple 0003:05AC:0237.0001: input,hidraw0: USB HID v1.11 Keyboard [Apple Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:1a.7-1.2/input0
  [ 4.499260] apple 0003:05AC:0237.0002: hidraw1: USB HID v1.11 Device [Apple Inc. Apple Internal Keyboard / Trackpad] on usb-0000:00:1a.7-1.2/input1
  [ 4.502979] apple 0003:05AC:8242.0003: hiddev96,hidraw2: USB HID v1.11 Device [Apple Computer, Inc. IR Receiver] on usb-0000:00:1d.7-1.2/input0
  [ 8.198273] applesmc: Apple MacBook Pro 6 detected:
  [ 8.198275] applesmc: - Model with accelerometer
  [ 8.198277] applesmc: - Model with light sensors and backlight
  [ 8.198278] applesmc: - Model with 18 temperature sensors
  [ 8.199332] applesmc: device has already been initialized (0xe0, 0xf.
  [ 8.199334] applesmc: device successfully initialized.
  [ 8.200274] applesmc: 2 fans found.
  [ 8.203250] input: applesmc as /devices/platform/applesmc.768/input/input10
  [ 8.203395] applesmc: driver successfully loaded.
  [ 25.056833] applesmc: light sensor data length set to 10
  [ 64.788156] applesmc: wait status failed: 5 != 0
  [ 80.741403] applesmc: wait status failed: 4 != 0
  [ 144.690224] applesmc: wait status failed: 5 != 1
  [ 224.599671] applesmc: wait status failed: 5 != 1

  (full output of this command in the attached file)

  So it seems the system is recognizing light sensors ?

  On the other hand:

  
  Code:

  :~$ sensors
  applesmc-isa-0300
  Adapter: ISA adapter
  Left side :2585 RPM (min = 2000 RPM)
  Right side :2574 RPM (min = 2000 RPM)
  TB0T: +42.5°C 
  TB1T: +42.5°C 
  TB2T: +37.2°C 
  TC0C: +60.0°C 
  TC0D: +61.5°C 
  TC0P: +62.0°C 
  TC1C: +62.0°C 
  TG0D: +61.0°C 
  TG0P: +57.0°C 
  TG0T: +61.5°C 
  TMCD: +62.0°C 
  TP0P: +67.5°C 
  TPCD: +75.0°C 
  Th1H: +53.8°C 
  Th2H: +52.8°C 
  Tm0P: +70.2°C 
  Ts0P: +35.5°C 
  Ts0S: +47.2°C

  
  here no light sensors..

  
  I also tried:

  Code:

  ~$ hal-find-by-capability --capability light-sensor --verbose
  Found 0 device objects of capability 'light-sensor'