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183.amir

Member

Registered: 2014-05-15

Posts: 14

Where can I read the backlight sensor values on my laptop

Hello,

I have a Vaio pro 13 laptop and it has a light sensor. While the sensor works and automatically adjusts my keyboard brightness, it doesn't adjust my display brightness. I was wondering where can I read the values reported from this backlight sensor.

ls /sys/class/backlight/
acpi_video0  intel_backlight

Both represent the display brightness values.

ls /sys/devices/platform/sony-laptop 
battery_care_health   driver         kbd_backlight_timeout  power      thermal_control   touchpad
battery_care_limiter  kbd_backlight  modalias               subsystem  thermal_profiles  uevent

`kbd_backlight` represents the keyboard backlight not the sensor.

ls /sys/class/leds/phy0-led 
brightness  device  max_brightness  power  subsystem  trigger  uevent

This not the sensor too.

sudo find /sys -name '*bright*'
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/brightness
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/max_brightness
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight/actual_brightness
/sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness
/sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/max_brightness
/sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/actual_brightness
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/leds/phy0-led/brightness
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/leds/phy0-led/max_brightness
/sys/module/i915/parameters/invert_brightness
/sys/module/video/parameters/brightness_switch_enabled

sudo find /sys -name '*light*'
/sys/fs/cgroup/devices/system.slice/system-systemd\x2dbacklight.slice
/sys/fs/cgroup/systemd/system.slice/system-systemd\x2dbacklight.slice
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight
/sys/devices/pci0000:00/0000:00:02.0/backlight
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/net/wlp1s0/queues/tx-0/byte_queue_limits/inflight
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/net/wlp1s0/queues/tx-1/byte_queue_limits/inflight
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/net/wlp1s0/queues/tx-2/byte_queue_limits/inflight
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/net/wlp1s0/queues/tx-3/byte_queue_limits/inflight
/sys/devices/pci0000:00/0000:00:1c.3/0000:02:00.0/rtsx_pci_sdmmc.0/mmc_host/mmc0/mmc0:59b4/block/mmcblk0/inflight
/sys/devices/pci0000:00/0000:00:1c.4/0000:03:00.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1/inflight
/sys/devices/pci0000:00/0000:00:1c.4/0000:03:00.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda2/inflight
/sys/devices/pci0000:00/0000:00:1c.4/0000:03:00.0/ata1/host0/target0:0:0/0:0:0:0/block/sda/inflight
/sys/devices/virtual/net/lo/queues/tx-0/byte_queue_limits/inflight
/sys/devices/virtual/block/dm-0/inflight
/sys/devices/virtual/block/dm-1/inflight
/sys/devices/virtual/block/dm-2/inflight
/sys/devices/virtual/block/dm-3/inflight
/sys/devices/virtual/block/loop0/inflight
/sys/devices/platform/sony-laptop/kbd_backlight
/sys/devices/platform/sony-laptop/kbd_backlight_timeout
/sys/class/backlight
/sys/class/backlight/intel_backlight
/sys/module/video/parameters/use_native_backlight
/sys/module/sony_laptop/parameters/kbd_backlight
/sys/module/sony_laptop/parameters/kbd_backlight_timeout
/sys/module/usbcore/parameters/blinkenlights

sudo find /sys -name '*leds*'                                            
/sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/leds
/sys/class/leds

Last edited by 183.amir (2015-09-02 14:28:30)

183.amir

Member

Registered: 2014-05-15

Posts: 14

Re: Where can I read the backlight sensor values on my laptop

Only usefule links I have found so far is here:
https://github.com/tvogel/vaio-f11-linu … Support.md
Looks like the kernel needs to be patched to work.

Last edited by 183.amir (2015-09-02 15:29:16)