$ ls /sys/class/backlight
intel_backlight

$ grep -r . /proc/acpi > acpi 
/proc/acpi/button/lid/LID0/state:state:      open
/proc/acpi/wakeup:Device        S-state   Status   Sysfs node
/proc/acpi/wakeup:P0P1    S4    *disabled
/proc/acpi/wakeup:USB1    S3    *disabled
/proc/acpi/wakeup:USB2    S3    *disabled
/proc/acpi/wakeup:USB3    S3    *disabled
/proc/acpi/wakeup:USB4    S3    *disabled
/proc/acpi/wakeup:USB5    S3    *disabled
/proc/acpi/wakeup:USB6    S3    *disabled
/proc/acpi/wakeup:USB7    S3    *disabled
/proc/acpi/wakeup:RP01    S4    *disabled  pci:0000:00:1c.0
/proc/acpi/wakeup:RP04    S4    *disabled  pci:0000:00:1c.3
/proc/acpi/wakeup:PEG0    S4    *disabled  pci:0000:00:01.0
/proc/acpi/wakeup:PEGP    S4    *disabled  pci:0000:01:00.0
/proc/acpi/wakeup:PEGA    S4    *disabled
/proc/acpi/wakeup:PEG1    S4    *disabled
/proc/acpi/wakeup:PEG2    S4    *disabled
/proc/acpi/wakeup:PEG3    S4    *disabled
/proc/acpi/wakeup:PWRB    S5    *enabled   platform:PNP0C0C:00

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https://bugs.launchpad.net/bugs/1380824

Title:
  Backlight not working on Samsung ATIV 8 laptop

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