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Is there any command in ubuntu/linux which can help me in finding out that which card(intel or ATI card) is managing my backlight?

When I looked at sys/class/backlight then I am able to find three different folders/symbolic Links. (acpi_video0,acpi_video1,intel_backlight).

I am new to linux world, so if you think question is too basic then I would appreciate if you could refer me some book/webpage/tutorial where I could update myself quickly.

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    The hard way to do this would be manually editing /sys/class/backlight/acpi_video0/max_brightness , /sys/class/backlight/acpi_video1/max_brightness and /sys/class/backlight/intel_backlight/max_brightness one by one and see which one has effect on system. Also see this wiki for more on changing the values wiki.archlinux.org/index.php/backlight – Stormvirux Mar 23 '14 at 5:48
  • It's usually the intel one BTW. – Amith KK Mar 23 '14 at 6:16
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A possible way to find which card is in charge of managing your backlight is by looking at the full sys/class path of your devices:

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In my case the intel_backlight refers to card0-LVDS-1, where LVDS usually refers to your laptop LCD monitor.

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