Proper way to fix screen brightness

[argentuM]

I have a lenovo g50-45 amd a8 processor. I just cannot decrease or increase the screen brightness. My eyes start to hurt.
I have seen a lot of solutions like specifying acpi_backlight=vendor acpi_osi=!Windows etc, but none of which seem to work in my case when I append them to the lilo.conf.
I have checked the files in /sys/class/backlight/ideapad , the actual and brightness is 2 and max is 21. decreasing the values, no effect.
When i typed

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xbacklight -20

I got the output as No outputs have backlight property, and I have no idea how to fix it.

[gapan]

I have seen a lot of solutions like specifying acpi_backlight=vendor acpi_osi=!Windows etc, but none of which seem to work in my case when I append them to the lilo.conf.

Did you actually run lilo?

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sudo lilo -v

Otherwise your edits in lilo.conf don't matter.

[argentuM]

Yes, obviously i ran thecommand.

[gapan]

OK, let's start with what video card you have then. Post the output of

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sudo lspci