in /etc/default/grub at made the following changes (one at a time)
1.acpi_osi=
2.acpi_osi=Linux
3.acpi_backlight=vendor
4.acpi_osi= acpi=force
5.acpi_osi=Linux acpi=force
6.acpi_backlight=vendor acpi=force
with sudo update-grub and rebooting after each change but nothing happened.
Then i changed it to acpi_osi=
and removed the # from
echo 1000 > /sys/class/backlight/intel_backlight/brightness
in /etc/rc.local file and updated grub and after rebooting the brightness would remain low as long as i do not use the keyboard shortcut for changing the brightness. Once i do so, it jumps to maximum and then can be brought down only by abt 10%. But from system settings > Brightness & Lock i can use the slider to reduce the brightness.
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