echo 2000 | sudo tee /sys/class/backlight/intel_backlight/brightness

sudo gedit /etc/default/grub

GRUB_CMDLINE_LINUX="quiet splash"

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

sudo update-grub

fglrxinfo - show incorrect information about my video card, driver (from official AMD site) is installed, but really not working, video acceleration too not working, windows in gnome environment have lags.

fglrxinfo - show incorrect information about my video card, driver (from official AMD site) is installed, but really not working, video acceleration too not working, windows in gnome environment have lags.