failed to load/save screen backlight kali live boot

Hello guys
actually i have annoying problem with booting kali.
first of all my system information is:
amd a10 CPU
amd r7 m295 + amd r7 512mb (dual graphic)
1 tb hdd
i try to boot kali in live mood but when i hit enter to boot kali live after preparing to boot it show me 2 fail log massage
failed to load/save screen backlight acpi_video.0
failed to load/save screen backlight acpi_video.1
and then it shows black screen (some times it boot kali live but after i move the mouse cruiser screen go black again (Full black screen with out any object)
i try every solutions in the net like
GRUB_CMDLINE_LINUX_DEFAULT=“quiet acpi_osi="!Windows 2012"
GRUB_CMDLINE_LINUX_DEFAULT=“quiet acpi_backlight=vendor”
but it doesn't work
mention:please if you guys send a code like this GRUB_CMDLINE_LINUX_DEFAULT=“quiet acpi_backlight=vendor” please give a little instruction to how i use it in grub boot menu!
thanks Blackat