Unable to adjust brightness Macbook Pro

[elcid]

New linux user here. I goto to system settings brightness and lock and see no setting to adjust brightness. xbacklight -set does nothing. I can adjust keyboard backlight and volume with function keys just fine but brightness keys (f1 - f2) do absolutely nothing. Getting a bit frustrated after spending so much time getting wifi and bluetooth to work. I'm not sure anymore if this OS is really worth the hassle. Please help.

[elcid]

lspci | grep VGA

04:00.0 VGA compatible controller: NVIDIA Corporation Device 08a0 (rev a2)

xrandr

xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1280 x 800, current 1280 x 800, maximum 1280 x 800
default connected 1280x800+0+0 0mm x 0mm
1280x800 76.0*

I've updated drivers, searched and ran multiple solutions and I still can not adjust gamma. Anyone please?

[elcid]

glxinfo
name of display: :0.0
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Error: couldn't find RGB GLX visual or fbconfig

Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".
Xlib: extension "GLX" missing on display ":0.0".


How can I fix this?