For the brightness problem, the nvidia proprietary driver requires an
xorg.conf option to work (it shipped with this when it was enabled)
Section "Device"
Identifier "Default Device"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
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https://bugs.launchpad.net/bugs/773716
Title:
[Lenovo T420s] function keys and other things don't work after sleep
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