purged everything, am now giving it a try with:
sudo aptitude install nvidia-319 nvidia-prime nvidia-common nvidia-
settings-319
xorg.conf now reads:
# Warning: This file is autogenerated by nvidia-prime. All changes to
this file will be lost.
Section "ServerLayout"
Identifier "layout"
Screen 0 "nvidia"
Inactive "intel"
EndSection
Section "Device"
Identifier "nvidia"
Driver "nvidia"
BusID "1:0:0"
EndSection
Section "Screen"
Identifier "nvidia"
Device "nvidia"
# Uncomment this line if your computer has no display devices connected to
# the NVIDIA GPU. Leave it commented if you have display devices
# connected to the NVIDIA GPU that you would like to use.
Option "UseDisplayDevice" "none"
EndSection
Section "Device"
Identifier "intel"
Driver "modesetting"
EndSection
Section "Screen"
Identifier "intel"
Device "intel"
EndSection
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https://bugs.launchpad.net/bugs/1207626
Title:
Hybrid graphics doesn't work with pci classes other than 300
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