Please attach your /var/log/Xorg.0.log when it chooses to use 16bit.
** Changed in: xserver-xorg-video-nv (Ubuntu)
Sourcepackagename: xorg => xserver-xorg-video-nv
** Changed in: xserver-xorg-video-nv (Ubuntu)
Status: New => Incomplete
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Default 16bit color depth on nVidia Quadro 140
https://bugs.launchpad.net/bugs/219957
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