Asus GTX 650, монитор Asus VW199 (DVI). Это какято вселенская проблема, на xubuntu 14.04 всё сохранялось. А именно разрешение, развёртка и opengl качество.
Удалаял xorg.conf, создавал с помощью nvidia-xconfig, c помощью X -configure а потом из nvidia-settings с правами sudo сохранял в него - НИЧЕГО. LightDM.
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xorg.conf
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 343.13 (buildd@lgw01-30) Mon Aug 11 19:50:14 UTC 2014
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Ancor Communications Inc ASUS VW199"
HorizSync 30.0 - 83.0
VertRefresh 55.0 - 75.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 650"
EndSection
Section "Screen"
# Removed Option "nvidiaXineramaInfoOrder" "CRT-0"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-1"
Option "metamodes" "1440x900_75 +0+0"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
SubSection "Display"
Depth 24
EndSubSection
EndSection