после сброса xorg.conf (командой nvidia-xconfig) отвалилось разрешение
xrandr -q
Screen 0: minimum 320 x 200, current 640 x 480, maximum 8192 x 8192
LVDS-1 connected primary 640x480+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
640x480 59.94*
320x240 60.05
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
lspci -k| grep -EA2 'VGA|3D'
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics Controller
Kernel driver in use: i915
--
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 730M] (rev a1)
Subsystem: Acer Incorporated [ALI] GK107M [GeForce GT 730M]
Kernel driver in use: nvidia
что делать?
Решение: в /etc/X11 есть xorg.conf.nvidia-xconfig-original - его и используем