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I have a laptop (HP 6730b) with an external monitor. It worked fine on Ubuntu 12.04. But on Ubuntu 17.10 both monitors are black with flickering if I try to startup using Xorg. It works with either monitor but not both at once.

It does work with both at the same time using Wayland. But Wayland is very unstable for me and the computer freezes frequently after a while with the hdd working a lot. Mostly with Firefox or Atom which is quite heavy applications. Most of the time I can't even switch to text console ctrl-alt-F5.

Any way I can have it working with both monitors at the same time using Xorg as before?!

$ xrandr Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192 LVDS-1 connected (normal left inverted right x axis y axis) 1680x1050 60.01 + 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
VGA-1 disconnected (normal left inverted right x axis y axis) HDMI-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm 1920x1200 59.95*+ 1600x1200 60.00
1280x1024 75.02 60.02
1152x864 75.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
DP-1 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) SVIDEO-1 disconnected (normal left inverted right x axis y axis)

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