Same issue to me, my laptop is ASUS A53S, with nVidia Geforce GT 520MX.
Right now I'm using only HDMI connected monitor because the laptop monitor is a
decoupled mirror of the HDMI connected monitor.
Here is xrandr output with HDMI monitor plugged in:
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
VGA-0 connected primary (normal left inverted right x axis y axis)
680x384 60.0 +
1366x768 60.0
1360x768 60.0
LVDS-1-0 connected 1366x768+0+0 344mm x 193mm
1366x768 60.0*+
1360x768 59.8 60.0
1024x768 60.0 60.0
960x720 60.0
928x696 60.1
896x672 60.0
960x600 60.0
960x540 60.0
800x600 60.0 60.3 56.2
840x525 60.0 59.9
800x512 60.2
700x525 60.0
640x512 60.0
720x450 59.9
640x480 60.0 59.9
680x384 59.8 60.0
576x432 60.1
512x384 60.0
400x300 60.3 56.3
320x240 60.1
VGA-1-0 disconnected
HDMI-1-0 connected 1920x1080+0+0 509mm x 286mm
1920x1080 60.0*+ 50.0 59.9
1920x1080i 60.1 50.0 60.0
1680x1050 59.9
1280x1024 75.0 60.0
1440x900 59.9
1280x960 60.0
1280x720 60.0 50.0 59.9
1024x768 75.1 70.1 60.0
832x624 74.6
800x600 72.2 75.0 60.3 56.2
720x576 50.0
720x480 60.0 59.9
640x480 75.0 72.8 66.7 60.0 59.9
720x400 70.1
DisplayPort-1-0 disconnected
1366x768 (0x46) 71.8MHz
h: width 1366 start 1414 end 1446 total 1526 skew 0 clock 47.1KHz
v: height 768 start 771 end 777 total 784 clock 60.0Hz
1360x768 (0x48) 72.0MHz
h: width 1360 start 1408 end 1440 total 1520 skew 0 clock 47.4KHz
v: height 768 start 771 end 781 total 790 clock 60.0Hz
680x384 (0x5c) 36.0MHz
h: width 680 start 704 end 720 total 760 skew 0 clock 47.4KHz
v: height 384 start 385 end 390 total 395 clock 60.0Hz
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https://bugs.launchpad.net/bugs/1296020
Title:
[Asus U36JC] Non-existent display detected in both intel driver and
nvidia driver (Optimus Laptop) (ubuntu trusty 14.04)
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