@mitu
yeah, it's optimus. Here is the output

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384 DP-0 disconnected (normal left inverted right x axis y axis) DP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 800mm x 450mm 3840x2160 30.00 + 29.97 23.98 4096x2160 29.97 24.00 23.98 1920x1080 60.00* 59.94 29.97 23.98 1680x1050 59.95 1440x900 59.89 1360x768 60.02 1280x1024 75.02 60.02 1280x960 60.00 1280x800 59.81 1280x720 60.00 59.94 29.97 23.97 1152x864 75.00 1024x768 75.03 70.07 60.00 800x600 75.00 72.19 60.32 720x480 59.94 640x480 75.00 72.81 59.94 59.93 LVDS-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 382mm x 215mm 1920x1080 60.01*+ 60.01 59.97 59.96 59.93 1680x1050 59.95 59.88 1600x1024 60.17 1400x1050 59.98 1600x900 59.99 59.94 59.95 59.82 1280x1024 60.02 1440x900 59.89 1400x900 59.96 59.88 1280x960 60.00 1440x810 60.00 59.97 1368x768 59.88 59.85 1360x768 59.80 59.96 1280x800 59.99 59.97 59.81 59.91 1152x864 60.00 1280x720 60.00 59.99 59.86 59.74 1024x768 60.04 60.00 960x720 60.00 928x696 60.05 896x672 60.01 1024x576 59.95 59.96 59.90 59.82 960x600 59.93 60.00 960x540 59.96 59.99 59.63 59.82 800x600 60.00 60.32 56.25 840x525 60.01 59.88 864x486 59.92 59.57 800x512 60.17 700x525 59.98 800x450 59.95 59.82 640x512 60.02 720x450 59.89 700x450 59.96 59.88 640x480 60.00 59.94 720x405 59.51 58.99 684x384 59.88 59.85 680x384 59.80 59.96 640x400 59.88 59.98 576x432 60.06 640x360 59.86 59.83 59.84 59.32 512x384 60.00 512x288 60.00 59.92 480x270 59.63 59.82 400x300 60.32 56.34 432x243 59.92 59.57 320x240 60.05 360x202 59.51 59.13 320x180 59.84 59.32 VGA-1-1 disconnected (normal left inverted right x axis y axis) HDMI-1-1 disconnected (normal left inverted right x axis y axis) DP-1-1 disconnected (normal left inverted right x axis y axis) HDMI-1-2 disconnected (normal left inverted right x axis y axis) HDMI-1-3 disconnected (normal left inverted right x axis y axis) DP-1-2 disconnected (normal left inverted right x axis y axis) DP-1-3 disconnected (normal left inverted right x axis y axis) 1680x1050 (0x50) 146.250MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz 1280x1024 (0x58) 108.000MHz +HSync +VSync h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz 1440x900 (0x59) 106.500MHz -HSync +VSync h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.93KHz v: height 900 start 903 end 909 total 934 clock 59.89Hz 1280x960 (0x5c) 108.000MHz +HSync +VSync h: width 1280 start 1376 end 1488 total 1800 skew 0 clock 60.00KHz v: height 960 start 961 end 964 total 1000 clock 60.00Hz 1280x800 (0x65) 83.500MHz -HSync +VSync h: width 1280 start 1352 end 1480 total 1680 skew 0 clock 49.70KHz v: height 800 start 803 end 809 total 831 clock 59.81Hz 1024x768 (0x6d) 65.000MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz v: height 768 start 771 end 777 total 806 clock 60.00Hz 800x600 (0x7c) 40.000MHz +HSync +VSync h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz v: height 600 start 601 end 605 total 628 clock 60.32Hz 640x480 (0x8b) 25.175MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz v: height 480 start 490 end 492 total 525 clock 59.94Hz

Ubuntu install issues