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I have a notebook with Ubuntu, connect 1st monitor on HDMI to it and second one by docking station via USB. My second monitor is connected with docking station and station by USB with laptop.
And now I have a screen on notebook and 1st monitor (by HDMI), but second one monitor is disabled even if I can see it in screen settings as Unknown.
I used xrandr and it shows this one:

Screen 0: minimum 320 x 200, current 4310 x 1080, maximum 8192 x 8192

LVDS-1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm

1366x768 60.01*+

1360x768 59.80 59.96 

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 disconnected (normal left inverted right x axis y axis)

HDMI-1 connected primary 1920x1080+1366+0 (normal left inverted right x axis y axis) 528mm x 297mm

1920x1080 60.00*+ 50.00 59.94 

1920x1080i 60.00 50.00 59.94 

1680x1050 59.88 

1600x900 60.00 

1280x1024 60.02 

1280x800 59.91 

1280x720 60.00 50.00 59.94 

1024x768 60.00 

800x600 60.32 

720x576 50.00 

720x576i 50.00 

720x480 60.00 59.94 

720x480i 60.00 59.94 

640x480 60.00 59.94 

720x400 70.08 

DP-1 disconnected (normal left inverted right x axis y axis)

VGA-1-2 connected 1024x768+3286+0 (normal left inverted right x axis y axis) 0mm x 0mm

1024x768 60.00* 

800x600 60.32 56.25 

848x480 60.00 

640x480 59.94 

1024x768 (0x43) 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 (0x44) 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

800x600 (0x45) 36.000MHz +HSync +VSync

h: width 800 start 824 end 896 total 1024 skew 0 clock 35.16KHz

v: height 600 start 601 end 603 total 625 clock 56.25Hz

640x480 (0x47) 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

Anyone have an idea how to enable 2nd monitor via docking station?