second monitor connected via VGA port. im not sure how to solve this issue. this same dual display setup is work just fine on windows.
my inxi -Gx and xrandr -q
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inxi -Gx
Graphics: Card-1: Advanced Micro Devices [AMD/ATI] Kaveri [Radeon R7 Graphics]
bus-ID: 00:01.0
Card-2: Advanced Micro Devices [AMD/ATI] Jet PRO [Radeon R5 M230]
bus-ID: 01:00.0
Display Server: X.Org 1.18.4 drivers: ati,radeon (unloaded: fbdev,vesa)
Resolution: 1366x768@59.79hz, 1366x768@60.00hz
GLX Renderer: AMD KAVERI (DRM 2.49.0 / 4.10.0-37-generic, LLVM 5.0.0)
GLX Version: 3.0 Mesa 17.3.0-rc1 - padoka PPA Direct Rendering: Yes
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xrandr -q
Screen 0: minimum 320 x 200, current 2732 x 768, maximum 16384 x 16384
VGA-0 connected 1366x768+0+0 (normal left inverted right x axis y axis) 410mm x 230mm
1366x768 59.79*+
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 59.94
720x400 70.08
HDMI-0 disconnected (normal left inverted right x axis y axis)
eDP connected primary 1366x768+1366+0 (normal left inverted right x axis y axis) 345mm x 194mm
1366x768 60.00*+
1280x720 59.97
1152x768 59.95
1024x768 59.95
800x600 59.96
848x480 59.94
720x480 59.94
640x480 59.94