Same issue with my laptop. After fresh 16.04 install laptop's display
active but blank.
# lshw -c video
*-display
description: VGA compatible controller
product: Trinity [Radeon HD 7640G]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:39 memory:c0000000-cfffffff ioport:5000(size=256)
memory:d6000000-d603ffff
# xrandr
Screen 0: minimum 320 x 200, current 1440 x 900, maximum 16384 x 16384
LVDS connected (normal left inverted right x axis y axis)
1366x768 59.99 + 40.00
1280x720 59.86
1152x768 59.78
1024x768 59.92
800x600 59.86
848x480 59.66
720x480 59.71
640x480 59.38
VGA-0 connected primary 1440x900+0+0 (normal left inverted right x axis y axis)
408mm x 255mm
1440x900 59.89*+ 74.98
1280x1024 75.02 60.02
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08
HDMI-0 disconnected (normal left inverted right x axis y axis)
I suppose this issue related to radeon driver, because on my previous
installation(Ubuntu 14.04, fglrx driver) all worked fine.
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https://bugs.launchpad.net/bugs/1530695
Title:
laptop LVDS screen blanks if external VGA display connected
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