I have an external monitor connected thru an hdmi port to the dvi input of an external monitor. The monitor never gets detected. I run ubuntu 17.1 with intel video drivers; lspci -v finds:
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07) (prog-if 00 [VGA controller]) Subsystem: Toshiba America Info Systems HD Graphics 520 Flags: bus master, fast devsel, latency 0, IRQ 126 Memory at c0000000 (64-bit, non-prefetchable) [size=16M] Memory at b0000000 (64-bit, prefetchable) [size=256M] I/O ports at 3000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915
The monitor is a samsung mega model BX2335, laptop is a toshiba tecra-z40-c, kernel is 4.13.0-32-generic. xrandr shows:
jeremy@jeremy-TECRA-Z40-C-pipl:~/Downloads$ xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192 eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm 1920x1080 60.02*+ 59.93 1680x1050 59.95 59.88 ....<a bunch of resolutions>.... 320x240 60.05 DP-1 disconnected (normal left inverted right x axis y axis) HDMI-1 disconnected (normal left inverted right x axis y axis) DP-2 disconnected (normal left inverted right x axis y axis) HDMI-2 disconnected (normal left inverted right x axis y axis)
That first screen is the laptop screen. The xorg.conf looks ok afaict:
jeremy@jeremy-TECRA-Z40-C-pipl:~/Downloads$ more /usr/share/doc/xserver-xorg-video-intel/xorg.conf Section "Device" Identifier "Intel" Driver "intel" # Option "AccelMethod" "uxa" EndSection
The monitors control panel doesn’t detect the external monitor. I've rebooted, run apt update, upgrade, and dist-upgrade, and tried the driver upgrades (none were found and I didn’t force anything) .