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This worked with much fiddling on 15.10, but since upgrading to 16.04, I can't get the 2nd monitor working at all.

xrandr -q

Reports "HDMI1 disconnected" though it isn't.

With open source drivers, only the primary notebook monitor works, and with nVidia proprietary drivers, X can't boot at all.

Maybe a good config of xorg.conf could fix it, but I'm no expert at that. Anyway, has anybody found a fix for Dell 3543, or does anyone at least have some clue where to begin fixing it?

Ivan Čurdinjaković
  • 673

1 Answers1

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Further investigation revealed that in kernel 4.4, i915 driver has a regression... It's not fixed yet, but this workaround is good:

/etc/default/grub

edit

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"Linux\" video=HDMI-A-1:e"

(video=HDMI-A-1:e being the workaround...) And don't forget to 

sudo update-grub2

After reboot, HDMI port is visible to the system, and 2nd monitor works.

Ivan Čurdinjaković
  • 673