https://bugs.freedesktop.org/show_bug.cgi?id=99784
--- Comment #14 from Valeriu Balaban <vbala...@usc.edu> ---
Created attachment 131429
--> https://bugs.freedesktop.org/attachment.cgi?id=131429&action=edit
Output of xrandr and dmesg
I have the same issue on Ubuntu 16.04 LTS with Mate desktop that runs on an
iMac 11. The second monitor is connected through a Display Port to VGA adapter
and the kernel selects it to be primary by default.
After a fresh boot, since the second monitor is the primary one it contains the
login screen, however the screen is black. So I have to unplug it to make the
internal monitor (eDP) primary. If I plug again the external one, the internal
monitor turns black and the external becomes active and starts to display it's
content.
If I take a screenshot, I can see what is displayed on both monitors.
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