Just docked my laptop and woke it up from sleep and it detected the two
monitors.
This was either fixed in the latest kernel or after I disabled polling
in drm_kms_helper:
echo N > /sys/module/drm_kms_helper/parameters/poll
I put it into /etc/rc.local to make it permanent.
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: New => Fix Released
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which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/999141
Title:
Dual monitor DisplayPort stopped working.
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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/999141/+subscriptions
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