Going back to your JournalErrors.txt:
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0):
Page flip failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (EE) RADEON(0):
present flip failed
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0):
flip queue failed: Invalid argument
I would like to verify if those errors correlate with the problem. Can
you please run:
journalctl -f
and see if those errors only occur when trying to drive 3 monitors?
Do the errors go away when only 2 monitors are plugged in?
** Also affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1725836
Title:
No more than 2 displays work simultaneously
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