Same problem for me upgrading from 15.10 to 16.04:
$ dmesg | egrep 'drm|radeon'
[ 1.293303] [drm] Initialized drm 1.1.0 20060810
[ 1.328085] [drm] VGACON disable radeon kernel modesetting.
[ 1.328109] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon
module!
[ 12.801460] [drm] VGACON disable radeon kernel modesetting.
[ 12.801484] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon
module!
$ lspci -nn | grep VGA
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Sumo [Radeon HD 6410D] [1002:9644]
baobab:~/sw/amd$ uname -r
4.4.0-21-lowlatency
$ apport-collect 1407505
/usr/share/apport/apport-gtk:16: PyGIWarning: Wnck was imported without
specifying a version first. Use gi.require_version('Wnck', '3.0') before import
to ensure that the right version gets loaded.
from gi.repository import GLib, Wnck, GdkX11, Gdk
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
$
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https://bugs.launchpad.net/bugs/1407505
Title:
No UMS support in radeon module
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