Public bug reported:
Upgrading from UbuntuStudio 15.10 to 16.04, my 2nd display is a no more
a 1st display extension and only a clone. xrand detects only one
display.
$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1400 x 1050, current 1400 x 1050, maximum 1400 x 1050
default connected 1400x1050+0+0 0mm x 0mm
1400x1050 77.00*
$ lspci -nn | grep VGA
00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Sumo [Radeon HD 6410D] [1002:9644]
$ 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!
$ uname -r
4.4.0-21-lowlatency
$
Seems same than bug 1407505, but apport-bug failed, so I created a new
bug.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-21.37-lowlatency 4.4.6
Uname: Linux 4.4.0-21-lowlatency x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Apr 29 23:19:49 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-08-21 (252 days ago)
InstallationMedia: Ubuntu-Studio 15.04 "Vivid Vervet" - Release amd64 (20150422)
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to xenial on 2016-04-24 (5 days ago)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolution xenial
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1576864
Title:
No UMS support in radeon module
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