It sounds like this problem may be limited to Wayland sessions (which
includes the login screen). Please try this workaround next time you
install 18.04:
Ctrl+Alt+F4, log in, edit /etc/gdm3/custom.conf and uncomment the line:
#WaylandEnable=false
Then reboot.
** Tags added: multi-monit radeon
** Tags removed: multi-monit
** Tags added: multi-monitor
** Summary changed:
- dual monitor not working in 18.04(.1)
+ Dual monitor not working in 18.04(.1) on a dual-radeon-GPU system
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1792822
Title:
Dual monitor not working in 18.04(.1) on a dual-radeon-GPU system
Status in mutter package in Ubuntu:
Incomplete
Bug description:
Dual monitor setup works fine in 16.04 LTS. Not anymore in 18.04(.1).
This renders 18.04 useless. Till this is solved will have to stick
with 16.04. i.e. this is a pretty critical bug!
After a fresh install from DVD first got a freeze on login screen (live CD
will run ubuntu though!). This could be solved by switching to lightdm display
manager. (Boo! for GDM that cannot even show a login screen without freezing
the system)
But one issue remains: the dual monitor setup will not work in 18.04.
I can see the mouse move to the second monitor. I can drag windows
there (and lose sight of them). I can see the mouse cursor change to
click a link. But otherwise there is a completely black screen, or
dots / colored fields, but nothing even resembling a program.
MB: Gigabyte GA-A75M-UD2H
Monitor that works fine: ASUS on Radeon HD 6550D
monitor that only shows mouse cursor: benq on Radeon HD 4870 (onboard on the
gigabyte motherboard)
Note: dual monitor setup did not work with other upgrades after 16.04. I
hoped this would be solved with the next LTS update. Not so, to great
disappointment!
Ubuntu really fails if with new major updates it makes systems fall down.
This kind of thing should work FLAWLESS out of the box! How would anyone move
to Ubuntu when this kind of thing does not work? Windows is a drama, but at
least it has the mere basics working!
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3.1
ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
Uname: Linux 4.4.0-135-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CompizPlugins: No value set for
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sun Sep 16 23:09:31 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
virtualbox, 5.0.40, 4.4.0-133-generic, x86_64: installed
virtualbox, 5.0.40, 4.4.0-134-generic, x86_64: installed
virtualbox, 5.0.40, 4.4.0-135-generic, x86_64: installed
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek [Radeon HD 6550D]
[1002:9640] (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd BeaverCreek [Radeon HD 6550D]
[1458:d000]
Advanced Micro Devices, Inc. [AMD/ATI] RV770 [Radeon HD 4870] [1002:9440]
(prog-if 00 [VGA controller])
Subsystem: PC Partner Limited / Sapphire Technology RV770 [Radeon HD 4870]
[174b:0851]
InstallationDate: Installed on 2016-10-02 (714 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
MachineType: Gigabyte Technology Co., Ltd. GA-A75M-UD2H
ProcEnviron:
LANGUAGE=nl_NL
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=nl_NL.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-135-generic
root=UUID=a5b3b47d-aa17-4b49-ba9a-eeaefc2556d6 ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/17/2011
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F6c
dmi.board.name: GA-A75M-UD2H
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrF6c:bd11/17/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-A75M-UD2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-A75M-UD2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-A75M-UD2H
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.91-2~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
1:1.0.12-1build2
xserver.bootTime: Sun Sep 16 19:34:47 2018
xserver.configfile: default
xserver.errors: RADEON(G0): [XvMC] Failed to initialize extension.
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.4-0ubuntu0.8
xserver.video_driver: radeon
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