Public bug reported: I have been running a stock Ubuntu 16.04 LTS with three monitors from a single Radeon HD 7770 card with no problems.
Description: Ubuntu 16.04.1 LTS Release: 16.04 After not having used my system since approximately 20/12/2016, I used a simple script on 03/01/2017 to run updates then shut down the system as follows: apt-get update apt-get -y dist-upgrade apt-get -y autoremove shutdown -P now Upon next start up, one of my screens remains dark in power saving mode. This screen is connected using a displayport cable. At boot the BIOS splash screen is shown on the affected screen. During the boot process the screen is active until the login screen is presented - at which point the screen enters power saving mode. Using the print screen to capture an image of my desktop, I can see that desktop is active and application windows are being created just fine. The monitor screen in question remains in power saving mode, and is unusable. I tested with an alternate existing install on different hard drive which had also not been updated for some time. I swapped over the hard drive to this machine, let it boot through to a correctly functioning desktop to verify that there was no hardware fault. Once I had verified that the hardware functioned correctly, I again ran updates and rebooted the machine. After update this installation also exhibited the fault. I can only assume that a bug has been introduced during the updates supplied between 20/12/2016 and 03/01/2017. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35 Uname: Linux 4.4.0-57-generic x86_64 .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 BootLog: 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: Sat Jan 7 17:22:02 2017 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde XT [Radeon HD 7770/8760 / R7 250X] [1002:683d] (prog-if 00 [VGA controller]) Subsystem: Micro-Star International Co., Ltd. [MSI] R7770-PMD1GD5 [1462:2710] InstallationDate: Installed on 2016-09-28 (101 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-57-generic.efi.signed root=UUID=d1a7c988-d3b8-474e-ab61-437925f4454e ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/06/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P2.00 dmi.board.name: A75M dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.00:bd07/06/2012:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnA75M:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2 version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2 version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.2 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: Sat Jan 7 16:26:58 2017 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.18.4-0ubuntu0.2 xserver.video_driver: radeon ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1654772 Title: Lost one screen from triple multi monitor radeon setup. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1654772/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs