Public bug reported: I think the exact same thing happened with the previous upgrade.
I have a laptop and I often connect an external monitor. I had it set up so that when I connect it, the laptop's builtin display turns off and the external one works as the only display. I upgraded from 15.10 to 16.04, and the screen configuration was lost. When I connected the external monitor, the two displays were working as extended desktop (or whatever is called). I had to set up the displays again. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30 Uname: Linux 4.4.0-53-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0' .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.98 Mon Sep 19 17:31:03 PDT 2016 GCC version: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.2 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 Dec 11 23:17:37 2016 DistUpgraded: 2016-12-11 22:45:13,519 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process "./xorg_fix_proprietary.py" (No such file or directory) (8)) DistroCodename: xenial DistroVariant: ubuntu DkmsStatus: bbswitch, 0.8, 4.2.0-42-generic, x86_64: installed bbswitch, 0.8, 4.4.0-53-generic, x86_64: installed nvidia-340, 340.98, 4.2.0-42-generic, x86_64: installed nvidia-340, 340.98, 4.4.0-53-generic, x86_64: installed vboxhost, 4.3.14: added ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics Controller [1025:0647] NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] [10de:1140] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0691] InstallationDate: Installed on 2013-10-11 (1157 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: Acer Aspire V3-571G ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-53-generic.efi.signed root=UUID=5830b30e-69e8-4bb4-8a2b-bc2b43c7414a ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: Upgraded to xenial on 2016-12-11 (0 days ago) dmi.bios.date: 10/15/2012 dmi.bios.vendor: Acer dmi.bios.version: V2.07 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: VA50_HC_CR dmi.board.vendor: Acer dmi.board.version: Type2 - Board Version dmi.chassis.type: 10 dmi.chassis.vendor: Acer dmi.chassis.version: V2.07 dmi.modalias: dmi:bvnAcer:bvrV2.07:bd10/15/2012:svnAcer:pnAspireV3-571G:pvrV2.07:rvnAcer:rnVA50_HC_CR:rvrType2-BoardVersion:cvnAcer:ct10:cvrV2.07: dmi.product.name: Aspire V3-571G dmi.product.version: V2.07 dmi.sys.vendor: Acer 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.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A 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: Sun Dec 11 23:09:33 2016 xserver.configfile: /etc/X11/xorg.conf xserver.errors: NVIDIA(0): Failed to initiate mode change. NVIDIA(0): Failed to complete mode change xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.18.4-0ubuntu0.2 ** 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-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1649154 Title: distribution upgrade wiped screen settings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1649154/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp