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Ubuntu 16.04 (xenial) reached end-of-standard-support on April 29, 2021. I'm setting the status of this bug to 'Incomplete' as it's not seen any activity for some time. If this is still an issue when using a currently maintained release of Ubuntu then please let us know which one(s) otherwise this bug report can be left to expire in approximately 60 days time. ** Changed in: xorg (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1664501 Title: Unable to wake up monitor after it goes to sleep (after locking x session, for example) Status in xorg package in Ubuntu: Incomplete Bug description: Additional info: lsb_release: Description: Ubuntu 16.04.1 LTS Release: 16.04 I'm using an external monitor attached via VGA (seen as DP2 in xrandr output) in an extended desktop configuration (not cloned). Whenever the X session starts some kind of screen saving (for example, after locking the screen), the external monitor and the laptop screen both go to a saving power state. After that, If I try to wake them up (moving cursor, touch keys, etc.), only the laptop's panel goes back. The external monitor stays in a suspended state. If I force it to wake up and scan inputs, it doesn't find any, and it doesn't appear as conencted in xrandr otput. The only way I've found to wake it up is by performing the following sequence of operations: ALT+F1 [switch to first tty/console] --> this does wake up and activate the monitor, mirroring login as my user $ xrandr -d :0 #DP2 still doesn't appear logout ALT+F7 [go back to X] At this point, the external monitor is working and X detects it and re-enables the extended desktop Doing just ALT+F1/ALT+F7, doesn't work (I need to execute xrandr in order to make the whole thing work) Doing xrandr from the graphical environment (directly in a xterminal in the Xsession) doesn't wake up the monitor Looks like there's no need to add any addictional operation/parameter to xrandr in order to make this process work, no need to set output settings, etc. Just issue "xrandr -d :0" and things magically work Thanks in advance ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40 Uname: Linux 4.4.0-62-generic x86_64 NonfreeKernelModules: zfs zunicode zcommon znvpair zavl .tmp.unity_support_test.0: ApportVersion: 2.20.1-0ubuntu2.5 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: Tue Feb 14 10:54:19 2017 DistUpgraded: Fresh install DistroCodename: xenial DistroVariant: ubuntu ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation Sky Lake Integrated Graphics [8086:1916] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Skylake Integrated Graphics [103c:8079] MachineType: HP HP EliteBook 840 G3 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-62-generic root=ZFS=rpool/ROOT/ubuntu ro boot=zfs quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/22/2016 dmi.bios.vendor: HP dmi.bios.version: N75 Ver. 01.05 dmi.board.name: 8079 dmi.board.vendor: HP dmi.board.version: KBC Version 85.61 dmi.chassis.asset.tag: 5CG6247TWJ dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrN75Ver.01.05:bd03/22/2016:svnHP:pnHPEliteBook840G3:pvr:rvnHP:rn8079:rvrKBCVersion85.61:cvnHP:ct10:cvr: dmi.product.name: HP EliteBook 840 G3 dmi.sys.vendor: HP 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: Tue Feb 14 10:49:09 2017 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 5312 vendor CMN xserver.version: 2:1.18.4-0ubuntu0.2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1664501/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp