Thank you for reporting this bug to Ubuntu. Ubuntu 15.10 (wily) reached end-of-life on July 28, 2016.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed. ** Changed in: xorg (Ubuntu) Status: Incomplete => Won't Fix -- 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/1493921 Title: X server fails to set correct mode on resume from sleep (NVIDIA: Setting a mode on head 0 failed: An invalid mode was requested) Status in xorg package in Ubuntu: Won't Fix Bug description: Using a really picky Dell P2415Q monitor through DP->mDP (displayport -> mini displayport) cable, nvidia binary driver version 352.30-0ubuntu1. This is not a laptop, so the Intel integrated VGA is disabled. (No other cards in sysfs.) Really nasty bug, as every time all the running applications detect that the X server went away and exit, logind terminates the session culling everyone, and so on. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0 Uname: Linux 4.2.0-7-generic x86_64 NonfreeKernelModules: nvidia .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 352.30 Tue Jul 21 18:53:45 PDT 2015 GCC version: gcc version 5.2.1 20150825 (Ubuntu 5.2.1-15ubuntu5) ApportVersion: 2.18-0ubuntu9 Architecture: amd64 Date: Wed Sep 9 17:56:53 2015 DistUpgraded: 2014-08-06 01:18:55,244 DEBUG enabling apt cron job DistroCodename: wily DistroVariant: ubuntu GraphicsCard: NVIDIA Corporation GK104 [GeForce GTX 760] [10de:1187] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Gigabyte Technology Co., Ltd Device [1458:3614] MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-7-generic root=UUID=fba348ec-fc7c-4c7f-b78b-026be76c4568 ro crashkernel=384M-:128M crashkernel=384M-:128M SourcePackage: xorg UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: Upgraded to wily on 2014-08-05 (399 days ago) dmi.bios.date: 10/24/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F18 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: Z77X-UD3H dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF18:bd10/24/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77X-UD3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.: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: Gigabyte Technology Co., Ltd. version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.64-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.6.3-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.6.3-1ubuntu1 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu5 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3 xserver.bootTime: Wed Sep 9 15:10:08 2015 xserver.configfile: default xserver.devices: input Power Button KEYBOARD, id 6 input Power Button KEYBOARD, id 7 input Logitech G100s Optical Gaming Mouse MOUSE, id 8 input AT Translated Set 2 keyboard KEYBOARD, id 9 xserver.errors: open /dev/fb0: No such file or directory xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.17.2-1ubuntu5 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1493921/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

