[nvidia] On resume, a black screen delays login screen

[Sidney Lins]

Every time I suspend the notebook (close lid, not sure about suspension by command) when I unsuspend (open lid) a long time black screen with only mouse pointer visible delays the login screen to display (about 10~15 seconds of delaying). The mouse pointer works but with brief freezings when moving, something like 0,5s of freezing for each 1,5s moving.

This notebook is a i7 16GB ram 120GB SSD so it should never happen, in fact, it never happened in Deepin Linux or even Ubuntu 16.04.

I will be available to provide some other information you need.
Thanks.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] É um diretório: '/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 390.42 Sat Mar 3 04:10:22 PST 2018
 GCC version: gcc version 7.3.0 (Ubuntu 7.3.0-11ubuntu1)
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
BootLog: Error: [Errno 13] Permissão negada: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat Mar 24 12:26:54 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 390.42, 4.15.0-12-generic, x86_64: installed
 virtualbox, 5.2.8, 4.15.0-12-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation HD Graphics 530 [8086:191b] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Toshiba America Info Systems HD Graphics 530 [1179:f840]
InstallationDate: Installed on 2018-03-09 (14 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180309)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 009: ID 04f2:b446 Chicony Electronics Co., Ltd
 Bus 001 Device 003: ID 248a:8366
 Bus 001 Device 002: ID 04f3:2228 Elan Microelectronics Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: TOSHIBA Satellite S55t-C
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-12-generic root=UUID=62fa4fcd-f1c6-43f5-a86d-ccaae2565dac ro locale=pt_BR quiet splash vt.handoff=1
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/08/2015
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 1.20
dmi.board.name: 06F4
dmi.board.vendor: FF50
dmi.board.version: Type2 - Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis ManuFacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: dmi:bvnINSYDECorp.:bvr1.20:bd10/08/2015:svnTOSHIBA:pnSatelliteS55t-C:pvrPSPUGU-00200D:rvnFF50:rn06F4:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
dmi.product.family: Type1Family
dmi.product.name: Satellite S55t-C
dmi.product.version: PSPUGU-00200D
dmi.sys.vendor: TOSHIBA
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.91-2
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc5-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2