My system does not wake from suspend. Suspending seems to work correctly, but
when I press the power button to wake, the screens of the system stay black. I
could ping the system, but not log in by ssh.

I'm using the nouveau driver, with the nvidia driver the system did wake up
correctly.

See the following bug report for more details about my setup:
https://bugzilla.redhat.com/show_bug.cgi?id=1491565

In summary:
Graphics:  Card: NVIDIA GP107 [GeForce GTX 1050 Ti]
           Display Server: X.org 1.19.5 drivers: modesetting,fbdev,vesa
           tty size: 80x24 Advanced Data: N/A for root

System:    Host: nyx Kernel: 4.14.11-300.fc27.x86_64 x86_64 bits: 64 gcc: 7.2.1
Console: tty 0
           Distro: Fedora release 27 (Twenty Seven)

Machine:   Device: desktop System: Micro-Star product: MS-7A34 v: 2.0 serial:
N/A
           Mobo: Micro-Star model: B350 PC MATE (MS-7A34) v: 2.0 serial:
H416624391
           UEFI: American Megatrends v: A.73 date: 09/11/2017

Log messages when suspending:
01:09:25 systemd: Starting Suspend...
01:09:24 kernel: nouveau 0000:23:00.0: disp: 0x000061ec[0]:
INIT_GENERIC_CONDITON: unknown 0x07
01:09:24 gnome-software: no app for changed topIcons@adel.gadllah@gmail.com
01:09:24 gnome-shell: Window manager warning: Failed to set power save mode for
output DVI-D-1: Permission denied
01:09:24 NetworkManager: <info>  [1515283764.2068] manager: NetworkManager
state is now ASLEEP
01:09:24 systemd-logind: Suspend key pressed.

There is no log of the attempt to resume.