Maybe this can help?
$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.14.11-300.fc27.x86_64
root=UUID=4aab7630-84b2-4eae-9c5e-804ff8657b7f ro rhgb quiet
nouveau.modeset=0 video=vesa:off LANG=fr_FR.UTF-8
$ dmesg | grep -i failed
[ 0.889614] acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM
[ 5.692362] video: probe of PNP0A08:00 failed with error -22
$ journalctl -b 0 | grep -i failed
janv. 09 08:02:55 vouise kernel: acpi PNP0A08:00: _OSC failed
(AE_ERROR); disabling ASPM
janv. 09 08:02:55 vouise kernel: video: probe of PNP0A08:00 failed
with error -22
janv. 09 08:02:58 vouise rngd[777]: Failed to init entropy source 0:
Hardware RNG Device
janv. 09 08:02:58 vouise rngd[777]: Failed to init entropy source 1:
TPM RNG Device
janv. 09 08:02:58 vouise rngd[777]: Failed to init entropy source 2:
Intel RDRAND Instruction RNG
janv. 09 08:02:58 vouise avahi-daemon[802]: chroot.c: open() failed:
No such file or directory
janv. 09 08:02:58 vouise avahi-daemon[780]: Failed to open
/etc/resolv.conf: Invalid argument
janv. 09 08:02:58 vouise systemd[1]: rngd.service: Unit entered failed state.
janv. 09 08:02:58 vouise audit[1]: SERVICE_STOP pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=rngd comm="systemd" exe="/usr/lib/systemd/systemd"
hostname=? addr=? terminal=? res=failed'
janv. 09 08:02:58 vouise systemd[1]: rngd.service: Failed with result
'exit-code'.
janv. 09 08:03:02 vouise sddm-greeter[1102]:
inotify_add_watch("/etc/fstab") failed: "Permission denied"
janv. 09 08:03:35 vouise audit[1241]: USER_AUTH pid=1241 uid=0
auid=4294967295 ses=4294967295
subj=system_u:system_r:sshd_t:s0-s0:c0.c1023 msg='op=pubkey_auth
rport=59428 acct="fred" exe="/usr/sbin/sshd" hostname=?
addr=192.168.1.61 terminal=? res=failed'
janv. 09 08:03:35 vouise audit[1241]: USER_AUTH pid=1241 uid=0
auid=4294967295 ses=4294967295
subj=system_u:system_r:sshd_t:s0-s0:c0.c1023 msg='op=key algo=ssh-rsa
size=2048
fp=SHA256:c5:70:41:1d:bb:ce:b8:70:60:69:ce:dc:a0:f6:c3:7c:33:be:93:66:fe:26:79:e0:6a:79:89:fd:ce:92:32:57
rport=59428 acct="fred" exe="/usr/sbin/sshd" hostname=?
addr=192.168.1.61 terminal=? res=failed'
I found that in /var/log/Xorg.0.log:
[ 9.255] > ABI class: X.Org Video Driver, version 23.0
[ 9.255] (II) LoadModule: "nv"
[ 9.255] (WW) Warning, couldn't open module nv
[ 9.255] (II) UnloadModule: "nv"
[ 9.255] (II) Unloading nv
[ 9.255] (EE) Failed to load module "nv" (module does not exist, 0)
[ 9.257] (II) NOUVEAU driver~
[ 9.257] (II) NOUVEAU driver for NVIDIA chipset families :
...
[ 9.257] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 9.257] (II) FBDEV: driver for framebuffer: fbdev
[ 9.257] (II) VESA: driver for VESA chipsets: vesa
[ 9.392] (EE) [drm] Failed to open DRM device for pci:0000:01:00.0: -19
[ 9.392] (EE) open /dev/dri/card0: No such file or directory
[ 9.392] (WW) Falling back to old probe method for modesetting
[ 9.392] (EE) open /dev/dri/card0: No such file or directory
[ 9.392] (II) Loading sub module "fbdevhw"
[ 9.392] (II) LoadModule: "fbdevhw"
[ 9.392] (II) Loading /usr/lib64/xorg/modules/libfbdevhw.so
[ 9.393] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 9.393] > compiled for 1.19.5, module version = 0.0.2
[ 9.393] > ABI class: X.Org Video Driver, version 23.0
[ 9.393] (EE) open /dev/fb0: No such file or directory
[ 9.393] (WW) Falling back to old probe method for fbdev
[ 9.393] (II) Loading sub module "fbdevhw"
[ 9.393] (II) LoadModule: "fbdevhw"
[ 9.393] (II) Loading /usr/lib64/xorg/modules/libfbdevhw.so
[ 9.393] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 9.393] > compiled for 1.19.5, module version = 0.0.2
[ 9.393] > ABI class: X.Org Video Driver, version 23.0
[ 9.393] (EE) open /dev/fb0: No such file or directory
[ 9.393] (EE) Screen 0 deleted because of no matching config section.
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