grep WW Xorg.0.log
[  6357.578] (WW) xf86CloseConsole: VT_ACTIVATE failed: Input/output error
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    47.212] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/100dpi/".
[    47.212] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/75dpi/".
[    47.237] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[    47.385] (WW) Warning, couldn't open module nv
[    47.393] (WW) Warning, couldn't open module fbdev
[    47.393] (WW) Warning, couldn't open module vesa
[    47.394] (WW) Falling back to old probe method for modesetting
[    47.395] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[  6357.578] (WW) xf86CloseConsole: KDSETMODE failed: Input/output error
[  6357.578] (WW) xf86CloseConsole: VT_GETMODE failed: Input/output error
[  6357.578] (WW) xf86CloseConsole: VT_ACTIVATE failed: Input/output error


grep EE Xorg.1.log
[    47.080] Current Operating System: Linux parabola 4.10.1-gnu-1 #1 SMP PREEMPT Mon Feb 27 17:40:02 UYT 2017 x86_64
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    47.385] (EE) Failed to load module "nv" (module does not exist, 0)
[    47.393] (EE) Failed to load module "fbdev" (module does not exist, 0)
[    47.393] (EE) Failed to load module "vesa" (module does not exist, 0)
[    47.580] (EE) NOUVEAU(0): [COPY] failed to allocate class.
[  6357.259] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.284] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.309] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.346] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.366] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.379] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.393] (EE) systemd-logind: failed to release device: Connection is closed
[  6357.578] (EE) systemd-logind: ReleaseControl failed: Connection is closed

tail -n 10000 /var/log/messages | grep WARNING -m 5 -n

223:Jan  3 15:14:42 localhost avahi-daemon[326]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
691:Feb  4 10:27:09 localhost avahi-daemon[326]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
1694:Feb  4 11:07:13 localhost avahi-daemon[324]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
2626:Feb  4 11:12:58 localhost avahi-daemon[326]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!
3364:Feb  4 17:58:05 localhost avahi-daemon[326]: WARNING: No NSS support for mDNS detected, consider installing nss-mdns!

tail -n 10000 /var/log/messages | grep ERROR -m 5 -n

1225:Feb  4 10:33:46 localhost ntpd[321]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized
3909:Feb  4 18:07:39 localhost ntpd[322]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized
6121:Mar 14 15:51:34 localhost ntpd[320]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized
6916:Mar 15 16:17:38 localhost ntpd[318]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized
7687:Mar 16 13:29:37 localhost ntpd[319]: kernel reports TIME_ERROR: 0x41: Clock Unsynchronized


some other old errors

Dec  5 21:09:54 localhost gnome-session-binary[443]: WARNING: Could not parse desktop file xscreensaver.desktop or it references a not found TryExec binary
Dec  5 21:09:55 localhost gnome-keyring-daemon[475]: couldn't access control socket: /run/user/0/keyring/control: No such file or directory
Dec  5 21:09:55 localhost gnome-keyring-daemon[476]: couldn't access control socket: /run/user/0/keyring/control: No such file or directory
Dec  5 21:09:55 localhost gnome-keyring-daemon[477]: couldn't access control socket: /run/user/0/keyring/control: No such file or directory