Aleatory black screen when shutting down or rebooting

laptop - Thinkpad Edge 1141-gjg
pacman -Qm
cmus-git 1:2.5.0.67.gde9e9bd-1
firefox-nightly 28.0a1-1
i3-git 4.6.97.g3dba515-1
llpp-git 1538.4254110-1
package-query-git 1.2.6.g333d94a-1
profile-sync-daemon 5.44-1
st-git 1:20131028.7263820-1
xcb-util-cursor-git 38-1
xf86-video-intel-git 2.99.906.7.g6e9a8c5-1
yaourt-git 1.3.12.ga2a6315-1
laptop-mode-tools enabled,settings not customized
problem: Sometimes when I shut down or reboot the screen goes black nothing happens except the laptop keeps running.I have this problem for some time but I didn't bother taking care of it because I had too much stuff on my mind so I can't pinpoint exactly when it all started.
I use systemctl poweroff/reboot in order to shut down/reboot my laptop.

Why you start two different threads about one and the same theme??
You should follow the first thread:
http://forums.computers.toshiba-europe.com/forums//message.jspa?messageID=122499#122499

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