After I suspend, tty[1-6] always have no signal and I do not know why.
Here is dmesg http://pastebin.com/h9jpksHw.
uname - Linux host 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1+deb8u6 (2015-11-09) x86_64 GNU/Linux
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