That dmesg output sounds a lot like bugs 1010916 and 1011168 and a Xeon X3430 CPU would be another older one that predates XSAVE.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1011168#15 -- Jon Doge Wrangler X(7): A program for managing terminal windows. See also screen(1) and tmux(1).
