Indeed i can second the VT switch comment. I can trigger the hang with a: sudo chvt 1 sudo chvt 7
Linux htpc 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:15 UTC 2016 i686 i686 i686 GNU/Linux On Ubuntu 16.04
Indeed i can second the VT switch comment. I can trigger the hang with a:
sudo chvt 1
sudo chvt 7
Linux htpc 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:15 UTC 2016 i686 i686 i686 GNU/Linux
On Ubuntu 16.04