According to https://wiki.ubuntu.com/Bugs/FindRightPackage#Suspend_and_Hibernate, refiling this report against the kernel is the way to go for now.
** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1567893 Title: System hangs on second time S3 sleep attempt Status in linux package in Ubuntu: New Bug description: Board Information: Manufacturer: Gigabyte Technology Co., Ltd. Product Name: X79S-UP5 memory: 4GB ASIC: Tonga OS: Ubuntu 16.04 beta2 Display: Dell 30" STEPS TO REPRODUCE: 1) install clean OS 2) Set system to sleep via OS or pm-suspend 3) Wake up system 4) Set system to sleep via OS or pm-suspend EXPECTED: - System goes into S3 sleep again ACTUAL: - Display goes black and system hangs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1567893/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp