Looks like it's the Intel i915 kernel module crashing. So that's the 'linux' kernel package.
** Package changed: xorg (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1646253 Title: I am getting frequent DRM hangs while playing Cities: Skylines from Steam To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1646253/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

