just try latest vivid distro kernel from proposed, which switches Broadwell to use i915_bpo module (backported from 4.2)
you're probably seeing a GPU hang which is known to happen with 3.19 and one of the reasons for the switch, dmesg should confirm that. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1486036 Title: Faulty graphics behaviour when resuming from suspend with intel graphics drivers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1486036/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
