Before reporting upstream I tested some further. Narrowed it down a little bit: The issue only happens when displayport is connected to Dell U2415 (wether or not connected to an extra monitor (vga)). When connected to displayport only on Dell U2412M the issue does not appear. So the issue is related to U2415 with displayport, or a DP v1.2 capable monitor. U2412M is only DP v1.1 capable. Still no workaround. Daisy chaining is not posible because the graphics card is only DP v1.1 capable. I will report upstream now.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1515776 Title: 1002:68a0 After suspend-resume graphics are sluggish and input lags with displayport connected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1515776/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
