this is just a reminder that the problem is still present with the latest ubuntu kernel 3.16.0-29-generic.
bisecting is not completely obvious to me, so I didn't have the time to look into it yet. I just tested the precompiled kernels available in https://launchpad.net/ubuntu/trusty/+source/linux and noticed that the problem started to happen strictly after 3.13.0-16.36 ** Changed in: linux (Ubuntu) Status: Expired => In Progress ** Changed in: linux (Ubuntu) Status: In Progress => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1322644 Title: [Dell XPS 13 (L321X)] External monitor does not wake up after sleep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1322644/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs