Catching up as I came at this from another direction. Having got a Windows-installed XPS 13 9370 and installed 18.04 freshly on it itself, its default suspend mode is s2idle, which means lots of battery life gets lost while suspended. But no bluetooth problems. See askubuntu: https://askubuntu.com/questions/1029474/ubuntu-18-04-dell-xps13-9370-no- longer-suspends-on-lid-close?newreg=c37c6aa8b9c94d578157bc0835fe0286 for more about that.
But when I applied the working fix for that I encountered the problem described here. I've done some different looking around and found this, a Fedora bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1514836 wherein it looks like they may have fixed it for the XPS 13 9360, and that fix is upstream and I guess will appear in 4.17. However that would need to be amended to take in the 9370 too, as it looks like being the same issue. Currently I'm running the workaround described earlier in that bug report, to use the kernel parameter btusb.enable_autosuspend=n (actually I'm doing it with "options btusb enable_autosuspend=n" in a file in /etc/modprobe.d); but that kernel option only arrived in 4.16 so I'm running the 4.16 mainline kernel to get it. It *appears* to be working, with bluetooth having survived a couple of deep sleeps so far this morning, but I haven't been running it very long to be sure. (Proving a negative blah.) But this is a lesser workaround, as I understand it, telling the bt adapter not to go to sleep during deep sleep, rather than, presumably preferably, letting it sleep but waking it up thoroughly afterwards, which is the suspend-resume fix. I think what we probably want is that fix from Redhat that's in btusb.c in kernel head now, to also be applied to 9370. And then for us to get that kernel! Either presumably when the -hwe kernels start, or Dell can push one out, or anyway in 18.10. ** Bug watch added: Red Hat Bugzilla #1514836 https://bugzilla.redhat.com/show_bug.cgi?id=1514836 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766825 Title: Bluetooth issues with Dell XPS 13 (9370) To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1766825/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
