the drm-intel-nightly kernel didn't fix the issue. I began attempting to trace the issue and search for clues as to why this is happening.
I am attaching three kernel log files with kernel switch: drm.debug=0x05 All of these are kernel logs after a "xset dpms force off". - "success" is with the screen resumed successfully after a few seconds of being suspended - "fail-proper" screen resumed after ~20 seconds, and the issue occurs - "fail-reschg" after about 15 seconds, the computer wakes itself with no user input, external monitors are switched off, and the panel (eDP) drops to 1680x1050 and cannot be set to a higher resolution until a "service lightdm restart" I noticed the existence of errors around "set_hdr_from_dst_qlock" in fail-proper only and came across two patches to drm_dp_mst_topology.c - I applied these four patches and recompiled the kernel module, and the problem still exists. http://www.spinics.net/lists/stable/msg113900.html After this patch it seems like suspending does one of three behaviors: - Wakes itself after 15 seconds with no issues - Wakes itself after 15 seconds and the externals detach, and laptop panel goes to a lower resolution - Doesn't wake, but on user input returns with the two external screens still part of the desktop, but with no video ** Attachment added: "verboselogs.tar.gz" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527829/+attachment/4549545/+files/verboselogs.tar.gz ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1527829 Title: displayport MST external monitors don't return from sleep mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527829/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
