[Bug 99438] New: Dell XPS 15 (9550) External Monitor not waking

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99438

            Bug ID: 99438
           Summary: Dell XPS 15 (9550) External Monitor not waking
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ernstp at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After a longer period of DPMS (haven't tested exactly where the threshold is) I
can no longer wake my external monitor.
The monitor is connected with a HDMI-DVI cable directly to the HDMI port of my 
Dell XPS 15 9550.
The monitor, a HP LA2405x, has a number of settings for source/auto-detect but
none of them help.

Tested with kernel 4.9.3, both with Xorg and Wayland.

I see the same problem here:

http://askubuntu.com/questions/699649/15-10-dell-xps-15-9550-external-monitor-not-waking

and here:

http://en.community.dell.com/support-forums/laptop/f/3519/t/19679539

Note this is with DPMS, doing a full suspend-resume usually fixes the problem.
Another workaround is to unplug the cable and put it back.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170117/7d0eda00/attachment.html>