[Bug 97531] New: [Broadwell] Second external monitor of MST setup does not turn on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97531

            Bug ID: 97531
           Summary: [Broadwell] Second external monitor of MST setup does
                    not turn on
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: darkbasic at linuxsystems.it
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi,
I reported a bug upstream @Plasma (https://bugs.kde.org/show_bug.cgi?id=365455)
and KDE developers discovered the issue is in the Intel driver: the modesetting
fails on the screen and that's why it goes off. I can trigger switching the
display on by going through a dpms cycle. I have the very same issue with
modesetting and with kernels from 4.4 to 4.7, so I'm not sure where the problem
may be. In the linked bug report you can find logs and much more informations,
including some videos.
Please let me know if you need anything else, I'm at your disposal.

Thanks,
Niccolò

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