[Bug 99641] New: External monitor attached to minidisplay port does not work

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=99641

            Bug ID: 99641
           Summary: External monitor attached to minidisplay port does not
                    work
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0.4
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: depasquale.giulio at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 179111
  --> https://bugzilla.kernel.org/attachment.cgi?id=179111&action=edit
xrandr

I attached several monitors to my laptop through a VGA connection successfully.
I can't say that when I attach one to the minidisplay port though. The monitor
just shows a black screen; the only method which actually allows me to see
something on the screen is changing the resolution. Sometimes it works (on
640x480 everything seems ok), sometimes not. Although, the video output is
scrambled with visible graphic glitches (a lot of horizontal green lines) and
vsync problems.

I tested this bug on several distros: Ubuntu 14.04, 14.10, 15.04 and my daily
one, Gentoo.

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