[Bug 97558] New: [Broadwell] VGA projection system not detected as of Linux 4.7 (but fine before then)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97558

            Bug ID: 97558
           Summary: [Broadwell] VGA projection system not detected as of
                    Linux 4.7 (but fine before then)
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: inform at tiker.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hi there,

as of Linux 4.7 (tried -rc7 and 4.7.2), my ThinkPad X250 (i7-500U) will no
longer recognize the projection system in a large lecture hall at my work when
plugged in through the VGA port (which is the only option). There is no display
detected on the VGA port when I type "xrandr".

Using kernel 4.6 (and, as far as I can tell, all kernels before that), there is
no issue. The display is detected and activated as expected.

Kernel 4.7 *will* properly detect and talk to a Dell LCD monitor through the
VGA port, so the basic functionality is working.

I am using Debian with the "modesetting" DDX I believe.

More detailed info:
https://gist.github.com/inducer/12d4507f454c27319e5585629d9727a5

I would much appreciate any help you can provide.

Thanks!

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